diff --git a/docs/api/format.md b/docs/api/format.md
index c7be7ea..5a31059 100644
--- a/docs/api/format.md
+++ b/docs/api/format.md
@@ -134,24 +134,33 @@ For a complete list of all supported locales with import examples, see [Supporte
 
 ### timeZone
 
-**Type**: `TimeZone | "UTC"`  
+**Type**: `TimeZone | string`
 **Default**: `undefined` (local timezone)
 
-Converts the date to the specified timezone before formatting.
+Converts the date to the specified timezone before formatting. You can specify a timezone in three ways:
 
 ```typescript
 import { format } from 'date-and-time';
+
+// Method 1: Individual timezone import
 import Tokyo from 'date-and-time/timezones/Asia/Tokyo';
 import New_York from 'date-and-time/timezones/America/New_York';
 
+// Method 2: Consolidated timezone import
+import { Tokyo as TokyoTZ, New_York as NY } from 'date-and-time/timezone';
+
 const date = new Date();
 
-// Format in Tokyo timezone
+// Using TimeZone object (individual import)
 format(date, 'YYYY-MM-DD HH:mm:ss [JST]', { timeZone: Tokyo });
 // => 2025-08-23 23:30:45 JST
 
-// Format in New York timezone  
-format(date, 'YYYY-MM-DD HH:mm:ss [EST]', { timeZone: New_York });
+// Using TimeZone object (consolidated import)
+format(date, 'YYYY-MM-DD HH:mm:ss [EST]', { timeZone: NY });
+// => 2025-08-23 09:30:45 EST
+
+// Using IANA timezone name string (format only)
+format(date, 'YYYY-MM-DD HH:mm:ss [EST]', { timeZone: 'America/New_York' });
 // => 2025-08-23 09:30:45 EST
 
 // Format in UTC
@@ -314,16 +323,35 @@ format(date, '\\[YYYY-MM-DD HH:mm:ss\\]');
 ```typescript
 import { format } from 'date-and-time';
 import ja from 'date-and-time/locales/ja';
+
+// Method 1: Individual timezone import
 import Tokyo from 'date-and-time/timezones/Asia/Tokyo';
 
+// Method 2: Consolidated timezone import (alternative)
+import { Tokyo as TokyoTZ } from 'date-and-time/timezone';
+
 const date = new Date();
 
-// Japanese with timezone
+// Japanese with timezone (using individual import)
 format(date, 'YYYY年MMMM月D日dddd Ah:mm:ss [GMT]Z', {
   timeZone: Tokyo,
   locale: ja
 });
 // => 2025年8月23日土曜日 午後11:30:45 GMT+0900
+
+// Or using consolidated import
+format(date, 'YYYY年MMMM月D日dddd Ah:mm:ss [GMT]Z', {
+  timeZone: TokyoTZ,
+  locale: ja
+});
+// => 2025年8月23日土曜日 午後11:30:45 GMT+0900
+
+// Or using IANA timezone name string
+format(date, 'YYYY年MMMM月D日dddd Ah:mm:ss [GMT]Z', {
+  timeZone: 'Asia/Tokyo',
+  locale: ja
+});
+// => 2025年8月23日土曜日 午後11:30:45 GMT+0900
 ```
 
 ### Business and Technical Formats
@@ -342,7 +370,7 @@ format(date, 'ddd, DD MMM YYYY HH:mm:ss ZZ');
 // => Sat, 23 Aug 2025 14:30:45 +09:00
 
 // Log timestamp
-format(date, '[YYYY-MM-DD HH:mm:ss.SSS]');
+format(date, '\\[YYYY-MM-DD HH:mm:ss.SSS]\\');
 // => [2025-08-23 14:30:45.123]
 
 // File naming
diff --git a/docs/api/parse.md b/docs/api/parse.md
index 976516e..76f519c 100644
--- a/docs/api/parse.md
+++ b/docs/api/parse.md
@@ -170,6 +170,10 @@ parse('2025-08-23T14:30:00 +05:00', 'YYYY-MM-DD[T]HH:mm:ss ZZ', { timeZone: New_
 // => Fri Aug 23 2025 14:30:00 GMT+0500 (New_York timeZone is ignored)
 ```
 
+:::warning Important Difference from format()
+The `parse()` function only accepts TimeZone objects and the "UTC" string for the `timeZone` option. Unlike `format()`, which supports both TimeZone objects and IANA timezone name strings, `parse()` does not support string type timezone names.
+:::
+
 For a complete list of all supported timezones with import examples, see [Supported Timezones](../timezones).
 
 ### numeral
diff --git a/docs/guide/quick-start.md b/docs/guide/quick-start.md
index 3d6eb80..74540bb 100644
--- a/docs/guide/quick-start.md
+++ b/docs/guide/quick-start.md
@@ -83,23 +83,47 @@ For a complete list of all supported locales with import examples, see [Supporte
 
 ```typescript
 import { format, parse } from 'date-and-time';
+
+// Method 1: Individual timezone imports
 import Tokyo from 'date-and-time/timezones/Asia/Tokyo';
 import New_York from 'date-and-time/timezones/America/New_York';
 
+// Method 2: Consolidated timezone imports (alternative)
+import { Los_Angeles, London } from 'date-and-time/timezone';
+
 const date = new Date();
 
-// Format in different timezones
+// Using TimeZone objects (Method 1 - individual import)
 format(date, 'YYYY-MM-DD HH:mm:ss [JST]', { timeZone: Tokyo });
 // => 2025-08-23 23:30:45 JST
 
-format(date, 'YYYY-MM-DD HH:mm:ss [EST]', { timeZone: New_York });
+// Using TimeZone objects (Method 2 - consolidated import)
+format(date, 'YYYY-MM-DD HH:mm:ss [PST]', { timeZone: Los_Angeles });
+// => 2025-08-23 06:30:45 PST
+
+// Using IANA timezone name strings (simplest approach)
+format(date, 'YYYY-MM-DD HH:mm:ss [EST]', { timeZone: 'America/New_York' });
 // => 2025-08-23 09:30:45 EST
 
 // UTC formatting
 format(date, 'YYYY-MM-DD HH:mm:ss [UTC]', { timeZone: 'UTC' });
 // => 2025-08-23 14:30:45 UTC
+
+// Parsing in timezone (TimeZone objects only)
+parse('2025-08-23 23:30:45', 'YYYY-MM-DD HH:mm:ss', { timeZone: Tokyo });
+// => Fri Aug 23 2025 23:30:45 GMT+0900
 ```
 
+### Three Ways to Specify Timezones
+
+The `format()` function supports three methods for specifying timezones:
+
+1. **TimeZone objects via individual imports** - Type-safe but requires multiple import statements
+2. **TimeZone objects via consolidated imports** - Type-safe with better code organization
+3. **IANA timezone name strings** - Simplest approach, no imports needed for timezone modules
+
+The `parse()` function only supports TimeZone objects and the "UTC" string for timezone specification.
+
 For a complete list of all supported timezones with import examples, see [Supported Timezones](../timezones).
 
 ## Date Arithmetic
diff --git a/docs/index.md b/docs/index.md
index 17ce380..b6133dc 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -50,7 +50,7 @@ features:
 ```typescript
 import { format, parse, addDays } from 'date-and-time';
 import ja from 'date-and-time/locales/ja';
-import Tokyo from 'date-and-time/timezones/Asia/Tokyo';
+import { Tokyo } from 'date-and-time/timezone';
 
 const now = new Date();
 
@@ -62,10 +62,14 @@ format(now, 'YYYY/MM/DD HH:mm:ss');
 format(now, 'YYYY年M月D日(ddd)', { locale: ja });
 // => 2025年8月23日(金)
 
-// Timezone-aware formatting
+// Timezone-aware formatting (using TimeZone object)
 format(now, 'YYYY-MM-DD HH:mm:ss [JST]', { timeZone: Tokyo });
 // => 2025-08-23 23:30:45 JST
 
+// Timezone-aware formatting (using IANA timezone name string)
+format(now, 'YYYY-MM-DD HH:mm:ss [EST]', { timeZone: 'America/New_York' });
+// => 2025-08-23 09:30:45 EST
+
 // Parsing
 const date = parse('2025/08/23 14:30:45', 'YYYY/MM/DD HH:mm:ss');
 console.log(date)
diff --git a/docs/migration.md b/docs/migration.md
index 72c4384..da33e4f 100644
--- a/docs/migration.md
+++ b/docs/migration.md
@@ -37,7 +37,7 @@ format(new Date(), 'ddd, MMM DD YYYY hh:mm A [GMT]Z', { timeZone: 'UTC' });
 // => Fri, Jan 02 2015 07:14 AM GMT+0000
 ```
 
-Additionally, since the `timezone` plugin has been integrated into the main library, the `formatTZ` function is now obsolete. Timezones are now imported as modules rather than using `IANA time zone names` (except for UTC timezone).
+Additionally, since the `timezone` plugin has been integrated into the main library, the `formatTZ` function is now obsolete. In v4.0/4.1, timezones must be imported as TimeZone objects from timezone modules. IANA timezone name strings are not supported in this version (except for UTC timezone).
 
 ```typescript
 import { format } from 'date-and-time';
@@ -47,6 +47,57 @@ format(now, 'dddd, MMMM D, YYYY [at] H:mm:ss.SSS [GMT]ZZ', { timeZone: New_York
 // => Wednesday, July 23, 2025 at 3:28:27.443 GMT-04:00
 ```
 
+#### New in v4.2.0: Enhanced Timezone Support
+
+In addition to TimeZone objects, the `format()` function now supports specifying timezones using IANA timezone name strings. This provides flexibility in how you work with timezones:
+
+```typescript
+import { format } from 'date-and-time';
+
+const now = new Date();
+
+// Using IANA timezone name string (simplest)
+format(now, 'YYYY-MM-DD HH:mm:ss [EST]', { timeZone: 'America/New_York' });
+// => 2025-08-23 09:30:45 EST
+
+// Using TimeZone object (recommended for type safety)
+import New_York from 'date-and-time/timezones/America/New_York';
+format(now, 'YYYY-MM-DD HH:mm:ss [EST]', { timeZone: New_York });
+// => 2025-08-23 09:30:45 EST
+
+// Using consolidated import (recommended for multiple timezones)
+import { New_York as NY } from 'date-and-time/timezone';
+format(now, 'YYYY-MM-DD HH:mm:ss [EST]', { timeZone: NY });
+// => 2025-08-23 09:30:45 EST
+```
+
+**Note**: The `parse()` function does not support string type timezone names. Only TimeZone objects and the "UTC" string are supported for parsing.
+
+##### Consolidated Import
+
+For better code organization when working with multiple timezones, you can import all timezones from a single `date-and-time/timezone` module:
+
+```typescript
+// Consolidated import (recommended for multiple timezones)
+import { Tokyo, New_York, London, Sydney } from 'date-and-time/timezone';
+
+const now = new Date();
+
+format(now, 'YYYY-MM-DD HH:mm', { timeZone: Tokyo });    // JST
+format(now, 'YYYY-MM-DD HH:mm', { timeZone: New_York }); // EST/EDT
+format(now, 'YYYY-MM-DD HH:mm', { timeZone: London });   // GMT/BST
+format(now, 'YYYY-MM-DD HH:mm', { timeZone: Sydney });   // AEDT/AEST
+```
+
+Alternatively, you can still import individual timezone modules directly:
+
+```typescript
+import Tokyo from 'date-and-time/timezones/Asia/Tokyo';
+import New_York from 'date-and-time/timezones/America/New_York';
+import London from 'date-and-time/timezones/Europe/London';
+import Sydney from 'date-and-time/timezones/Australia/Sydney';
+```
+
 ### parse
 
 The third argument has been changed from `boolean` to `ParserOptions`. With `ParserOptions`, you can now specify timezone and locale settings. If you previously set the third argument to `true` to parse input in UTC timezone, you can achieve the same output as follows:
diff --git a/docs/timezones.md b/docs/timezones.md
index e9a49bc..6ec5fc9 100644
--- a/docs/timezones.md
+++ b/docs/timezones.md
@@ -1,5 +1,67 @@
 # Supported Timezones
 
+## Import Methods
+
+There are three ways to import and use timezones with the date-and-time library:
+
+### Method 1: Individual Import
+
+Import each timezone you need directly from its module path. This approach is useful when you only need a few specific timezones.
+
+```typescript
+import { format } from 'date-and-time';
+import Tokyo from 'date-and-time/timezones/Asia/Tokyo';
+import New_York from 'date-and-time/timezones/America/New_York';
+
+const date = new Date();
+
+format(date, 'YYYY-MM-DD HH:mm:ss', { timeZone: Tokyo });
+// => 2025-08-23 23:30:45
+
+format(date, 'YYYY-MM-DD HH:mm:ss', { timeZone: New_York });
+// => 2025-08-23 09:30:45
+```
+
+### Method 2: Consolidated Import
+
+Import multiple timezones from a single module using named imports. This approach is recommended when working with multiple timezones as it provides better code organization.
+
+```typescript
+import { format } from 'date-and-time';
+import { Tokyo, New_York, London, Sydney } from 'date-and-time/timezone';
+
+const date = new Date();
+
+format(date, 'YYYY-MM-DD HH:mm:ss', { timeZone: Tokyo });    // JST
+format(date, 'YYYY-MM-DD HH:mm:ss', { timeZone: New_York }); // EST/EDT
+format(date, 'YYYY-MM-DD HH:mm:ss', { timeZone: London });   // GMT/BST
+format(date, 'YYYY-MM-DD HH:mm:ss', { timeZone: Sydney });   // AEDT/AEST
+```
+
+Both Method 1 and Method 2 provide the same functionality - they differ only in code organization.
+
+### Method 3: IANA Timezone Name String
+
+Functions that accept `FormatterOptions` (such as `format()` and `transform()`) allow you to specify timezones using IANA timezone name strings directly. This is the simplest approach.
+
+```typescript
+import { format } from 'date-and-time';
+
+const date = new Date();
+
+// Using IANA timezone name strings
+format(date, 'YYYY-MM-DD HH:mm:ss', { timeZone: 'Asia/Tokyo' });
+// => 2025-08-23 23:30:45
+
+format(date, 'YYYY-MM-DD HH:mm:ss', { timeZone: 'America/New_York' });
+// => 2025-08-23 09:30:45
+
+format(date, 'YYYY-MM-DD HH:mm:ss', { timeZone: 'Europe/London' });
+// => 2025-08-23 14:30:45
+```
+
+**Important Note**: The `parse()` function does not support string type timezone names because it uses `ParserOptions` instead of `FormatterOptions`. Only TimeZone objects and the "UTC" string are supported for parsing.
+
 ## Regions
 
 1. [Africa](#africa)
diff --git a/package-lock.json b/package-lock.json
index 8a552cf..b505114 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,30 +1,29 @@
 {
   "name": "date-and-time",
-  "version": "4.1.2",
+  "version": "4.2.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "date-and-time",
-      "version": "4.1.2",
+      "version": "4.2.0",
       "license": "MIT",
       "devDependencies": {
-        "@eslint/js": "^9.39.2",
         "@rollup/plugin-alias": "^6.0.0",
         "@rollup/plugin-terser": "^0.4.4",
-        "@stylistic/eslint-plugin": "^5.6.1",
-        "@types/node": "^25.0.2",
-        "@vitest/coverage-v8": "^4.0.15",
+        "@stylistic/eslint-plugin": "^5.7.0",
+        "@types/node": "^25.0.9",
+        "@vitest/coverage-v8": "^4.0.17",
         "eslint": "^9.39.2",
         "glob": "^13.0.0",
-        "prettier": "^3.7.4",
-        "rollup": "^4.53.3",
+        "prettier": "^3.8.0",
+        "rollup": "^4.55.1",
         "rollup-plugin-dts": "^6.3.0",
         "rollup-plugin-esbuild": "^6.2.1",
         "tsx": "^4.21.0",
-        "typescript-eslint": "^8.49.0",
+        "typescript-eslint": "^8.53.0",
         "vitepress": "^1.6.4",
-        "vitest": "^4.0.15"
+        "vitest": "^4.0.17"
       },
       "engines": {
         "node": ">=18"
@@ -818,7 +817,9 @@
       }
     },
     "node_modules/@eslint-community/eslint-utils": {
-      "version": "4.9.0",
+      "version": "4.9.1",
+      "resolved": "https://registry.npmjs.org/@eslint-community/eslint-utils/-/eslint-utils-4.9.1.tgz",
+      "integrity": "sha512-phrYmNiYppR7znFEdqgfWHXR6NCkZEK7hwWDHZUjit/2/U0r6XvkDl0SYnoM51Hq7FhCGdLDT6zxCCOY1hexsQ==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
@@ -846,7 +847,9 @@
       }
     },
     "node_modules/@eslint-community/regexpp": {
-      "version": "4.12.1",
+      "version": "4.12.2",
+      "resolved": "https://registry.npmjs.org/@eslint-community/regexpp/-/regexpp-4.12.2.tgz",
+      "integrity": "sha512-EriSTlt5OC9/7SXkRSCAhfSxxoSUgBm33OH+IkwbdpgoqsSsUg7y3uh+IICI/Qg4BBWr3U2i39RpmycbxMq4ew==",
       "dev": true,
       "license": "MIT",
       "engines": {
@@ -1134,9 +1137,9 @@
       }
     },
     "node_modules/@rollup/rollup-android-arm-eabi": {
-      "version": "4.53.3",
-      "resolved": "https://registry.npmjs.org/@rollup/rollup-android-arm-eabi/-/rollup-android-arm-eabi-4.53.3.tgz",
-      "integrity": "sha512-mRSi+4cBjrRLoaal2PnqH82Wqyb+d3HsPUN/W+WslCXsZsyHa9ZeQQX/pQsZaVIWDkPcpV6jJ+3KLbTbgnwv8w==",
+      "version": "4.55.1",
+      "resolved": "https://registry.npmjs.org/@rollup/rollup-android-arm-eabi/-/rollup-android-arm-eabi-4.55.1.tgz",
+      "integrity": "sha512-9R0DM/ykwfGIlNu6+2U09ga0WXeZ9MRC2Ter8jnz8415VbuIykVuc6bhdrbORFZANDmTDvq26mJrEVTl8TdnDg==",
       "cpu": [
         "arm"
       ],
@@ -1148,9 +1151,9 @@
       ]
     },
     "node_modules/@rollup/rollup-android-arm64": {
-      "version": "4.53.3",
-      "resolved": "https://registry.npmjs.org/@rollup/rollup-android-arm64/-/rollup-android-arm64-4.53.3.tgz",
-      "integrity": "sha512-CbDGaMpdE9sh7sCmTrTUyllhrg65t6SwhjlMJsLr+J8YjFuPmCEjbBSx4Z/e4SmDyH3aB5hGaJUP2ltV/vcs4w==",
+      "version": "4.55.1",
+      "resolved": "https://registry.npmjs.org/@rollup/rollup-android-arm64/-/rollup-android-arm64-4.55.1.tgz",
+      "integrity": "sha512-eFZCb1YUqhTysgW3sj/55du5cG57S7UTNtdMjCW7LwVcj3dTTcowCsC8p7uBdzKsZYa8J7IDE8lhMI+HX1vQvg==",
       "cpu": [
         "arm64"
       ],
@@ -1162,9 +1165,9 @@
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     },
     "node_modules/@rollup/rollup-darwin-arm64": {
-      "version": "4.53.3",
-      "resolved": "https://registry.npmjs.org/@rollup/rollup-darwin-arm64/-/rollup-darwin-arm64-4.53.3.tgz",
-      "integrity": "sha512-Nr7SlQeqIBpOV6BHHGZgYBuSdanCXuw09hon14MGOLGmXAFYjx1wNvquVPmpZnl0tLjg25dEdr4IQ6GgyToCUA==",
+      "version": "4.55.1",
+      "resolved": "https://registry.npmjs.org/@rollup/rollup-darwin-arm64/-/rollup-darwin-arm64-4.55.1.tgz",
+      "integrity": "sha512-p3grE2PHcQm2e8PSGZdzIhCKbMCw/xi9XvMPErPhwO17vxtvCN5FEA2mSLgmKlCjHGMQTP6phuQTYWUnKewwGg==",
       "cpu": [
         "arm64"
       ],
@@ -1176,9 +1179,9 @@
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     "node_modules/@rollup/rollup-darwin-x64": {
-      "version": "4.53.3",
-      "resolved": "https://registry.npmjs.org/@rollup/rollup-darwin-x64/-/rollup-darwin-x64-4.53.3.tgz",
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+      "version": "4.55.1",
+      "resolved": "https://registry.npmjs.org/@rollup/rollup-darwin-x64/-/rollup-darwin-x64-4.55.1.tgz",
+      "integrity": "sha512-rDUjG25C9qoTm+e02Esi+aqTKSBYwVTaoS1wxcN47/Luqef57Vgp96xNANwt5npq9GDxsH7kXxNkJVEsWEOEaQ==",
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@@ -1190,9 +1193,9 @@
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-      "version": "4.53.3",
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+      "version": "4.55.1",
+      "resolved": "https://registry.npmjs.org/@rollup/rollup-freebsd-arm64/-/rollup-freebsd-arm64-4.55.1.tgz",
+      "integrity": "sha512-+JiU7Jbp5cdxekIgdte0jfcu5oqw4GCKr6i3PJTlXTCU5H5Fvtkpbs4XJHRmWNXF+hKmn4v7ogI5OQPaupJgOg==",
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       ],
@@ -1204,9 +1207,9 @@
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+      "version": "4.55.1",
+      "resolved": "https://registry.npmjs.org/@rollup/rollup-freebsd-x64/-/rollup-freebsd-x64-4.55.1.tgz",
+      "integrity": "sha512-V5xC1tOVWtLLmr3YUk2f6EJK4qksksOYiz/TCsFHu/R+woubcLWdC9nZQmwjOAbmExBIVKsm1/wKmEy4z4u4Bw==",
       "cpu": [
         "x64"
       ],
@@ -1218,9 +1221,9 @@
       ]
     },
     "node_modules/@rollup/rollup-linux-arm-gnueabihf": {
-      "version": "4.53.3",
-      "resolved": "https://registry.npmjs.org/@rollup/rollup-linux-arm-gnueabihf/-/rollup-linux-arm-gnueabihf-4.53.3.tgz",
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+      "version": "4.55.1",
+      "resolved": "https://registry.npmjs.org/@rollup/rollup-linux-arm-gnueabihf/-/rollup-linux-arm-gnueabihf-4.55.1.tgz",
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       "cpu": [
         "arm"
       ],
@@ -1232,9 +1235,9 @@
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     },
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       "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/estree-walker/-/estree-walker-3.0.3.tgz",
+      "integrity": "sha512-7RUKfXgSMMkzt6ZuXmqapOurLGPPfgj6l9uRZ7lRGolvk0y2yocc35LdcxKC5PQZdn2DMqioAQ2NoWcrTKmm6g==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
@@ -2758,9 +2837,9 @@
       }
     },
     "node_modules/expect-type": {
-      "version": "1.2.2",
-      "resolved": "https://registry.npmjs.org/expect-type/-/expect-type-1.2.2.tgz",
-      "integrity": "sha512-JhFGDVJ7tmDJItKhYgJCGLOWjuK9vPxiXoUFLwLDc99NlmklilbiQJwoctZtt13+xMw91MCk/REan6MWHqDjyA==",
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/expect-type/-/expect-type-1.3.0.tgz",
+      "integrity": "sha512-knvyeauYhqjOYvQ66MznSMs83wmHrCycNEN6Ao+2AeYEfxUIkuiVxdEa1qlGEPK+We3n0THiDciYSsCcgW/DoA==",
       "dev": true,
       "license": "Apache-2.0",
       "engines": {
@@ -3067,19 +3146,6 @@
         "node": ">=10"
       }
     },
-    "node_modules/istanbul-lib-source-maps": {
-      "version": "5.0.6",
-      "dev": true,
-      "license": "BSD-3-Clause",
-      "dependencies": {
-        "@jridgewell/trace-mapping": "^0.3.23",
-        "debug": "^4.1.1",
-        "istanbul-lib-coverage": "^3.0.0"
-      },
-      "engines": {
-        "node": ">=10"
-      }
-    },
     "node_modules/istanbul-reports": {
       "version": "3.2.0",
       "dev": true,
@@ -3094,6 +3160,8 @@
     },
     "node_modules/js-tokens": {
       "version": "9.0.1",
+      "resolved": "https://registry.npmjs.org/js-tokens/-/js-tokens-9.0.1.tgz",
+      "integrity": "sha512-mxa9E9ITFOt0ban3j6L5MpjwegGz6lBQmM1IJkWeBZGcMxto50+eWdjC/52xDbS2vy0k7vIMK0Fe2wfL9OQSpQ==",
       "dev": true,
       "license": "MIT"
     },
@@ -3555,9 +3623,9 @@
       }
     },
     "node_modules/prettier": {
-      "version": "3.7.4",
-      "resolved": "https://registry.npmjs.org/prettier/-/prettier-3.7.4.tgz",
-      "integrity": "sha512-v6UNi1+3hSlVvv8fSaoUbggEM5VErKmmpGA7Pl3HF8V6uKY7rvClBOJlH6yNwQtfTueNkGVpOv/mtWL9L4bgRA==",
+      "version": "3.8.0",
+      "resolved": "https://registry.npmjs.org/prettier/-/prettier-3.8.0.tgz",
+      "integrity": "sha512-yEPsovQfpxYfgWNhCfECjG5AQaO+K3dp6XERmOepyPDVqcJm+bjyCVO3pmU+nAPe0N5dDvekfGezt/EIiRe1TA==",
       "dev": true,
       "license": "MIT",
       "bin": {
@@ -3638,9 +3706,9 @@
       "license": "MIT"
     },
     "node_modules/rollup": {
-      "version": "4.53.3",
-      "resolved": "https://registry.npmjs.org/rollup/-/rollup-4.53.3.tgz",
-      "integrity": "sha512-w8GmOxZfBmKknvdXU1sdM9NHcoQejwF/4mNgj2JuEEdRaHwwF12K7e9eXn1nLZ07ad+du76mkVsyeb2rKGllsA==",
+      "version": "4.55.1",
+      "resolved": "https://registry.npmjs.org/rollup/-/rollup-4.55.1.tgz",
+      "integrity": "sha512-wDv/Ht1BNHB4upNbK74s9usvl7hObDnvVzknxqY/E/O3X6rW1U1rV1aENEfJ54eFZDTNo7zv1f5N4edCluH7+A==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
@@ -3654,28 +3722,31 @@
         "npm": ">=8.0.0"
       },
       "optionalDependencies": {
-        "@rollup/rollup-android-arm-eabi": "4.53.3",
-        "@rollup/rollup-android-arm64": "4.53.3",
-        "@rollup/rollup-darwin-arm64": "4.53.3",
-        "@rollup/rollup-darwin-x64": "4.53.3",
-        "@rollup/rollup-freebsd-arm64": "4.53.3",
-        "@rollup/rollup-freebsd-x64": "4.53.3",
-        "@rollup/rollup-linux-arm-gnueabihf": "4.53.3",
-        "@rollup/rollup-linux-arm-musleabihf": "4.53.3",
-        "@rollup/rollup-linux-arm64-gnu": "4.53.3",
-        "@rollup/rollup-linux-arm64-musl": "4.53.3",
-        "@rollup/rollup-linux-loong64-gnu": "4.53.3",
-        "@rollup/rollup-linux-ppc64-gnu": "4.53.3",
-        "@rollup/rollup-linux-riscv64-gnu": "4.53.3",
-        "@rollup/rollup-linux-riscv64-musl": "4.53.3",
-        "@rollup/rollup-linux-s390x-gnu": "4.53.3",
-        "@rollup/rollup-linux-x64-gnu": "4.53.3",
-        "@rollup/rollup-linux-x64-musl": "4.53.3",
-        "@rollup/rollup-openharmony-arm64": "4.53.3",
-        "@rollup/rollup-win32-arm64-msvc": "4.53.3",
-        "@rollup/rollup-win32-ia32-msvc": "4.53.3",
-        "@rollup/rollup-win32-x64-gnu": "4.53.3",
-        "@rollup/rollup-win32-x64-msvc": "4.53.3",
+        "@rollup/rollup-android-arm-eabi": "4.55.1",
+        "@rollup/rollup-android-arm64": "4.55.1",
+        "@rollup/rollup-darwin-arm64": "4.55.1",
+        "@rollup/rollup-darwin-x64": "4.55.1",
+        "@rollup/rollup-freebsd-arm64": "4.55.1",
+        "@rollup/rollup-freebsd-x64": "4.55.1",
+        "@rollup/rollup-linux-arm-gnueabihf": "4.55.1",
+        "@rollup/rollup-linux-arm-musleabihf": "4.55.1",
+        "@rollup/rollup-linux-arm64-gnu": "4.55.1",
+        "@rollup/rollup-linux-arm64-musl": "4.55.1",
+        "@rollup/rollup-linux-loong64-gnu": "4.55.1",
+        "@rollup/rollup-linux-loong64-musl": "4.55.1",
+        "@rollup/rollup-linux-ppc64-gnu": "4.55.1",
+        "@rollup/rollup-linux-ppc64-musl": "4.55.1",
+        "@rollup/rollup-linux-riscv64-gnu": "4.55.1",
+        "@rollup/rollup-linux-riscv64-musl": "4.55.1",
+        "@rollup/rollup-linux-s390x-gnu": "4.55.1",
+        "@rollup/rollup-linux-x64-gnu": "4.55.1",
+        "@rollup/rollup-linux-x64-musl": "4.55.1",
+        "@rollup/rollup-openbsd-x64": "4.55.1",
+        "@rollup/rollup-openharmony-arm64": "4.55.1",
+        "@rollup/rollup-win32-arm64-msvc": "4.55.1",
+        "@rollup/rollup-win32-ia32-msvc": "4.55.1",
+        "@rollup/rollup-win32-x64-gnu": "4.55.1",
+        "@rollup/rollup-win32-x64-msvc": "4.55.1",
         "fsevents": "~2.3.2"
       }
     },
@@ -3748,7 +3819,9 @@
       "peer": true
     },
     "node_modules/semver": {
-      "version": "7.7.2",
+      "version": "7.7.3",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-7.7.3.tgz",
+      "integrity": "sha512-SdsKMrI9TdgjdweUSR9MweHA4EJ8YxHn8DFaDisvhVlUOe4BF1tLD7GAj0lIqWVl+dPb/rExr0Btby5loQm20Q==",
       "dev": true,
       "license": "ISC",
       "bin": {
@@ -3970,24 +4043,6 @@
         "url": "https://github.com/sponsors/SuperchupuDev"
       }
     },
-    "node_modules/tinyglobby/node_modules/fdir": {
-      "version": "6.5.0",
-      "resolved": "https://registry.npmjs.org/fdir/-/fdir-6.5.0.tgz",
-      "integrity": "sha512-tIbYtZbucOs0BRGqPJkshJUYdL+SDH7dVM8gjy+ERp3WAUjLEFJE+02kanyHtwjWOnwrKYBiwAmM0p4kLJAnXg==",
-      "dev": true,
-      "license": "MIT",
-      "engines": {
-        "node": ">=12.0.0"
-      },
-      "peerDependencies": {
-        "picomatch": "^3 || ^4"
-      },
-      "peerDependenciesMeta": {
-        "picomatch": {
-          "optional": true
-        }
-      }
-    },
     "node_modules/tinyglobby/node_modules/picomatch": {
       "version": "4.0.3",
       "resolved": "https://registry.npmjs.org/picomatch/-/picomatch-4.0.3.tgz",
@@ -4021,9 +4076,9 @@
       }
     },
     "node_modules/ts-api-utils": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/ts-api-utils/-/ts-api-utils-2.1.0.tgz",
-      "integrity": "sha512-CUgTZL1irw8u29bzrOD/nH85jqyc74D6SshFgujOIA7osm2Rz7dYH77agkx7H4FBNxDq7Cjf+IjaX/8zwFW+ZQ==",
+      "version": "2.4.0",
+      "resolved": "https://registry.npmjs.org/ts-api-utils/-/ts-api-utils-2.4.0.tgz",
+      "integrity": "sha512-3TaVTaAv2gTiMB35i3FiGJaRfwb3Pyn/j3m/bfAvGe8FB7CF6u+LMYqYlDh7reQf7UNvoTvdfAqHGmPGOSsPmA==",
       "dev": true,
       "license": "MIT",
       "engines": {
@@ -4078,16 +4133,16 @@
       }
     },
     "node_modules/typescript-eslint": {
-      "version": "8.49.0",
-      "resolved": "https://registry.npmjs.org/typescript-eslint/-/typescript-eslint-8.49.0.tgz",
-      "integrity": "sha512-zRSVH1WXD0uXczCXw+nsdjGPUdx4dfrs5VQoHnUWmv1U3oNlAKv4FUNdLDhVUg+gYn+a5hUESqch//Rv5wVhrg==",
+      "version": "8.53.0",
+      "resolved": "https://registry.npmjs.org/typescript-eslint/-/typescript-eslint-8.53.0.tgz",
+      "integrity": "sha512-xHURCQNxZ1dsWn0sdOaOfCSQG0HKeqSj9OexIxrz6ypU6wHYOdX2I3D2b8s8wFSsSOYJb+6q283cLiLlkEsBYw==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "@typescript-eslint/eslint-plugin": "8.49.0",
-        "@typescript-eslint/parser": "8.49.0",
-        "@typescript-eslint/typescript-estree": "8.49.0",
-        "@typescript-eslint/utils": "8.49.0"
+        "@typescript-eslint/eslint-plugin": "8.53.0",
+        "@typescript-eslint/parser": "8.53.0",
+        "@typescript-eslint/typescript-estree": "8.53.0",
+        "@typescript-eslint/utils": "8.53.0"
       },
       "engines": {
         "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
@@ -4319,19 +4374,19 @@
       }
     },
     "node_modules/vitest": {
-      "version": "4.0.15",
-      "resolved": "https://registry.npmjs.org/vitest/-/vitest-4.0.15.tgz",
-      "integrity": "sha512-n1RxDp8UJm6N0IbJLQo+yzLZ2sQCDyl1o0LeugbPWf8+8Fttp29GghsQBjYJVmWq3gBFfe9Hs1spR44vovn2wA==",
+      "version": "4.0.17",
+      "resolved": "https://registry.npmjs.org/vitest/-/vitest-4.0.17.tgz",
+      "integrity": "sha512-FQMeF0DJdWY0iOnbv466n/0BudNdKj1l5jYgl5JVTwjSsZSlqyXFt/9+1sEyhR6CLowbZpV7O1sCHrzBhucKKg==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "@vitest/expect": "4.0.15",
-        "@vitest/mocker": "4.0.15",
-        "@vitest/pretty-format": "4.0.15",
-        "@vitest/runner": "4.0.15",
-        "@vitest/snapshot": "4.0.15",
-        "@vitest/spy": "4.0.15",
-        "@vitest/utils": "4.0.15",
+        "@vitest/expect": "4.0.17",
+        "@vitest/mocker": "4.0.17",
+        "@vitest/pretty-format": "4.0.17",
+        "@vitest/runner": "4.0.17",
+        "@vitest/snapshot": "4.0.17",
+        "@vitest/spy": "4.0.17",
+        "@vitest/utils": "4.0.17",
         "es-module-lexer": "^1.7.0",
         "expect-type": "^1.2.2",
         "magic-string": "^0.30.21",
@@ -4359,10 +4414,10 @@
         "@edge-runtime/vm": "*",
         "@opentelemetry/api": "^1.9.0",
         "@types/node": "^20.0.0 || ^22.0.0 || >=24.0.0",
-        "@vitest/browser-playwright": "4.0.15",
-        "@vitest/browser-preview": "4.0.15",
-        "@vitest/browser-webdriverio": "4.0.15",
-        "@vitest/ui": "4.0.15",
+        "@vitest/browser-playwright": "4.0.17",
+        "@vitest/browser-preview": "4.0.17",
+        "@vitest/browser-webdriverio": "4.0.17",
+        "@vitest/ui": "4.0.17",
         "happy-dom": "*",
         "jsdom": "*"
       },
@@ -4397,13 +4452,13 @@
       }
     },
     "node_modules/vitest/node_modules/@vitest/mocker": {
-      "version": "4.0.15",
-      "resolved": "https://registry.npmjs.org/@vitest/mocker/-/mocker-4.0.15.tgz",
-      "integrity": "sha512-CZ28GLfOEIFkvCFngN8Sfx5h+Se0zN+h4B7yOsPVCcgtiO7t5jt9xQh2E1UkFep+eb9fjyMfuC5gBypwb07fvQ==",
+      "version": "4.0.17",
+      "resolved": "https://registry.npmjs.org/@vitest/mocker/-/mocker-4.0.17.tgz",
+      "integrity": "sha512-+ZtQhLA3lDh1tI2wxe3yMsGzbp7uuJSWBM1iTIKCbppWTSBN09PUC+L+fyNlQApQoR+Ps8twt2pbSSXg2fQVEQ==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "@vitest/spy": "4.0.15",
+        "@vitest/spy": "4.0.17",
         "estree-walker": "^3.0.3",
         "magic-string": "^0.30.21"
       },
@@ -4424,13 +4479,13 @@
       }
     },
     "node_modules/vitest/node_modules/vite": {
-      "version": "7.2.6",
-      "resolved": "https://registry.npmjs.org/vite/-/vite-7.2.6.tgz",
-      "integrity": "sha512-tI2l/nFHC5rLh7+5+o7QjKjSR04ivXDF4jcgV0f/bTQ+OJiITy5S6gaynVsEM+7RqzufMnVbIon6Sr5x1SDYaQ==",
+      "version": "7.3.1",
+      "resolved": "https://registry.npmjs.org/vite/-/vite-7.3.1.tgz",
+      "integrity": "sha512-w+N7Hifpc3gRjZ63vYBXA56dvvRlNWRczTdmCBBa+CotUzAPf5b7YMdMR/8CQoeYE5LX3W4wj6RYTgonm1b9DA==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "esbuild": "^0.25.0",
+        "esbuild": "^0.27.0",
         "fdir": "^6.5.0",
         "picomatch": "^4.0.3",
         "postcss": "^8.5.6",
diff --git a/package.json b/package.json
index aa49b1b..72bf8b3 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "date-and-time",
-  "version": "4.1.2",
+  "version": "4.2.0",
   "description": "The simplest, most intuitive date and time library",
   "keywords": [
     "date",
@@ -24,6 +24,11 @@
       "import": "./dist/plugin.js",
       "require": "./dist/plugin.cjs"
     },
+    "./timezone": {
+      "types": "./dist/timezone.d.ts",
+      "import": "./dist/timezone.js",
+      "require": "./dist/timezone.cjs"
+    },
     "./locales/*": {
       "types": "./dist/locales/*.d.ts",
       "import": "./dist/locales/*.js",
@@ -63,6 +68,7 @@
     "test": "vitest run",
     "test:coverage": "vitest run --coverage",
     "timezone": "tsx tools/timezone.ts",
+    "ts": "tsc --noEmit",
     "zonename": "tsx tools/zonename.ts"
   },
   "author": "KNOWLEDGECODE",
@@ -81,22 +87,21 @@
   "type": "module",
   "sideEffects": false,
   "devDependencies": {
-    "@eslint/js": "^9.39.2",
     "@rollup/plugin-alias": "^6.0.0",
     "@rollup/plugin-terser": "^0.4.4",
-    "@stylistic/eslint-plugin": "^5.6.1",
-    "@types/node": "^25.0.2",
-    "@vitest/coverage-v8": "^4.0.15",
+    "@stylistic/eslint-plugin": "^5.7.0",
+    "@types/node": "^25.0.9",
+    "@vitest/coverage-v8": "^4.0.17",
     "eslint": "^9.39.2",
     "glob": "^13.0.0",
-    "prettier": "^3.7.4",
-    "rollup": "^4.53.3",
+    "prettier": "^3.8.0",
+    "rollup": "^4.55.1",
     "rollup-plugin-dts": "^6.3.0",
     "rollup-plugin-esbuild": "^6.2.1",
     "tsx": "^4.21.0",
-    "typescript-eslint": "^8.49.0",
+    "typescript-eslint": "^8.53.0",
     "vitepress": "^1.6.4",
-    "vitest": "^4.0.15"
+    "vitest": "^4.0.17"
   },
   "overrides": {
     "esbuild": "^0.25.0"
diff --git a/rollup.config.ts b/rollup.config.ts
index d7cb06b..7ce0826 100644
--- a/rollup.config.ts
+++ b/rollup.config.ts
@@ -27,6 +27,7 @@ const ts = () => {
   return [
     config('src/index.ts', 'dist'),
     config('src/plugin.ts', 'dist'),
+    config('src/timezone.ts', 'dist'),
     config(Object.fromEntries(globSync('src/numerals/**/*.ts').map(input => [replacePath(input), input])), 'dist'),
     globSync('src/locales/**/*.ts').map(input => config(input, outputDir(input))),
     globSync('src/plugins/**/*.ts').map(input => config(input, outputDir(input))),
@@ -48,6 +49,7 @@ const types = () => {
   return [
     config('src/index.ts', 'dist'),
     config('src/plugin.ts', 'dist'),
+    config('src/timezone.ts', 'dist'),
     config(Object.fromEntries(globSync('src/numerals/**/*.ts').map(input => [replacePath(input), input])), 'dist'),
     globSync('src/locales/**/*.ts').map(input => config(input, outputDir(input))),
     globSync('src/plugins/**/*.ts').map(input => config(input, outputDir(input))),
diff --git a/src/addDays.ts b/src/addDays.ts
index 84e5dc7..aebcab8 100644
--- a/src/addDays.ts
+++ b/src/addDays.ts
@@ -1,6 +1,6 @@
 import { toParts, fromParts } from './datetime.ts';
-import { isTimeZone, isUTC, createTimezoneDate } from './timezone.ts';
-import type { TimeZone } from './timezone.ts';
+import { isTimeZone, isUTC, createTimezoneDate } from './zone.ts';
+import type { TimeZone } from './zone.ts';
 
 /**
  * Adds the specified number of days to a Date object.
diff --git a/src/addMonths.ts b/src/addMonths.ts
index 161988b..9f4a0be 100644
--- a/src/addMonths.ts
+++ b/src/addMonths.ts
@@ -1,6 +1,6 @@
 import { toParts, fromParts } from './datetime.ts';
-import { isTimeZone, isUTC, createTimezoneDate } from './timezone.ts';
-import type { TimeZone } from './timezone.ts';
+import { isTimeZone, isUTC, createTimezoneDate } from './zone.ts';
+import type { TimeZone } from './zone.ts';
 
 /**
  * Adds the specified number of months to a Date object.
diff --git a/src/addYears.ts b/src/addYears.ts
index 0e0db11..255a7cb 100644
--- a/src/addYears.ts
+++ b/src/addYears.ts
@@ -1,5 +1,5 @@
 import { addMonths } from './addMonths.ts';
-import type { TimeZone } from './timezone.ts';
+import type { TimeZone } from './zone.ts';
 
 /**
  * Adds the specified number of years to a Date object.
diff --git a/src/datetime.ts b/src/datetime.ts
index 7a37b7d..bcad93c 100644
--- a/src/datetime.ts
+++ b/src/datetime.ts
@@ -1,4 +1,5 @@
 import { getDateTimeFormat } from './dtf.ts';
+import { isUTC } from './zone.ts';
 
 export interface DateTimeParts {
   weekday: number;
@@ -13,7 +14,7 @@ export interface DateTimeParts {
 }
 
 export const toParts = (dateObj: Date, zoneName: string): DateTimeParts => {
-  if (zoneName.toUpperCase() === 'UTC') {
+  if (isUTC(zoneName)) {
     return {
       weekday: dateObj.getUTCDay(),
       year: dateObj.getUTCFullYear(),
@@ -102,11 +103,11 @@ export interface DateLike {
    */
   getMilliseconds(): number;
   /**
-   * Returns the day of the week (0-6; where 0 is Sunday).
+   * Returns the day of the week (0-6, where 0 is Sunday).
    */
   getDay(): number;
   /**
-   * Returns the time value in milliseconds since the Unix epoch (January 1; 1970).
+   * Returns the time value in milliseconds since the Unix epoch (January 1, 1970).
    */
   getTime(): number;
   /**
diff --git a/src/format.ts b/src/format.ts
index 42f76a5..39769f7 100644
--- a/src/format.ts
+++ b/src/format.ts
@@ -3,7 +3,7 @@ import { DateTime } from './datetime.ts';
 import { formatter as defaultFormatter } from './formatter.ts';
 import en from './locales/en.ts';
 import latn from './numerals/latn.ts';
-import { isTimeZone, isUTC } from './timezone.ts';
+import { isTimeZone } from './zone.ts';
 import type { CompiledObject } from './compile.ts';
 import type { FormatterOptions } from './formatter.ts';
 
@@ -18,15 +18,14 @@ const comment = /^\[(.*)\]$/;
  */
 export function format(dateObj: Date, arg: string | CompiledObject, options?: FormatterOptions) {
   const pattern = (typeof arg === 'string' ? compile(arg) : arg).slice(1);
-  const timeZone = isTimeZone(options?.timeZone) || isUTC(options?.timeZone) ? options.timeZone : undefined;
-  const zoneName = typeof timeZone === 'string' ? timeZone : timeZone?.zone_name ?? '';
+  const zoneName = isTimeZone(options?.timeZone) ? options.timeZone.zone_name : options?.timeZone;
   const dateTime = zoneName ? new DateTime(dateObj, zoneName) : dateObj;
   const formatterOptions = {
     hour12: options?.hour12 ?? 'h12',
     hour24: options?.hour24 ?? 'h23',
     numeral: options?.numeral ?? latn,
     calendar: options?.calendar ?? 'gregory',
-    timeZone,
+    timeZone: options?.timeZone,
     locale: options?.locale ?? en
   };
   const formatters = [...options?.plugins ?? [], defaultFormatter];
diff --git a/src/formatter.ts b/src/formatter.ts
index 8e7bea6..da25768 100644
--- a/src/formatter.ts
+++ b/src/formatter.ts
@@ -2,7 +2,7 @@ import type { CompiledObject } from './compile.ts';
 import type { DateLike } from './datetime.ts';
 import type { Locale } from './locale.ts';
 import type { Numeral } from './numeral.ts';
-import type { TimeZone } from './timezone.ts';
+import type { TimeZone } from './zone.ts';
 
 export interface FormatterPluginOptions {
   /**
@@ -31,12 +31,12 @@ export interface FormatterPluginOptions {
    */
   calendar: 'buddhist' | 'gregory';
 
-  /**
-   * The time zone to use for formatting dates and times.
-   * This can be a specific time zone object or 'UTC' to use Coordinated Universal Time.
-   * If not specified, it defaults to undefined, which means the local time zone will be used.
-   */
-  timeZone: TimeZone | 'UTC' | undefined;
+/**
+  * The time zone to use for formatting dates and times.
+  * This can be a specific time zone object, an IANA time zone name, or 'UTC' to use Coordinated Universal Time.
+  * If not specified, it defaults to undefined, which means the local time zone will be used.
+  */
+  timeZone: TimeZone | string | undefined;
 
   /**
    * The locale to use for formatting dates and times.
@@ -72,12 +72,12 @@ class DefaultFormatter extends FormatterPlugin {
 
   MMMM (d: DateLike, options: FormatterPluginOptions, compiledObj: CompiledObject) {
     const list = options.locale.getMonthList({ style: 'long', compiledObj });
-    return list[d.getMonth()] || '';
+    return list[d.getMonth()] ?? '';
   }
 
   MMM (d: DateLike, options: FormatterPluginOptions, compiledObj: CompiledObject) {
     const list = options.locale.getMonthList({ style: 'short', compiledObj });
-    return list[d.getMonth()] || '';
+    return list[d.getMonth()] ?? '';
   }
 
   MM (d: DateLike) {
@@ -106,22 +106,22 @@ class DefaultFormatter extends FormatterPlugin {
 
   AA (d: DateLike, options: FormatterPluginOptions, compiledObj: CompiledObject) {
     const list = options.locale.getMeridiemList({ style: 'long', compiledObj, case: 'uppercase' });
-    return list[+(d.getHours() > 11)] || '';
+    return list[+(d.getHours() > 11)] ?? '';
   }
 
   A (d: DateLike, options: FormatterPluginOptions, compiledObj: CompiledObject) {
     const list = options.locale.getMeridiemList({ style: 'short', compiledObj, case: 'uppercase' });
-    return list[+(d.getHours() > 11)] || '';
+    return list[+(d.getHours() > 11)] ?? '';
   }
 
   aa (d: DateLike, options: FormatterPluginOptions, compiledObj: CompiledObject) {
     const list = options.locale.getMeridiemList({ style: 'long', compiledObj, case: 'lowercase' });
-    return list[+(d.getHours() > 11)] || '';
+    return list[+(d.getHours() > 11)] ?? '';
   }
 
   a (d: DateLike, options: FormatterPluginOptions, compiledObj: CompiledObject) {
     const list = options.locale.getMeridiemList({ style: 'short', compiledObj, case: 'lowercase' });
-    return list[+(d.getHours() > 11)] || '';
+    return list[+(d.getHours() > 11)] ?? '';
   }
 
   hh (d: DateLike, options: FormatterPluginOptions) {
@@ -162,17 +162,17 @@ class DefaultFormatter extends FormatterPlugin {
 
   dddd (d: DateLike, options: FormatterPluginOptions, compiledObj: CompiledObject) {
     const list = options.locale.getDayOfWeekList({ style: 'long', compiledObj });
-    return list[d.getDay()] || '';
+    return list[d.getDay()] ?? '';
   }
 
   ddd (d: DateLike, options: FormatterPluginOptions, compiledObj: CompiledObject) {
     const list = options.locale.getDayOfWeekList({ style: 'short', compiledObj });
-    return list[d.getDay()] || '';
+    return list[d.getDay()] ?? '';
   }
 
   dd (d: DateLike, options: FormatterPluginOptions, compiledObj: CompiledObject) {
     const list = options.locale.getDayOfWeekList({ style: 'narrow', compiledObj });
-    return list[d.getDay()] || '';
+    return list[d.getDay()] ?? '';
   }
 
   Z (d: DateLike) {
diff --git a/src/parse.ts b/src/parse.ts
index df4e6ac..ba7ff78 100644
--- a/src/parse.ts
+++ b/src/parse.ts
@@ -1,4 +1,4 @@
-import { isTimeZone, isUTC, createTimezoneDate } from './timezone.ts';
+import { isTimeZone, isUTC, createTimezoneDate } from './zone.ts';
 import { validatePreparseResult } from './isValid.ts';
 import { preparse } from './preparse.ts';
 import type { CompiledObject } from './compile.ts';
diff --git a/src/parser.ts b/src/parser.ts
index 506db9b..ee01648 100644
--- a/src/parser.ts
+++ b/src/parser.ts
@@ -1,7 +1,7 @@
 import type { CompiledObject } from './compile.ts';
 import type { Locale } from './locale.ts';
 import type { Numeral } from './numeral.ts';
-import type { TimeZone } from './timezone.ts';
+import type { TimeZone } from './zone.ts';
 
 type ParserToken = 'Y' | 'M' | 'D' | 'H' | 'A' | 'h' | 'm' | 's' | 'S' | 'Z';
 
diff --git a/src/plugin.ts b/src/plugin.ts
index 0d9d8f3..847775e 100644
--- a/src/plugin.ts
+++ b/src/plugin.ts
@@ -6,4 +6,4 @@ export type { CompiledObject } from './compile.ts';
 export type { DateLike } from './datetime.ts';
 export type { Locale } from './locale.ts';
 export type { Numeral } from './numeral.ts';
-export type { TimeZone } from './timezone.ts';
+export type { TimeZone } from './zone.ts';
diff --git a/src/plugins/zonename.ts b/src/plugins/zonename.ts
index aa76333..a54fa33 100644
--- a/src/plugins/zonename.ts
+++ b/src/plugins/zonename.ts
@@ -1,5 +1,6 @@
 import timeZoneNames from '@/zonenames.ts';
 import { FormatterPlugin } from '@/plugin.ts';
+import { isTimeZone } from '@/zone.ts';
 import type { FormatterPluginOptions, DateLike } from '@/plugin.ts';
 
 const getLongTimezoneName = (time: number, zoneName?: string) => {
@@ -16,12 +17,12 @@ const getShortTimezoneName = (time: number, zoneName?: string) => {
 
 class Formatter extends FormatterPlugin {
   z (d: DateLike, options: FormatterPluginOptions) {
-    const zoneName = options.timeZone === 'UTC' ? 'UTC' : options.timeZone?.zone_name;
+    const zoneName = isTimeZone(options.timeZone) ? options.timeZone.zone_name : options.timeZone;
     return getShortTimezoneName(d.getTime(), zoneName);
   }
 
   zz (d: DateLike, options: FormatterPluginOptions) {
-    const zoneName = options.timeZone === 'UTC' ? 'UTC' : options.timeZone?.zone_name;
+    const zoneName = isTimeZone(options.timeZone) ? options.timeZone.zone_name : options.timeZone;
     return getLongTimezoneName(d.getTime(), zoneName);
   }
 }
diff --git a/src/preparse.ts b/src/preparse.ts
index c85f66f..8534674 100644
--- a/src/preparse.ts
+++ b/src/preparse.ts
@@ -1,5 +1,5 @@
 import { compile } from './compile.ts';
-import { isTimeZone, isUTC } from './timezone.ts';
+import { isTimeZone, isUTC } from './zone.ts';
 import { parser as defaultParser } from './parser.ts';
 import en from './locales/en.ts';
 import latn from './numerals/latn.ts';
diff --git a/src/timezone.ts b/src/timezone.ts
index 453a60c..160a2e7 100644
--- a/src/timezone.ts
+++ b/src/timezone.ts
@@ -1,34 +1,2091 @@
-import { getDateTimeFormat } from './dtf.ts';
+import { TimeZone } from '@/zone.ts';
 
-export interface TimeZone {
-  zone_name: string;
-  gmt_offset: number[];
-}
+export const Abidjan: TimeZone = {
+  zone_name: 'Africa/Abidjan',
+  gmt_offset: [0, -968]
+};
+
+export const Accra: TimeZone = {
+  zone_name: 'Africa/Accra',
+  gmt_offset: [1800, 1200, 0, -52]
+};
+
+export const Adak: TimeZone = {
+  zone_name: 'America/Adak',
+  gmt_offset: [44002, -32400, -36000, -39600, -42398]
+};
+
+export const Addis_Ababa: TimeZone = {
+  zone_name: 'Africa/Addis_Ababa',
+  gmt_offset: [10800, 9320, 9288]
+};
+
+export const Adelaide: TimeZone = {
+  zone_name: 'Australia/Adelaide',
+  gmt_offset: [37800, 34200, 33260, 32400]
+};
+
+export const Aden: TimeZone = {
+  zone_name: 'Asia/Aden',
+  gmt_offset: [10800, 10794]
+};
+
+export const Algiers: TimeZone = {
+  zone_name: 'Africa/Algiers',
+  gmt_offset: [7200, 3600, 732, 561, 0]
+};
+
+export const Almaty: TimeZone = {
+  zone_name: 'Asia/Almaty',
+  gmt_offset: [25200, 21600, 18468, 18000]
+};
+
+export const Amman: TimeZone = {
+  zone_name: 'Asia/Amman',
+  gmt_offset: [10800, 8624, 7200]
+};
+
+export const Amsterdam: TimeZone = {
+  zone_name: 'Europe/Amsterdam',
+  gmt_offset: [7200, 4800, 4772, 3600, 1200, 1172]
+};
+
+export const Anadyr: TimeZone = {
+  zone_name: 'Asia/Anadyr',
+  gmt_offset: [50400, 46800, 43200, 42596, 39600]
+};
+
+export const Anchorage: TimeZone = {
+  zone_name: 'America/Anchorage',
+  gmt_offset: [50424, -28800, -32400, -35976, -36000]
+};
+
+export const Andorra: TimeZone = {
+  zone_name: 'Europe/Andorra',
+  gmt_offset: [7200, 3600, 364, 0]
+};
+
+export const Anguilla: TimeZone = {
+  zone_name: 'America/Anguilla',
+  gmt_offset: [-14400, -15136]
+};
+
+export const Antananarivo: TimeZone = {
+  zone_name: 'Indian/Antananarivo',
+  gmt_offset: [14400, 11404, 10800]
+};
+
+export const Antigua: TimeZone = {
+  zone_name: 'America/Antigua',
+  gmt_offset: [-14400, -14832, -18000]
+};
+
+export const Apia: TimeZone = {
+  zone_name: 'Pacific/Apia',
+  gmt_offset: [50400, 46800, 45184, -36000, -39600, -41216, -41400]
+};
+
+export const Aqtau: TimeZone = {
+  zone_name: 'Asia/Aqtau',
+  gmt_offset: [21600, 18000, 14400, 12064]
+};
+
+export const Aqtobe: TimeZone = {
+  zone_name: 'Asia/Aqtobe',
+  gmt_offset: [21600, 18000, 14400, 13720]
+};
+
+export const Araguaina: TimeZone = {
+  zone_name: 'America/Araguaina',
+  gmt_offset: [-7200, -10800, -11568]
+};
+
+export const Aruba: TimeZone = {
+  zone_name: 'America/Aruba',
+  gmt_offset: [-14400, -16200, -16824]
+};
+
+export const Ashgabat: TimeZone = {
+  zone_name: 'Asia/Ashgabat',
+  gmt_offset: [21600, 18000, 14400, 14012]
+};
+
+export const Asmara: TimeZone = {
+  zone_name: 'Africa/Asmara',
+  gmt_offset: [10800, 9332, 9320]
+};
+
+export const Astrakhan: TimeZone = {
+  zone_name: 'Europe/Astrakhan',
+  gmt_offset: [18000, 14400, 11532, 10800]
+};
+
+export const Asuncion: TimeZone = {
+  zone_name: 'America/Asuncion',
+  gmt_offset: [-10800, -13840, -14400]
+};
+
+export const Athens: TimeZone = {
+  zone_name: 'Europe/Athens',
+  gmt_offset: [10800, 7200, 5692, 3600]
+};
+
+export const Atikokan: TimeZone = {
+  zone_name: 'America/Atikokan',
+  gmt_offset: [-18000, -21600, -21988]
+};
+
+export const Atyrau: TimeZone = {
+  zone_name: 'Asia/Atyrau',
+  gmt_offset: [21600, 18000, 14400, 12464, 10800]
+};
+
+export const Auckland: TimeZone = {
+  zone_name: 'Pacific/Auckland',
+  gmt_offset: [46800, 45000, 43200, 41944, 41400]
+};
+
+export const Azores: TimeZone = {
+  zone_name: 'Atlantic/Azores',
+  gmt_offset: [3600, 0, -3600, -6160, -6872, -7200]
+};
+
+export const Baghdad: TimeZone = {
+  zone_name: 'Asia/Baghdad',
+  gmt_offset: [14400, 10800, 10660, 10656]
+};
+
+export const Bahia: TimeZone = {
+  zone_name: 'America/Bahia',
+  gmt_offset: [-7200, -9244, -10800]
+};
+
+export const Bahia_Banderas: TimeZone = {
+  zone_name: 'America/Bahia_Banderas',
+  gmt_offset: [-18000, -21600, -25200, -25260]
+};
+
+export const Bahrain: TimeZone = {
+  zone_name: 'Asia/Bahrain',
+  gmt_offset: [14400, 12600, 12140, 10800]
+};
+
+export const Baku: TimeZone = {
+  zone_name: 'Asia/Baku',
+  gmt_offset: [18000, 14400, 11964, 10800]
+};
+
+export const Bamako: TimeZone = {
+  zone_name: 'Africa/Bamako',
+  gmt_offset: [0, -1920, -3600]
+};
+
+export const Bangkok: TimeZone = {
+  zone_name: 'Asia/Bangkok',
+  gmt_offset: [25200, 24124]
+};
+
+export const Bangui: TimeZone = {
+  zone_name: 'Africa/Bangui',
+  gmt_offset: [4460, 3600]
+};
+
+export const Banjul: TimeZone = {
+  zone_name: 'Africa/Banjul',
+  gmt_offset: [0, -3600, -3996]
+};
+
+export const Barbados: TimeZone = {
+  zone_name: 'America/Barbados',
+  gmt_offset: [-10800, -12600, -14309, -14400]
+};
+
+export const Barnaul: TimeZone = {
+  zone_name: 'Asia/Barnaul',
+  gmt_offset: [28800, 25200, 21600, 20100]
+};
+
+export const Beirut: TimeZone = {
+  zone_name: 'Asia/Beirut',
+  gmt_offset: [10800, 8520, 7200]
+};
+
+export const Belem: TimeZone = {
+  zone_name: 'America/Belem',
+  gmt_offset: [-7200, -10800, -11636]
+};
+
+export const Belgrade: TimeZone = {
+  zone_name: 'Europe/Belgrade',
+  gmt_offset: [7200, 4920, 3600]
+};
+
+export const Belize: TimeZone = {
+  zone_name: 'America/Belize',
+  gmt_offset: [-18000, -19800, -21168, -21600]
+};
+
+export const Berlin: TimeZone = {
+  zone_name: 'Europe/Berlin',
+  gmt_offset: [10800, 7200, 3600, 3208]
+};
+
+export const Bermuda: TimeZone = {
+  zone_name: 'Atlantic/Bermuda',
+  gmt_offset: [-10800, -11958, -14400, -15558]
+};
+
+export const Beulah: TimeZone = {
+  zone_name: 'America/North_Dakota/Beulah',
+  gmt_offset: [-18000, -21600, -24427, -25200]
+};
+
+export const Bishkek: TimeZone = {
+  zone_name: 'Asia/Bishkek',
+  gmt_offset: [25200, 21600, 18000, 17904]
+};
+
+export const Bissau: TimeZone = {
+  zone_name: 'Africa/Bissau',
+  gmt_offset: [0, -3600, -3740]
+};
+
+export const Blanc_Sablon: TimeZone = {
+  zone_name: 'America/Blanc-Sablon',
+  gmt_offset: [-10800, -13708, -14400]
+};
+
+export const Blantyre: TimeZone = {
+  zone_name: 'Africa/Blantyre',
+  gmt_offset: [8470, 8460, 8400, 7200]
+};
+
+export const Boa_Vista: TimeZone = {
+  zone_name: 'America/Boa_Vista',
+  gmt_offset: [-10800, -14400, -14560]
+};
+
+export const Bogota: TimeZone = {
+  zone_name: 'America/Bogota',
+  gmt_offset: [-14400, -17776, -18000]
+};
+
+export const Boise: TimeZone = {
+  zone_name: 'America/Boise',
+  gmt_offset: [-21600, -25200, -27889, -28800]
+};
+
+export const Bougainville: TimeZone = {
+  zone_name: 'Pacific/Bougainville',
+  gmt_offset: [39600, 37336, 36000, 35312, 32400]
+};
+
+export const Bratislava: TimeZone = {
+  zone_name: 'Europe/Bratislava',
+  gmt_offset: [7200, 3600, 3464, 0]
+};
+
+export const Brazzaville: TimeZone = {
+  zone_name: 'Africa/Brazzaville',
+  gmt_offset: [3668, 3600]
+};
+
+export const Brisbane: TimeZone = {
+  zone_name: 'Australia/Brisbane',
+  gmt_offset: [39600, 36728, 36000]
+};
+
+export const Broken_Hill: TimeZone = {
+  zone_name: 'Australia/Broken_Hill',
+  gmt_offset: [37800, 36000, 34200, 33948, 32400]
+};
+
+export const Brunei: TimeZone = {
+  zone_name: 'Asia/Brunei',
+  gmt_offset: [28800, 27580, 27000]
+};
+
+export const Brussels: TimeZone = {
+  zone_name: 'Europe/Brussels',
+  gmt_offset: [7200, 3600, 1050, 0]
+};
+
+export const Bucharest: TimeZone = {
+  zone_name: 'Europe/Bucharest',
+  gmt_offset: [10800, 7200, 6264]
+};
+
+export const Budapest: TimeZone = {
+  zone_name: 'Europe/Budapest',
+  gmt_offset: [7200, 4580, 3600]
+};
+
+export const Buenos_Aires: TimeZone = {
+  zone_name: 'America/Argentina/Buenos_Aires',
+  gmt_offset: [-7200, -10800, -14028, -14400, -15408]
+};
+
+export const Bujumbura: TimeZone = {
+  zone_name: 'Africa/Bujumbura',
+  gmt_offset: [7200, 7048]
+};
+
+export const Busingen: TimeZone = {
+  zone_name: 'Europe/Busingen',
+  gmt_offset: [7200, 3600, 2048, 1786]
+};
+
+export const Cairo: TimeZone = {
+  zone_name: 'Africa/Cairo',
+  gmt_offset: [10800, 7509, 7200]
+};
+
+export const Cambridge_Bay: TimeZone = {
+  zone_name: 'America/Cambridge_Bay',
+  gmt_offset: [0, -18000, -21600, -25200]
+};
+
+export const Campo_Grande: TimeZone = {
+  zone_name: 'America/Campo_Grande',
+  gmt_offset: [-10800, -13108, -14400]
+};
+
+export const Canary: TimeZone = {
+  zone_name: 'Atlantic/Canary',
+  gmt_offset: [3600, 0, -3600, -3696]
+};
+
+export const Cancun: TimeZone = {
+  zone_name: 'America/Cancun',
+  gmt_offset: [-14400, -18000, -20824, -21600]
+};
+
+export const Cape_Verde: TimeZone = {
+  zone_name: 'Atlantic/Cape_Verde',
+  gmt_offset: [-3600, -5644, -7200]
+};
+
+export const Caracas: TimeZone = {
+  zone_name: 'America/Caracas',
+  gmt_offset: [-14400, -16060, -16064, -16200]
+};
+
+export const Casablanca: TimeZone = {
+  zone_name: 'Africa/Casablanca',
+  gmt_offset: [3600, 0, -1820]
+};
+
+export const Casey: TimeZone = {
+  zone_name: 'Antarctica/Casey',
+  gmt_offset: [39600, 28800, 0]
+};
+
+export const Catamarca: TimeZone = {
+  zone_name: 'America/Argentina/Catamarca',
+  gmt_offset: [-7200, -10800, -14400, -15408, -15788]
+};
+
+export const Cayenne: TimeZone = {
+  zone_name: 'America/Cayenne',
+  gmt_offset: [-10800, -12560, -14400]
+};
+
+export const Cayman: TimeZone = {
+  zone_name: 'America/Cayman',
+  gmt_offset: [-18000, -18430, -19532]
+};
+
+export const Center: TimeZone = {
+  zone_name: 'America/North_Dakota/Center',
+  gmt_offset: [-18000, -21600, -24312, -25200]
+};
+
+export const Ceuta: TimeZone = {
+  zone_name: 'Africa/Ceuta',
+  gmt_offset: [7200, 3600, 0, -1276]
+};
+
+export const Chagos: TimeZone = {
+  zone_name: 'Indian/Chagos',
+  gmt_offset: [21600, 18000, 17380]
+};
+
+export const Chatham: TimeZone = {
+  zone_name: 'Pacific/Chatham',
+  gmt_offset: [49500, 45900, 44100, 44028]
+};
+
+export const Chicago: TimeZone = {
+  zone_name: 'America/Chicago',
+  gmt_offset: [-18000, -21036, -21600]
+};
+
+export const Chihuahua: TimeZone = {
+  zone_name: 'America/Chihuahua',
+  gmt_offset: [-18000, -21600, -25200, -25460]
+};
+
+export const Chisinau: TimeZone = {
+  zone_name: 'Europe/Chisinau',
+  gmt_offset: [14400, 10800, 7200, 6920, 6900, 6264, 3600]
+};
+
+export const Chita: TimeZone = {
+  zone_name: 'Asia/Chita',
+  gmt_offset: [36000, 32400, 28800, 27232]
+};
+
+export const Christmas: TimeZone = {
+  zone_name: 'Indian/Christmas',
+  gmt_offset: [25372, 25200]
+};
+
+export const Chuuk: TimeZone = {
+  zone_name: 'Pacific/Chuuk',
+  gmt_offset: [36428, 36000, 32400, -49972]
+};
+
+export const Ciudad_Juarez: TimeZone = {
+  zone_name: 'America/Ciudad_Juarez',
+  gmt_offset: [-18000, -21600, -25200, -25556]
+};
+
+export const Cocos: TimeZone = {
+  zone_name: 'Indian/Cocos',
+  gmt_offset: [23400, 23260]
+};
+
+export const Colombo: TimeZone = {
+  zone_name: 'Asia/Colombo',
+  gmt_offset: [23400, 21600, 19800, 19172, 19164]
+};
+
+export const Comoro: TimeZone = {
+  zone_name: 'Indian/Comoro',
+  gmt_offset: [10800, 10384]
+};
+
+export const Conakry: TimeZone = {
+  zone_name: 'Africa/Conakry',
+  gmt_offset: [0, -3292, -3600]
+};
+
+export const Copenhagen: TimeZone = {
+  zone_name: 'Europe/Copenhagen',
+  gmt_offset: [7200, 3600, 3020]
+};
+
+export const Cordoba: TimeZone = {
+  zone_name: 'America/Argentina/Cordoba',
+  gmt_offset: [-7200, -10800, -14400, -15408]
+};
+
+export const Costa_Rica: TimeZone = {
+  zone_name: 'America/Costa_Rica',
+  gmt_offset: [-18000, -20173, -21600]
+};
+
+export const Coyhaique: TimeZone = {
+  zone_name: 'America/Coyhaique',
+  gmt_offset: [-10800, -14400, -16965, -17296, -18000]
+};
+
+export const Creston: TimeZone = {
+  zone_name: 'America/Creston',
+  gmt_offset: [-25200, -27964, -28800]
+};
+
+export const Cuiaba: TimeZone = {
+  zone_name: 'America/Cuiaba',
+  gmt_offset: [-10800, -13460, -14400]
+};
+
+export const Curacao: TimeZone = {
+  zone_name: 'America/Curacao',
+  gmt_offset: [-14400, -16200, -16547]
+};
+
+export const Dakar: TimeZone = {
+  zone_name: 'Africa/Dakar',
+  gmt_offset: [0, -3600, -4184]
+};
+
+export const Damascus: TimeZone = {
+  zone_name: 'Asia/Damascus',
+  gmt_offset: [10800, 8712, 7200]
+};
+
+export const Danmarkshavn: TimeZone = {
+  zone_name: 'America/Danmarkshavn',
+  gmt_offset: [0, -4480, -7200, -10800]
+};
+
+export const Dar_es_Salaam: TimeZone = {
+  zone_name: 'Africa/Dar_es_Salaam',
+  gmt_offset: [10800, 9900, 9428]
+};
+
+export const Darwin: TimeZone = {
+  zone_name: 'Australia/Darwin',
+  gmt_offset: [37800, 34200, 32400, 31400]
+};
+
+export const Davis: TimeZone = {
+  zone_name: 'Antarctica/Davis',
+  gmt_offset: [25200, 18000, 0]
+};
+
+export const Dawson: TimeZone = {
+  zone_name: 'America/Dawson',
+  gmt_offset: [-25200, -28800, -32400, -33460]
+};
+
+export const Dawson_Creek: TimeZone = {
+  zone_name: 'America/Dawson_Creek',
+  gmt_offset: [-25200, -28800, -28856]
+};
+
+export const Denver: TimeZone = {
+  zone_name: 'America/Denver',
+  gmt_offset: [-21600, -25196, -25200]
+};
+
+export const Detroit: TimeZone = {
+  zone_name: 'America/Detroit',
+  gmt_offset: [-14400, -18000, -19931, -21600]
+};
+
+export const Dhaka: TimeZone = {
+  zone_name: 'Asia/Dhaka',
+  gmt_offset: [25200, 23400, 21700, 21600, 21200, 19800]
+};
+
+export const Dili: TimeZone = {
+  zone_name: 'Asia/Dili',
+  gmt_offset: [32400, 30140, 28800]
+};
+
+export const Djibouti: TimeZone = {
+  zone_name: 'Africa/Djibouti',
+  gmt_offset: [10800, 10356]
+};
+
+export const Dominica: TimeZone = {
+  zone_name: 'America/Dominica',
+  gmt_offset: [-14400, -14736]
+};
+
+export const Douala: TimeZone = {
+  zone_name: 'Africa/Douala',
+  gmt_offset: [3600, 2328]
+};
+
+export const Dubai: TimeZone = {
+  zone_name: 'Asia/Dubai',
+  gmt_offset: [14400, 13272]
+};
+
+export const Dublin: TimeZone = {
+  zone_name: 'Europe/Dublin',
+  gmt_offset: [3600, 2079, 0, -1521]
+};
+
+export const DumontDUrville: TimeZone = {
+  zone_name: 'Antarctica/DumontDUrville',
+  gmt_offset: [36000, 0]
+};
+
+export const Dushanbe: TimeZone = {
+  zone_name: 'Asia/Dushanbe',
+  gmt_offset: [25200, 21600, 18000, 16512]
+};
+
+export const Easter: TimeZone = {
+  zone_name: 'Pacific/Easter',
+  gmt_offset: [-18000, -21600, -25200, -26248]
+};
+
+export const Edmonton: TimeZone = {
+  zone_name: 'America/Edmonton',
+  gmt_offset: [-21600, -25200, -27232]
+};
+
+export const Efate: TimeZone = {
+  zone_name: 'Pacific/Efate',
+  gmt_offset: [43200, 40396, 39600]
+};
+
+export const Eirunepe: TimeZone = {
+  zone_name: 'America/Eirunepe',
+  gmt_offset: [-14400, -16768, -18000]
+};
+
+export const El_Aaiun: TimeZone = {
+  zone_name: 'Africa/El_Aaiun',
+  gmt_offset: [3600, 0, -3168, -3600]
+};
+
+export const El_Salvador: TimeZone = {
+  zone_name: 'America/El_Salvador',
+  gmt_offset: [-18000, -21408, -21600]
+};
+
+export const Eucla: TimeZone = {
+  zone_name: 'Australia/Eucla',
+  gmt_offset: [35100, 31500, 30928]
+};
+
+export const Fakaofo: TimeZone = {
+  zone_name: 'Pacific/Fakaofo',
+  gmt_offset: [46800, -39600, -41096]
+};
+
+export const Famagusta: TimeZone = {
+  zone_name: 'Asia/Famagusta',
+  gmt_offset: [10800, 8148, 7200]
+};
+
+export const Faroe: TimeZone = {
+  zone_name: 'Atlantic/Faroe',
+  gmt_offset: [3600, 0, -1624]
+};
+
+export const Fiji: TimeZone = {
+  zone_name: 'Pacific/Fiji',
+  gmt_offset: [46800, 43200, 42944]
+};
+
+export const Fort_Nelson: TimeZone = {
+  zone_name: 'America/Fort_Nelson',
+  gmt_offset: [-25200, -28800, -29447]
+};
+
+export const Fortaleza: TimeZone = {
+  zone_name: 'America/Fortaleza',
+  gmt_offset: [-7200, -9240, -10800]
+};
+
+export const Freetown: TimeZone = {
+  zone_name: 'Africa/Freetown',
+  gmt_offset: [0, -2400, -3180, -3600]
+};
+
+export const Funafuti: TimeZone = {
+  zone_name: 'Pacific/Funafuti',
+  gmt_offset: [43200, 43012]
+};
+
+export const Gaborone: TimeZone = {
+  zone_name: 'Africa/Gaborone',
+  gmt_offset: [10800, 7200, 6220, 5400]
+};
+
+export const Galapagos: TimeZone = {
+  zone_name: 'Pacific/Galapagos',
+  gmt_offset: [-18000, -21504, -21600]
+};
+
+export const Gambier: TimeZone = {
+  zone_name: 'Pacific/Gambier',
+  gmt_offset: [-32388, -32400]
+};
+
+export const Gaza: TimeZone = {
+  zone_name: 'Asia/Gaza',
+  gmt_offset: [10800, 8272, 7200]
+};
+
+export const Gibraltar: TimeZone = {
+  zone_name: 'Europe/Gibraltar',
+  gmt_offset: [7200, 3600, 0, -1284]
+};
+
+export const Glace_Bay: TimeZone = {
+  zone_name: 'America/Glace_Bay',
+  gmt_offset: [-10800, -14388, -14400]
+};
+
+export const Goose_Bay: TimeZone = {
+  zone_name: 'America/Goose_Bay',
+  gmt_offset: [-7200, -9000, -9052, -10800, -12600, -12652, -14400, -14500]
+};
+
+export const Grand_Turk: TimeZone = {
+  zone_name: 'America/Grand_Turk',
+  gmt_offset: [-14400, -17072, -18000, -18430]
+};
+
+export const Grenada: TimeZone = {
+  zone_name: 'America/Grenada',
+  gmt_offset: [-14400, -14820]
+};
+
+export const Guadalcanal: TimeZone = {
+  zone_name: 'Pacific/Guadalcanal',
+  gmt_offset: [39600, 38388]
+};
+
+export const Guadeloupe: TimeZone = {
+  zone_name: 'America/Guadeloupe',
+  gmt_offset: [-14400, -14768]
+};
+
+export const Guam: TimeZone = {
+  zone_name: 'Pacific/Guam',
+  gmt_offset: [39600, 36000, 34740, 32400, -51660]
+};
+
+export const Guatemala: TimeZone = {
+  zone_name: 'America/Guatemala',
+  gmt_offset: [-18000, -21600, -21724]
+};
+
+export const Guayaquil: TimeZone = {
+  zone_name: 'America/Guayaquil',
+  gmt_offset: [-14400, -18000, -18840, -19160]
+};
+
+export const Guernsey: TimeZone = {
+  zone_name: 'Europe/Guernsey',
+  gmt_offset: [7200, 3600, 0, -609]
+};
+
+export const Guyana: TimeZone = {
+  zone_name: 'America/Guyana',
+  gmt_offset: [-10800, -13500, -13959, -14400]
+};
+
+export const Halifax: TimeZone = {
+  zone_name: 'America/Halifax',
+  gmt_offset: [-10800, -14400, -15264]
+};
+
+export const Harare: TimeZone = {
+  zone_name: 'Africa/Harare',
+  gmt_offset: [7452, 7200]
+};
+
+export const Havana: TimeZone = {
+  zone_name: 'America/Havana',
+  gmt_offset: [-14400, -18000, -19768, -19776]
+};
+
+export const Hebron: TimeZone = {
+  zone_name: 'Asia/Hebron',
+  gmt_offset: [10800, 8423, 7200]
+};
+
+export const Helsinki: TimeZone = {
+  zone_name: 'Europe/Helsinki',
+  gmt_offset: [10800, 7200, 5989]
+};
+
+export const Hermosillo: TimeZone = {
+  zone_name: 'America/Hermosillo',
+  gmt_offset: [-21600, -25200, -26632]
+};
+
+export const Ho_Chi_Minh: TimeZone = {
+  zone_name: 'Asia/Ho_Chi_Minh',
+  gmt_offset: [32400, 28800, 25590, 25200]
+};
+
+export const Hobart: TimeZone = {
+  zone_name: 'Australia/Hobart',
+  gmt_offset: [39600, 36000, 35356]
+};
+
+export const Hong_Kong: TimeZone = {
+  zone_name: 'Asia/Hong_Kong',
+  gmt_offset: [32400, 30600, 28800, 27402]
+};
+
+export const Honolulu: TimeZone = {
+  zone_name: 'Pacific/Honolulu',
+  gmt_offset: [-34200, -36000, -37800, -37886]
+};
+
+export const Hovd: TimeZone = {
+  zone_name: 'Asia/Hovd',
+  gmt_offset: [28800, 25200, 21996, 21600]
+};
+
+export const Indianapolis: TimeZone = {
+  zone_name: 'America/Indiana/Indianapolis',
+  gmt_offset: [-14400, -18000, -20678, -21600]
+};
+
+export const Inuvik: TimeZone = {
+  zone_name: 'America/Inuvik',
+  gmt_offset: [0, -21600, -25200, -28800]
+};
+
+export const Iqaluit: TimeZone = {
+  zone_name: 'America/Iqaluit',
+  gmt_offset: [0, -14400, -18000, -21600]
+};
+
+export const Irkutsk: TimeZone = {
+  zone_name: 'Asia/Irkutsk',
+  gmt_offset: [32400, 28800, 25200, 25025]
+};
+
+export const Isle_of_Man: TimeZone = {
+  zone_name: 'Europe/Isle_of_Man',
+  gmt_offset: [7200, 3600, 0, -1075]
+};
+
+export const Istanbul: TimeZone = {
+  zone_name: 'Europe/Istanbul',
+  gmt_offset: [14400, 10800, 7200, 7016, 6952]
+};
+
+export const Jakarta: TimeZone = {
+  zone_name: 'Asia/Jakarta',
+  gmt_offset: [32400, 28800, 27000, 26400, 25632, 25200]
+};
+
+export const Jamaica: TimeZone = {
+  zone_name: 'America/Jamaica',
+  gmt_offset: [-14400, -18000, -18430]
+};
+
+export const Jayapura: TimeZone = {
+  zone_name: 'Asia/Jayapura',
+  gmt_offset: [34200, 33768, 32400]
+};
+
+export const Jersey: TimeZone = {
+  zone_name: 'Europe/Jersey',
+  gmt_offset: [7200, 3600, 0, -506]
+};
+
+export const Jerusalem: TimeZone = {
+  zone_name: 'Asia/Jerusalem',
+  gmt_offset: [14400, 10800, 8454, 8440, 7200]
+};
+
+export const Johannesburg: TimeZone = {
+  zone_name: 'Africa/Johannesburg',
+  gmt_offset: [10800, 7200, 6720, 5400]
+};
+
+export const Juba: TimeZone = {
+  zone_name: 'Africa/Juba',
+  gmt_offset: [10800, 7588, 7200]
+};
+
+export const Jujuy: TimeZone = {
+  zone_name: 'America/Argentina/Jujuy',
+  gmt_offset: [-7200, -10800, -14400, -15408, -15672]
+};
+
+export const Juneau: TimeZone = {
+  zone_name: 'America/Juneau',
+  gmt_offset: [54139, -25200, -28800, -32261, -32400]
+};
+
+export const Kabul: TimeZone = {
+  zone_name: 'Asia/Kabul',
+  gmt_offset: [16608, 16200, 14400]
+};
+
+export const Kaliningrad: TimeZone = {
+  zone_name: 'Europe/Kaliningrad',
+  gmt_offset: [14400, 10800, 7200, 4920, 3600]
+};
+
+export const Kamchatka: TimeZone = {
+  zone_name: 'Asia/Kamchatka',
+  gmt_offset: [46800, 43200, 39600, 38076]
+};
+
+export const Kampala: TimeZone = {
+  zone_name: 'Africa/Kampala',
+  gmt_offset: [10800, 9900, 9000, 7780]
+};
+
+export const Kanton: TimeZone = {
+  zone_name: 'Pacific/Kanton',
+  gmt_offset: [46800, 0, -39600, -43200]
+};
+
+export const Karachi: TimeZone = {
+  zone_name: 'Asia/Karachi',
+  gmt_offset: [23400, 21600, 19800, 18000, 16092]
+};
+
+export const Kathmandu: TimeZone = {
+  zone_name: 'Asia/Kathmandu',
+  gmt_offset: [20700, 20476, 19800]
+};
+
+export const Kerguelen: TimeZone = {
+  zone_name: 'Indian/Kerguelen',
+  gmt_offset: [18000, 0]
+};
+
+export const Khandyga: TimeZone = {
+  zone_name: 'Asia/Khandyga',
+  gmt_offset: [39600, 36000, 32533, 32400, 28800]
+};
+
+export const Khartoum: TimeZone = {
+  zone_name: 'Africa/Khartoum',
+  gmt_offset: [10800, 7808, 7200]
+};
+
+export const Kigali: TimeZone = {
+  zone_name: 'Africa/Kigali',
+  gmt_offset: [7216, 7200]
+};
+
+export const Kinshasa: TimeZone = {
+  zone_name: 'Africa/Kinshasa',
+  gmt_offset: [3672, 3600]
+};
+
+export const Kiritimati: TimeZone = {
+  zone_name: 'Pacific/Kiritimati',
+  gmt_offset: [50400, -36000, -37760, -38400]
+};
+
+export const Kirov: TimeZone = {
+  zone_name: 'Europe/Kirov',
+  gmt_offset: [18000, 14400, 11928, 10800]
+};
+
+export const Knox: TimeZone = {
+  zone_name: 'America/Indiana/Knox',
+  gmt_offset: [-18000, -20790, -21600]
+};
+
+export const Kolkata: TimeZone = {
+  zone_name: 'Asia/Kolkata',
+  gmt_offset: [23400, 21208, 21200, 19800, 19270]
+};
+
+export const Kosrae: TimeZone = {
+  zone_name: 'Pacific/Kosrae',
+  gmt_offset: [43200, 39600, 39116, 36000, 32400, -47284]
+};
+
+export const Kralendijk: TimeZone = {
+  zone_name: 'America/Kralendijk',
+  gmt_offset: [-10800, -14400, -15865]
+};
+
+export const Krasnoyarsk: TimeZone = {
+  zone_name: 'Asia/Krasnoyarsk',
+  gmt_offset: [28800, 25200, 22286, 21600]
+};
+
+export const Kuala_Lumpur: TimeZone = {
+  zone_name: 'Asia/Kuala_Lumpur',
+  gmt_offset: [32400, 28800, 27000, 26400, 25200, 24925, 24406]
+};
+
+export const Kuching: TimeZone = {
+  zone_name: 'Asia/Kuching',
+  gmt_offset: [32400, 30000, 28800, 27000, 26480]
+};
+
+export const Kuwait: TimeZone = {
+  zone_name: 'Asia/Kuwait',
+  gmt_offset: [11516, 10800]
+};
+
+export const Kwajalein: TimeZone = {
+  zone_name: 'Pacific/Kwajalein',
+  gmt_offset: [43200, 40160, 39600, 36000, 32400, -43200]
+};
+
+export const Kyiv: TimeZone = {
+  zone_name: 'Europe/Kyiv',
+  gmt_offset: [14400, 10800, 7324, 7200, 3600]
+};
+
+export const La_Paz: TimeZone = {
+  zone_name: 'America/La_Paz',
+  gmt_offset: [-12756, -14400, -16356]
+};
+
+export const La_Rioja: TimeZone = {
+  zone_name: 'America/Argentina/La_Rioja',
+  gmt_offset: [-7200, -10800, -14400, -15408, -16044]
+};
+
+export const Lagos: TimeZone = {
+  zone_name: 'Africa/Lagos',
+  gmt_offset: [3600, 1800, 815, 0]
+};
+
+export const Libreville: TimeZone = {
+  zone_name: 'Africa/Libreville',
+  gmt_offset: [3600, 2268]
+};
+
+export const Lima: TimeZone = {
+  zone_name: 'America/Lima',
+  gmt_offset: [-14400, -18000, -18492, -18516]
+};
+
+export const Lindeman: TimeZone = {
+  zone_name: 'Australia/Lindeman',
+  gmt_offset: [39600, 36000, 35756]
+};
+
+export const Lisbon: TimeZone = {
+  zone_name: 'Europe/Lisbon',
+  gmt_offset: [7200, 3600, 0, -2205]
+};
+
+export const Ljubljana: TimeZone = {
+  zone_name: 'Europe/Ljubljana',
+  gmt_offset: [7200, 3600, 3484]
+};
+
+export const Lome: TimeZone = {
+  zone_name: 'Africa/Lome',
+  gmt_offset: [292, 0]
+};
+
+export const London: TimeZone = {
+  zone_name: 'Europe/London',
+  gmt_offset: [7200, 3600, 0, -75]
+};
+
+export const Longyearbyen: TimeZone = {
+  zone_name: 'Arctic/Longyearbyen',
+  gmt_offset: [10800, 7200, 3600, 3208]
+};
+
+export const Lord_Howe: TimeZone = {
+  zone_name: 'Australia/Lord_Howe',
+  gmt_offset: [41400, 39600, 38180, 37800, 36000]
+};
+
+export const Los_Angeles: TimeZone = {
+  zone_name: 'America/Los_Angeles',
+  gmt_offset: [-25200, -28378, -28800]
+};
+
+export const Louisville: TimeZone = {
+  zone_name: 'America/Kentucky/Louisville',
+  gmt_offset: [-14400, -18000, -20582, -21600]
+};
+
+export const Lower_Princes: TimeZone = {
+  zone_name: 'America/Lower_Princes',
+  gmt_offset: [-10800, -14400, -15865]
+};
+
+export const Luanda: TimeZone = {
+  zone_name: 'Africa/Luanda',
+  gmt_offset: [3600, 3176, 3124]
+};
+
+export const Lubumbashi: TimeZone = {
+  zone_name: 'Africa/Lubumbashi',
+  gmt_offset: [7200, 6592, 3600]
+};
+
+export const Lusaka: TimeZone = {
+  zone_name: 'Africa/Lusaka',
+  gmt_offset: [7200, 6788]
+};
+
+export const Luxembourg: TimeZone = {
+  zone_name: 'Europe/Luxembourg',
+  gmt_offset: [7200, 3600, 1476, 0]
+};
+
+export const Macau: TimeZone = {
+  zone_name: 'Asia/Macau',
+  gmt_offset: [36000, 32400, 28800, 27250]
+};
+
+export const Maceio: TimeZone = {
+  zone_name: 'America/Maceio',
+  gmt_offset: [-7200, -8572, -10800]
+};
+
+export const Macquarie: TimeZone = {
+  zone_name: 'Antarctica/Macquarie',
+  gmt_offset: [39600, 36000, 0]
+};
+
+export const Madeira: TimeZone = {
+  zone_name: 'Atlantic/Madeira',
+  gmt_offset: [3600, 0, -3600, -4056]
+};
+
+export const Madrid: TimeZone = {
+  zone_name: 'Europe/Madrid',
+  gmt_offset: [7200, 3600, 0, -884]
+};
+
+export const Magadan: TimeZone = {
+  zone_name: 'Asia/Magadan',
+  gmt_offset: [43200, 39600, 36192, 36000]
+};
+
+export const Mahe: TimeZone = {
+  zone_name: 'Indian/Mahe',
+  gmt_offset: [14400, 13308]
+};
+
+export const Majuro: TimeZone = {
+  zone_name: 'Pacific/Majuro',
+  gmt_offset: [43200, 41088, 39600, 36000, 32400]
+};
+
+export const Makassar: TimeZone = {
+  zone_name: 'Asia/Makassar',
+  gmt_offset: [32400, 28800, 28656]
+};
+
+export const Malabo: TimeZone = {
+  zone_name: 'Africa/Malabo',
+  gmt_offset: [3600, 2108, 0]
+};
+
+export const Maldives: TimeZone = {
+  zone_name: 'Indian/Maldives',
+  gmt_offset: [18000, 17640]
+};
+
+export const Malta: TimeZone = {
+  zone_name: 'Europe/Malta',
+  gmt_offset: [7200, 3600, 3484]
+};
+
+export const Managua: TimeZone = {
+  zone_name: 'America/Managua',
+  gmt_offset: [-18000, -20708, -20712, -21600]
+};
+
+export const Manaus: TimeZone = {
+  zone_name: 'America/Manaus',
+  gmt_offset: [-10800, -14400, -14404]
+};
+
+export const Manila: TimeZone = {
+  zone_name: 'Asia/Manila',
+  gmt_offset: [32400, 29032, 28800, -57368]
+};
+
+export const Maputo: TimeZone = {
+  zone_name: 'Africa/Maputo',
+  gmt_offset: [7818, 7200]
+};
+
+export const Marengo: TimeZone = {
+  zone_name: 'America/Indiana/Marengo',
+  gmt_offset: [-14400, -18000, -20723, -21600]
+};
+
+export const Mariehamn: TimeZone = {
+  zone_name: 'Europe/Mariehamn',
+  gmt_offset: [10800, 7200, 5989]
+};
+
+export const Marigot: TimeZone = {
+  zone_name: 'America/Marigot',
+  gmt_offset: [-10800, -14400, -15865]
+};
+
+export const Marquesas: TimeZone = {
+  zone_name: 'Pacific/Marquesas',
+  gmt_offset: [-33480, -34200]
+};
+
+export const Martinique: TimeZone = {
+  zone_name: 'America/Martinique',
+  gmt_offset: [-10800, -14400, -14660]
+};
+
+export const Maseru: TimeZone = {
+  zone_name: 'Africa/Maseru',
+  gmt_offset: [10800, 7200, 6600]
+};
+
+export const Matamoros: TimeZone = {
+  zone_name: 'America/Matamoros',
+  gmt_offset: [-18000, -21600, -23400]
+};
+
+export const Mauritius: TimeZone = {
+  zone_name: 'Indian/Mauritius',
+  gmt_offset: [18000, 14400, 13800]
+};
+
+export const Mawson: TimeZone = {
+  zone_name: 'Antarctica/Mawson',
+  gmt_offset: [21600, 18000, 0]
+};
+
+export const Mayotte: TimeZone = {
+  zone_name: 'Indian/Mayotte',
+  gmt_offset: [10856, 10800]
+};
+
+export const Mazatlan: TimeZone = {
+  zone_name: 'America/Mazatlan',
+  gmt_offset: [-21600, -25200, -25540]
+};
+
+export const Mbabane: TimeZone = {
+  zone_name: 'Africa/Mbabane',
+  gmt_offset: [7464, 7200]
+};
+
+export const McMurdo: TimeZone = {
+  zone_name: 'Antarctica/McMurdo',
+  gmt_offset: [46800, 43200]
+};
+
+export const Melbourne: TimeZone = {
+  zone_name: 'Australia/Melbourne',
+  gmt_offset: [39600, 36000, 34792]
+};
+
+export const Mendoza: TimeZone = {
+  zone_name: 'America/Argentina/Mendoza',
+  gmt_offset: [-7200, -10800, -14400, -15408, -16516]
+};
+
+export const Menominee: TimeZone = {
+  zone_name: 'America/Menominee',
+  gmt_offset: [-18000, -21027, -21600]
+};
+
+export const Merida: TimeZone = {
+  zone_name: 'America/Merida',
+  gmt_offset: [-18000, -21508, -21600]
+};
+
+export const Metlakatla: TimeZone = {
+  zone_name: 'America/Metlakatla',
+  gmt_offset: [54822, -25200, -28800, -31578, -32400]
+};
+
+export const Mexico_City: TimeZone = {
+  zone_name: 'America/Mexico_City',
+  gmt_offset: [-18000, -21600, -23796, -25200]
+};
+
+export const Midway: TimeZone = {
+  zone_name: 'Pacific/Midway',
+  gmt_offset: [-36000, -39600, -42568]
+};
+
+export const Minsk: TimeZone = {
+  zone_name: 'Europe/Minsk',
+  gmt_offset: [14400, 10800, 7200, 6616, 6600, 3600]
+};
+
+export const Miquelon: TimeZone = {
+  zone_name: 'America/Miquelon',
+  gmt_offset: [-7200, -10800, -13480, -14400]
+};
+
+export const Mogadishu: TimeZone = {
+  zone_name: 'Africa/Mogadishu',
+  gmt_offset: [10888, 10800, 9000]
+};
+
+export const Monaco: TimeZone = {
+  zone_name: 'Europe/Monaco',
+  gmt_offset: [7200, 3600, 1772, 561, 0]
+};
+
+export const Moncton: TimeZone = {
+  zone_name: 'America/Moncton',
+  gmt_offset: [-10800, -14400, -15548, -18000]
+};
+
+export const Monrovia: TimeZone = {
+  zone_name: 'Africa/Monrovia',
+  gmt_offset: [0, -2588, -2670]
+};
+
+export const Monterrey: TimeZone = {
+  zone_name: 'America/Monterrey',
+  gmt_offset: [-18000, -21600, -24076, -25200]
+};
+
+export const Montevideo: TimeZone = {
+  zone_name: 'America/Montevideo',
+  gmt_offset: [-5400, -7200, -9000, -10800, -12600, -13491, -14400]
+};
+
+export const Monticello: TimeZone = {
+  zone_name: 'America/Kentucky/Monticello',
+  gmt_offset: [-14400, -18000, -20364, -21600]
+};
+
+export const Montserrat: TimeZone = {
+  zone_name: 'America/Montserrat',
+  gmt_offset: [-14400, -14932]
+};
+
+export const Moscow: TimeZone = {
+  zone_name: 'Europe/Moscow',
+  gmt_offset: [18000, 16279, 14400, 12679, 10800, 9079, 9017, 7200]
+};
+
+export const Muscat: TimeZone = {
+  zone_name: 'Asia/Muscat',
+  gmt_offset: [14400, 14064]
+};
+
+export const Nairobi: TimeZone = {
+  zone_name: 'Africa/Nairobi',
+  gmt_offset: [10800, 9900, 9000, 8836]
+};
+
+export const Nassau: TimeZone = {
+  zone_name: 'America/Nassau',
+  gmt_offset: [-14400, -18000, -18570]
+};
+
+export const Nauru: TimeZone = {
+  zone_name: 'Pacific/Nauru',
+  gmt_offset: [43200, 41400, 40060, 32400]
+};
+
+export const Ndjamena: TimeZone = {
+  zone_name: 'Africa/Ndjamena',
+  gmt_offset: [7200, 3612, 3600]
+};
+
+export const New_Salem: TimeZone = {
+  zone_name: 'America/North_Dakota/New_Salem',
+  gmt_offset: [-18000, -21600, -24339, -25200]
+};
+
+export const New_York: TimeZone = {
+  zone_name: 'America/New_York',
+  gmt_offset: [-14400, -17762, -18000]
+};
+
+export const Niamey: TimeZone = {
+  zone_name: 'Africa/Niamey',
+  gmt_offset: [3600, 508, 0, -3600]
+};
+
+export const Nicosia: TimeZone = {
+  zone_name: 'Asia/Nicosia',
+  gmt_offset: [10800, 8008, 7200]
+};
+
+export const Niue: TimeZone = {
+  zone_name: 'Pacific/Niue',
+  gmt_offset: [-39600, -40780, -40800]
+};
+
+export const Nome: TimeZone = {
+  zone_name: 'America/Nome',
+  gmt_offset: [46702, -28800, -32400, -36000, -39600, -39698]
+};
+
+export const Norfolk: TimeZone = {
+  zone_name: 'Pacific/Norfolk',
+  gmt_offset: [45000, 43200, 41400, 40320, 40312, 39600]
+};
+
+export const Noronha: TimeZone = {
+  zone_name: 'America/Noronha',
+  gmt_offset: [-3600, -7200, -7780]
+};
+
+export const Nouakchott: TimeZone = {
+  zone_name: 'Africa/Nouakchott',
+  gmt_offset: [0, -3600, -3828]
+};
+
+export const Noumea: TimeZone = {
+  zone_name: 'Pacific/Noumea',
+  gmt_offset: [43200, 39948, 39600]
+};
+
+export const Novokuznetsk: TimeZone = {
+  zone_name: 'Asia/Novokuznetsk',
+  gmt_offset: [28800, 25200, 21600, 20928]
+};
+
+export const Novosibirsk: TimeZone = {
+  zone_name: 'Asia/Novosibirsk',
+  gmt_offset: [28800, 25200, 21600, 19900]
+};
+
+export const Nuuk: TimeZone = {
+  zone_name: 'America/Nuuk',
+  gmt_offset: [-3600, -7200, -10800, -12416]
+};
+
+export const Ojinaga: TimeZone = {
+  zone_name: 'America/Ojinaga',
+  gmt_offset: [-18000, -21600, -25060, -25200]
+};
+
+export const Omsk: TimeZone = {
+  zone_name: 'Asia/Omsk',
+  gmt_offset: [25200, 21600, 18000, 17610]
+};
+
+export const Oral: TimeZone = {
+  zone_name: 'Asia/Oral',
+  gmt_offset: [21600, 18000, 14400, 12324, 10800]
+};
+
+export const Oslo: TimeZone = {
+  zone_name: 'Europe/Oslo',
+  gmt_offset: [7200, 3600, 2580]
+};
+
+export const Ouagadougou: TimeZone = {
+  zone_name: 'Africa/Ouagadougou',
+  gmt_offset: [0, -364]
+};
+
+export const Pago_Pago: TimeZone = {
+  zone_name: 'Pacific/Pago_Pago',
+  gmt_offset: [45432, -39600, -40968]
+};
+
+export const Palau: TimeZone = {
+  zone_name: 'Pacific/Palau',
+  gmt_offset: [32400, 32276, -54124]
+};
+
+export const Palmer: TimeZone = {
+  zone_name: 'Antarctica/Palmer',
+  gmt_offset: [0, -7200, -10800, -14400]
+};
+
+export const Panama: TimeZone = {
+  zone_name: 'America/Panama',
+  gmt_offset: [-18000, -19088, -19176]
+};
+
+export const Paramaribo: TimeZone = {
+  zone_name: 'America/Paramaribo',
+  gmt_offset: [-10800, -12600, -13236, -13240, -13252]
+};
+
+export const Paris: TimeZone = {
+  zone_name: 'Europe/Paris',
+  gmt_offset: [7200, 3600, 561, 0]
+};
+
+export const Perth: TimeZone = {
+  zone_name: 'Australia/Perth',
+  gmt_offset: [32400, 28800, 27804]
+};
+
+export const Petersburg: TimeZone = {
+  zone_name: 'America/Indiana/Petersburg',
+  gmt_offset: [-14400, -18000, -20947, -21600]
+};
+
+export const Phnom_Penh: TimeZone = {
+  zone_name: 'Asia/Phnom_Penh',
+  gmt_offset: [32400, 28800, 25590, 25200, 25180]
+};
+
+export const Phoenix: TimeZone = {
+  zone_name: 'America/Phoenix',
+  gmt_offset: [-21600, -25200, -26898]
+};
+
+export const Pitcairn: TimeZone = {
+  zone_name: 'Pacific/Pitcairn',
+  gmt_offset: [-28800, -30600, -31220]
+};
+
+export const Podgorica: TimeZone = {
+  zone_name: 'Europe/Podgorica',
+  gmt_offset: [7200, 4920, 3600]
+};
+
+export const Pohnpei: TimeZone = {
+  zone_name: 'Pacific/Pohnpei',
+  gmt_offset: [39600, 37972, 36000, 32400, -48428]
+};
+
+export const Pontianak: TimeZone = {
+  zone_name: 'Asia/Pontianak',
+  gmt_offset: [32400, 28800, 27000, 26240, 25200]
+};
+
+export const Port_Moresby: TimeZone = {
+  zone_name: 'Pacific/Port_Moresby',
+  gmt_offset: [36000, 35320, 35312]
+};
+
+export const Port_of_Spain: TimeZone = {
+  zone_name: 'America/Port_of_Spain',
+  gmt_offset: [-14400, -14764]
+};
+
+export const Port_au_Prince: TimeZone = {
+  zone_name: 'America/Port-au-Prince',
+  gmt_offset: [-14400, -17340, -17360, -18000]
+};
+
+export const Porto_Velho: TimeZone = {
+  zone_name: 'America/Porto_Velho',
+  gmt_offset: [-10800, -14400, -15336]
+};
+
+export const Porto_Novo: TimeZone = {
+  zone_name: 'Africa/Porto-Novo',
+  gmt_offset: [3600, 628, 0]
+};
+
+export const Prague: TimeZone = {
+  zone_name: 'Europe/Prague',
+  gmt_offset: [7200, 3600, 3464, 0]
+};
+
+export const Puerto_Rico: TimeZone = {
+  zone_name: 'America/Puerto_Rico',
+  gmt_offset: [-10800, -14400, -15865]
+};
+
+export const Punta_Arenas: TimeZone = {
+  zone_name: 'America/Punta_Arenas',
+  gmt_offset: [-10800, -14400, -16965, -17020, -18000]
+};
+
+export const Pyongyang: TimeZone = {
+  zone_name: 'Asia/Pyongyang',
+  gmt_offset: [32400, 30600, 30180]
+};
+
+export const Qatar: TimeZone = {
+  zone_name: 'Asia/Qatar',
+  gmt_offset: [14400, 12368, 10800]
+};
+
+export const Qostanay: TimeZone = {
+  zone_name: 'Asia/Qostanay',
+  gmt_offset: [21600, 18000, 15268, 14400]
+};
+
+export const Qyzylorda: TimeZone = {
+  zone_name: 'Asia/Qyzylorda',
+  gmt_offset: [21600, 18000, 15712, 14400]
+};
+
+export const Rankin_Inlet: TimeZone = {
+  zone_name: 'America/Rankin_Inlet',
+  gmt_offset: [0, -18000, -21600]
+};
+
+export const Rarotonga: TimeZone = {
+  zone_name: 'Pacific/Rarotonga',
+  gmt_offset: [48056, -34200, -36000, -37800, -38344]
+};
+
+export const Recife: TimeZone = {
+  zone_name: 'America/Recife',
+  gmt_offset: [-7200, -8376, -10800]
+};
+
+export const Regina: TimeZone = {
+  zone_name: 'America/Regina',
+  gmt_offset: [-21600, -25116, -25200]
+};
+
+export const Resolute: TimeZone = {
+  zone_name: 'America/Resolute',
+  gmt_offset: [0, -18000, -21600]
+};
+
+export const Reunion: TimeZone = {
+  zone_name: 'Indian/Reunion',
+  gmt_offset: [14400, 13312]
+};
+
+export const Reykjavik: TimeZone = {
+  zone_name: 'Atlantic/Reykjavik',
+  gmt_offset: [0, -3600, -5280]
+};
+
+export const Riga: TimeZone = {
+  zone_name: 'Europe/Riga',
+  gmt_offset: [14400, 10800, 9394, 7200, 5794, 3600]
+};
+
+export const Rio_Branco: TimeZone = {
+  zone_name: 'America/Rio_Branco',
+  gmt_offset: [-14400, -16272, -18000]
+};
+
+export const Rio_Gallegos: TimeZone = {
+  zone_name: 'America/Argentina/Rio_Gallegos',
+  gmt_offset: [-7200, -10800, -14400, -15408, -16612]
+};
+
+export const Riyadh: TimeZone = {
+  zone_name: 'Asia/Riyadh',
+  gmt_offset: [11212, 10800]
+};
+
+export const Rome: TimeZone = {
+  zone_name: 'Europe/Rome',
+  gmt_offset: [7200, 3600, 2996]
+};
+
+export const Rothera: TimeZone = {
+  zone_name: 'Antarctica/Rothera',
+  gmt_offset: [0, -10800]
+};
+
+export const Saipan: TimeZone = {
+  zone_name: 'Pacific/Saipan',
+  gmt_offset: [39600, 36000, 34980, 32400, -51420]
+};
+
+export const Sakhalin: TimeZone = {
+  zone_name: 'Asia/Sakhalin',
+  gmt_offset: [43200, 39600, 36000, 34248, 32400]
+};
+
+export const Salta: TimeZone = {
+  zone_name: 'America/Argentina/Salta',
+  gmt_offset: [-7200, -10800, -14400, -15408, -15700]
+};
+
+export const Samara: TimeZone = {
+  zone_name: 'Europe/Samara',
+  gmt_offset: [18000, 14400, 12020, 10800]
+};
+
+export const Samarkand: TimeZone = {
+  zone_name: 'Asia/Samarkand',
+  gmt_offset: [21600, 18000, 16073, 14400]
+};
+
+export const San_Juan: TimeZone = {
+  zone_name: 'America/Argentina/San_Juan',
+  gmt_offset: [-7200, -10800, -14400, -15408, -16444]
+};
+
+export const San_Luis: TimeZone = {
+  zone_name: 'America/Argentina/San_Luis',
+  gmt_offset: [-7200, -10800, -14400, -15408, -15924]
+};
+
+export const San_Marino: TimeZone = {
+  zone_name: 'Europe/San_Marino',
+  gmt_offset: [7200, 3600, 2996]
+};
+
+export const Santarem: TimeZone = {
+  zone_name: 'America/Santarem',
+  gmt_offset: [-10800, -13128, -14400]
+};
+
+export const Santiago: TimeZone = {
+  zone_name: 'America/Santiago',
+  gmt_offset: [-10800, -14400, -16965, -18000]
+};
+
+export const Santo_Domingo: TimeZone = {
+  zone_name: 'America/Santo_Domingo',
+  gmt_offset: [-14400, -16200, -16776, -16800, -18000]
+};
+
+export const Sao_Paulo: TimeZone = {
+  zone_name: 'America/Sao_Paulo',
+  gmt_offset: [-7200, -10800, -11188]
+};
+
+export const Sao_Tome: TimeZone = {
+  zone_name: 'Africa/Sao_Tome',
+  gmt_offset: [3600, 1616, 0, -2205]
+};
+
+export const Sarajevo: TimeZone = {
+  zone_name: 'Europe/Sarajevo',
+  gmt_offset: [7200, 4420, 3600]
+};
+
+export const Saratov: TimeZone = {
+  zone_name: 'Europe/Saratov',
+  gmt_offset: [18000, 14400, 11058, 10800]
+};
+
+export const Scoresbysund: TimeZone = {
+  zone_name: 'America/Scoresbysund',
+  gmt_offset: [0, -3600, -5272, -7200]
+};
+
+export const Seoul: TimeZone = {
+  zone_name: 'Asia/Seoul',
+  gmt_offset: [36000, 34200, 32400, 30600, 30472]
+};
+
+export const Shanghai: TimeZone = {
+  zone_name: 'Asia/Shanghai',
+  gmt_offset: [32400, 29143, 28800]
+};
+
+export const Simferopol: TimeZone = {
+  zone_name: 'Europe/Simferopol',
+  gmt_offset: [14400, 10800, 8184, 8160, 7200, 3600]
+};
+
+export const Singapore: TimeZone = {
+  zone_name: 'Asia/Singapore',
+  gmt_offset: [32400, 28800, 27000, 26400, 25200, 24925]
+};
+
+export const Sitka: TimeZone = {
+  zone_name: 'America/Sitka',
+  gmt_offset: [53927, -25200, -28800, -32400, -32473]
+};
+
+export const Skopje: TimeZone = {
+  zone_name: 'Europe/Skopje',
+  gmt_offset: [7200, 5144, 3600]
+};
+
+export const Sofia: TimeZone = {
+  zone_name: 'Europe/Sofia',
+  gmt_offset: [10800, 7200, 7016, 5596, 3600]
+};
+
+export const South_Georgia: TimeZone = {
+  zone_name: 'Atlantic/South_Georgia',
+  gmt_offset: [-7200, -8768]
+};
+
+export const Srednekolymsk: TimeZone = {
+  zone_name: 'Asia/Srednekolymsk',
+  gmt_offset: [43200, 39600, 36892, 36000]
+};
+
+export const St_Barthelemy: TimeZone = {
+  zone_name: 'America/St_Barthelemy',
+  gmt_offset: [-10800, -14400, -15865]
+};
+
+export const St_Helena: TimeZone = {
+  zone_name: 'Atlantic/St_Helena',
+  gmt_offset: [0, -1368]
+};
+
+export const St_Johns: TimeZone = {
+  zone_name: 'America/St_Johns',
+  gmt_offset: [-5400, -9000, -9052, -12600, -12652]
+};
+
+export const St_Kitts: TimeZone = {
+  zone_name: 'America/St_Kitts',
+  gmt_offset: [-14400, -15052]
+};
+
+export const St_Lucia: TimeZone = {
+  zone_name: 'America/St_Lucia',
+  gmt_offset: [-14400, -14640]
+};
+
+export const St_Thomas: TimeZone = {
+  zone_name: 'America/St_Thomas',
+  gmt_offset: [-14400, -15584]
+};
+
+export const St_Vincent: TimeZone = {
+  zone_name: 'America/St_Vincent',
+  gmt_offset: [-14400, -14696]
+};
+
+export const Stanley: TimeZone = {
+  zone_name: 'Atlantic/Stanley',
+  gmt_offset: [-7200, -10800, -13884, -14400]
+};
+
+export const Stockholm: TimeZone = {
+  zone_name: 'Europe/Stockholm',
+  gmt_offset: [7200, 4332, 3614, 3600]
+};
+
+export const Swift_Current: TimeZone = {
+  zone_name: 'America/Swift_Current',
+  gmt_offset: [-21600, -25200, -25880]
+};
+
+export const Sydney: TimeZone = {
+  zone_name: 'Australia/Sydney',
+  gmt_offset: [39600, 36292, 36000]
+};
+
+export const Syowa: TimeZone = {
+  zone_name: 'Antarctica/Syowa',
+  gmt_offset: [10800, 0]
+};
+
+export const Tahiti: TimeZone = {
+  zone_name: 'Pacific/Tahiti',
+  gmt_offset: [-35896, -36000]
+};
+
+export const Taipei: TimeZone = {
+  zone_name: 'Asia/Taipei',
+  gmt_offset: [32400, 29160, 28800]
+};
+
+export const Tallinn: TimeZone = {
+  zone_name: 'Europe/Tallinn',
+  gmt_offset: [14400, 10800, 7200, 5940, 3600]
+};
+
+export const Tarawa: TimeZone = {
+  zone_name: 'Pacific/Tarawa',
+  gmt_offset: [43200, 41524]
+};
+
+export const Tashkent: TimeZone = {
+  zone_name: 'Asia/Tashkent',
+  gmt_offset: [25200, 21600, 18000, 16631]
+};
+
+export const Tbilisi: TimeZone = {
+  zone_name: 'Asia/Tbilisi',
+  gmt_offset: [18000, 14400, 10800, 10751]
+};
+
+export const Tegucigalpa: TimeZone = {
+  zone_name: 'America/Tegucigalpa',
+  gmt_offset: [-18000, -20932, -21600]
+};
+
+export const Tehran: TimeZone = {
+  zone_name: 'Asia/Tehran',
+  gmt_offset: [18000, 16200, 14400, 12600, 12344]
+};
+
+export const Tell_City: TimeZone = {
+  zone_name: 'America/Indiana/Tell_City',
+  gmt_offset: [-14400, -18000, -20823, -21600]
+};
+
+export const Thimphu: TimeZone = {
+  zone_name: 'Asia/Thimphu',
+  gmt_offset: [21600, 21516, 19800]
+};
+
+export const Thule: TimeZone = {
+  zone_name: 'America/Thule',
+  gmt_offset: [-10800, -14400, -16508]
+};
+
+export const Tijuana: TimeZone = {
+  zone_name: 'America/Tijuana',
+  gmt_offset: [-25200, -28084, -28800]
+};
+
+export const Tirane: TimeZone = {
+  zone_name: 'Europe/Tirane',
+  gmt_offset: [7200, 4760, 3600]
+};
+
+export const Tokyo: TimeZone = {
+  zone_name: 'Asia/Tokyo',
+  gmt_offset: [36000, 33539, 32400]
+};
+
+export const Tomsk: TimeZone = {
+  zone_name: 'Asia/Tomsk',
+  gmt_offset: [28800, 25200, 21600, 20391]
+};
+
+export const Tongatapu: TimeZone = {
+  zone_name: 'Pacific/Tongatapu',
+  gmt_offset: [50400, 46800, 44400, 44352]
+};
+
+export const Toronto: TimeZone = {
+  zone_name: 'America/Toronto',
+  gmt_offset: [-14400, -18000, -19052]
+};
+
+export const Tortola: TimeZone = {
+  zone_name: 'America/Tortola',
+  gmt_offset: [-14400, -15508]
+};
+
+export const Tripoli: TimeZone = {
+  zone_name: 'Africa/Tripoli',
+  gmt_offset: [7200, 3600, 3164]
+};
+
+export const Troll: TimeZone = {
+  zone_name: 'Antarctica/Troll',
+  gmt_offset: [7200, 0]
+};
+
+export const Tucuman: TimeZone = {
+  zone_name: 'America/Argentina/Tucuman',
+  gmt_offset: [-7200, -10800, -14400, -15408, -15652]
+};
+
+export const Tunis: TimeZone = {
+  zone_name: 'Africa/Tunis',
+  gmt_offset: [7200, 3600, 2444, 561]
+};
+
+export const Ulaanbaatar: TimeZone = {
+  zone_name: 'Asia/Ulaanbaatar',
+  gmt_offset: [32400, 28800, 25652, 25200]
+};
+
+export const Ulyanovsk: TimeZone = {
+  zone_name: 'Europe/Ulyanovsk',
+  gmt_offset: [18000, 14400, 11616, 10800, 7200]
+};
+
+export const Urumqi: TimeZone = {
+  zone_name: 'Asia/Urumqi',
+  gmt_offset: [21600, 21020]
+};
+
+export const Ushuaia: TimeZone = {
+  zone_name: 'America/Argentina/Ushuaia',
+  gmt_offset: [-7200, -10800, -14400, -15408, -16392]
+};
+
+export const Ust_Nera: TimeZone = {
+  zone_name: 'Asia/Ust-Nera',
+  gmt_offset: [43200, 39600, 36000, 34374, 32400, 28800]
+};
+
+export const Vaduz: TimeZone = {
+  zone_name: 'Europe/Vaduz',
+  gmt_offset: [7200, 3600, 2284]
+};
+
+export const Vancouver: TimeZone = {
+  zone_name: 'America/Vancouver',
+  gmt_offset: [-25200, -28800, -29548]
+};
+
+export const Vatican: TimeZone = {
+  zone_name: 'Europe/Vatican',
+  gmt_offset: [7200, 3600, 2996]
+};
+
+export const Vevay: TimeZone = {
+  zone_name: 'America/Indiana/Vevay',
+  gmt_offset: [-14400, -18000, -20416, -21600]
+};
+
+export const Vienna: TimeZone = {
+  zone_name: 'Europe/Vienna',
+  gmt_offset: [7200, 3921, 3600]
+};
+
+export const Vientiane: TimeZone = {
+  zone_name: 'Asia/Vientiane',
+  gmt_offset: [32400, 28800, 25590, 25200, 24624]
+};
+
+export const Vilnius: TimeZone = {
+  zone_name: 'Europe/Vilnius',
+  gmt_offset: [14400, 10800, 7200, 6076, 5736, 5040, 3600]
+};
+
+export const Vincennes: TimeZone = {
+  zone_name: 'America/Indiana/Vincennes',
+  gmt_offset: [-14400, -18000, -21007, -21600]
+};
+
+export const Vladivostok: TimeZone = {
+  zone_name: 'Asia/Vladivostok',
+  gmt_offset: [39600, 36000, 32400, 31651]
+};
+
+export const Volgograd: TimeZone = {
+  zone_name: 'Europe/Volgograd',
+  gmt_offset: [18000, 14400, 10800, 10660]
+};
+
+export const Vostok: TimeZone = {
+  zone_name: 'Antarctica/Vostok',
+  gmt_offset: [25200, 18000, 0]
+};
+
+export const Wake: TimeZone = {
+  zone_name: 'Pacific/Wake',
+  gmt_offset: [43200, 39988]
+};
+
+export const Wallis: TimeZone = {
+  zone_name: 'Pacific/Wallis',
+  gmt_offset: [44120, 43200]
+};
+
+export const Warsaw: TimeZone = {
+  zone_name: 'Europe/Warsaw',
+  gmt_offset: [10800, 7200, 5040, 3600]
+};
+
+export const Whitehorse: TimeZone = {
+  zone_name: 'America/Whitehorse',
+  gmt_offset: [-25200, -28800, -32400, -32412]
+};
+
+export const Winamac: TimeZone = {
+  zone_name: 'America/Indiana/Winamac',
+  gmt_offset: [-14400, -18000, -20785, -21600]
+};
+
+export const Windhoek: TimeZone = {
+  zone_name: 'Africa/Windhoek',
+  gmt_offset: [10800, 7200, 5400, 4104, 3600]
+};
+
+export const Winnipeg: TimeZone = {
+  zone_name: 'America/Winnipeg',
+  gmt_offset: [-18000, -21600, -23316]
+};
+
+export const Yakutat: TimeZone = {
+  zone_name: 'America/Yakutat',
+  gmt_offset: [52865, -28800, -32400, -33535]
+};
 
-export const isTimeZone = (timeZone?: TimeZone | 'UTC'): timeZone is TimeZone => {
-  return typeof timeZone === 'object' && 'zone_name' in timeZone && 'gmt_offset' in timeZone;
+export const Yakutsk: TimeZone = {
+  zone_name: 'Asia/Yakutsk',
+  gmt_offset: [36000, 32400, 31138, 28800]
 };
 
-export const isUTC = (timeZone?: TimeZone | 'UTC'): timeZone is 'UTC' => {
-  return timeZone === 'UTC';
+export const Yangon: TimeZone = {
+  zone_name: 'Asia/Yangon',
+  gmt_offset: [32400, 23400, 23087]
 };
 
-const getTimezoneOffset = (utcTime: number, timeZone: TimeZone): number => {
-  const utc = getDateTimeFormat('UTC');
-  const tz = getDateTimeFormat(timeZone.zone_name);
-  const offset = timeZone.gmt_offset;
+export const Yekaterinburg: TimeZone = {
+  zone_name: 'Asia/Yekaterinburg',
+  gmt_offset: [21600, 18000, 14553, 14400, 13505]
+};
 
-  // Try to find the correct offset by checking the current and previous days.
-  for (let i = 0; i < 2; i++) {
-    const targetString = utc.format(utcTime - i * 86400 * 1000);
+export const Yerevan: TimeZone = {
+  zone_name: 'Asia/Yerevan',
+  gmt_offset: [18000, 14400, 10800, 10680]
+};
 
-    for (let j = 0, len = offset.length; j < len; j++) {
-      if (tz.format(utcTime - (offset[j] + i * 86400) * 1000) === targetString) {
-        return offset[j];
-      }
-    }
-  }
-  return NaN;
+export const Zagreb: TimeZone = {
+  zone_name: 'Europe/Zagreb',
+  gmt_offset: [7200, 3832, 3600]
 };
 
-export const createTimezoneDate = (utcTime: number, timeZone: TimeZone) => new Date(utcTime - getTimezoneOffset(utcTime, timeZone) * 1000);
+export const Zurich: TimeZone = {
+  zone_name: 'Europe/Zurich',
+  gmt_offset: [7200, 3600, 2048, 1786]
+};
diff --git a/src/zone.ts b/src/zone.ts
new file mode 100644
index 0000000..f1e07fb
--- /dev/null
+++ b/src/zone.ts
@@ -0,0 +1,34 @@
+import { getDateTimeFormat } from './dtf.ts';
+
+export interface TimeZone {
+  zone_name: string;
+  gmt_offset: number[];
+}
+
+export const isTimeZone = (timeZone: unknown): timeZone is TimeZone => {
+  return !!timeZone && typeof timeZone === 'object' && 'zone_name' in timeZone && 'gmt_offset' in timeZone;
+};
+
+export const isUTC = (timeZone: unknown): timeZone is 'UTC' => {
+  return typeof timeZone === 'string' && timeZone.toUpperCase() === 'UTC';
+};
+
+const getTimezoneOffset = (utcTime: number, timeZone: TimeZone): number => {
+  const utc = getDateTimeFormat('UTC');
+  const tz = getDateTimeFormat(timeZone.zone_name);
+  const offset = timeZone.gmt_offset;
+
+  // Try to find the correct offset by checking the current and previous days.
+  for (let i = 0; i < 2; i++) {
+    const targetString = utc.format(utcTime - i * 86400 * 1000);
+
+    for (let j = 0, len = offset.length; j < len; j++) {
+      if (tz.format(utcTime - (offset[j] + i * 86400) * 1000) === targetString) {
+        return offset[j];
+      }
+    }
+  }
+  return NaN;
+};
+
+export const createTimezoneDate = (utcTime: number, timeZone: TimeZone) => new Date(utcTime - getTimezoneOffset(utcTime, timeZone) * 1000);
diff --git a/src/zonenames.ts b/src/zonenames.ts
index e1d5478..d630fae 100644
--- a/src/zonenames.ts
+++ b/src/zonenames.ts
@@ -189,8 +189,8 @@ export default {
   'Pohnpei Time': 'PONT',
   'Qyzylorda Standard Time': 'QYZT',
   'Qyzylorda Summer Time': 'QYZST',
-  'Rothera Time': 'ROTT',
   'Réunion Time': 'RET',
+  'Rothera Time': 'ROTT',
   'Sakhalin Standard Time': 'SAKT',
   'Sakhalin Summer Time': 'SAKST',
   'Samara Standard Time': 'SAMT',
diff --git a/tests/format.spec.ts b/tests/format.spec.ts
index e3c22c4..d0efb11 100644
--- a/tests/format.spec.ts
+++ b/tests/format.spec.ts
@@ -2,6 +2,7 @@ import { describe, expect, test, beforeAll } from 'vitest';
 import { format, compile } from '@/index.ts';
 import Los_Angeles from '@/timezones/America/Los_Angeles.ts';
 import Tokyo from '@/timezones/Asia/Tokyo.ts';
+import { Los_Angeles as los_angeles, Tokyo as tokyo } from '@/timezone.ts';
 
 describe('YYYY', () => {
   beforeAll(() => (process.env.TZ = 'UTC'));
@@ -750,7 +751,11 @@ describe('options', () => {
   test('timeZone', () => {
     const now = new Date(2025, 1 - 1, 1, 0);
     expect(format(now, 'YYYY-MM-DD HH:mm:ss.SSS Z dd', { timeZone: Los_Angeles })).toBe('2024-12-31 16:00:00.000 -0800 Tu');
+    expect(format(now, 'YYYY-MM-DD HH:mm:ss.SSS Z dd', { timeZone: los_angeles })).toBe('2024-12-31 16:00:00.000 -0800 Tu');
+    expect(format(now, 'YYYY-MM-DD HH:mm:ss.SSS Z dd', { timeZone: 'America/Los_Angeles' })).toBe('2024-12-31 16:00:00.000 -0800 Tu');
     expect(format(now, 'YYYY-MM-DD HH:mm:ss.SSS Z dd', { timeZone: Tokyo })).toBe('2025-01-01 09:00:00.000 +0900 We');
+    expect(format(now, 'YYYY-MM-DD HH:mm:ss.SSS Z dd', { timeZone: tokyo })).toBe('2025-01-01 09:00:00.000 +0900 We');
+    expect(format(now, 'YYYY-MM-DD HH:mm:ss.SSS Z dd', { timeZone: 'Asia/Tokyo' })).toBe('2025-01-01 09:00:00.000 +0900 We');
     expect(format(now, 'YYYY-MM-DD HH:mm:ss.SSS Z dd', { timeZone: 'UTC' })).toBe('2025-01-01 00:00:00.000 +0000 We');
   });
 });
diff --git a/tests/parse.spec.ts b/tests/parse.spec.ts
index f547027..4f9f731 100644
--- a/tests/parse.spec.ts
+++ b/tests/parse.spec.ts
@@ -5,6 +5,7 @@ import Los_Angeles from '@/timezones/America/Los_Angeles.ts';
 import Tokyo from '@/timezones/Asia/Tokyo.ts';
 import Adelaide from '@/timezones/Australia/Adelaide.ts';
 import Apia from '@/timezones/Pacific/Apia.ts';
+import { Los_Angeles as los_angeles, Tokyo as tokyo, Adelaide as adelaide, Apia as apia } from '@/timezone.ts';
 
 test('YYYY', () => {
   expect(Number.isNaN(parse('0000', 'YYYY').getTime())).toBe(true);
@@ -532,7 +533,9 @@ describe('options', () => {
   test('timeZone', () => {
     const now = new Date(Date.UTC(2025, 1 - 1, 1, 0));
     expect(parse('2024-12-31 16:00:00', 'YYYY-MM-DD HH:mm:ss', { timeZone: Los_Angeles })).toEqual(now);
+    expect(parse('2024-12-31 16:00:00', 'YYYY-MM-DD HH:mm:ss', { timeZone: los_angeles })).toEqual(now);
     expect(parse('2025-01-01 09:00:00', 'YYYY-MM-DD HH:mm:ss', { timeZone: Tokyo })).toEqual(now);
+    expect(parse('2025-01-01 09:00:00', 'YYYY-MM-DD HH:mm:ss', { timeZone: tokyo })).toEqual(now);
     expect(parse('2025-01-01 00:00:00', 'YYYY-MM-DD HH:mm:ss', { timeZone: 'UTC' })).toEqual(now);
 
     const dummyTimeZone = {
@@ -548,31 +551,37 @@ describe('timeZone Los_Angeles', () => {
   test('before DST', () => {
     const now = new Date('2021-03-14T09:59:59.999Z');
     expect(parse('2021-03-14 01:59:59.999', 'YYYY-MM-DD HH:mm:ss.SSS', { timeZone: Los_Angeles })).toEqual(now);
+    expect(parse('2021-03-14 01:59:59.999', 'YYYY-MM-DD HH:mm:ss.SSS', { timeZone: los_angeles })).toEqual(now);
   });
 
   test('start DST 1', () => {
     const now = new Date('2021-03-14T10:00:00.000Z');
     expect(parse('2021-03-14 02:00:00.000', 'YYYY-MM-DD HH:mm:ss.SSS', { timeZone: Los_Angeles })).toEqual(now);
+    expect(parse('2021-03-14 02:00:00.000', 'YYYY-MM-DD HH:mm:ss.SSS', { timeZone: los_angeles })).toEqual(now);
   });
 
   test('start DST 2', () => {
     const now = new Date('2021-03-14T10:00:00.000Z');
     expect(parse('2021-03-14 03:00:00.000', 'YYYY-MM-DD HH:mm:ss.SSS', { timeZone: Los_Angeles })).toEqual(now);
+    expect(parse('2021-03-14 03:00:00.000', 'YYYY-MM-DD HH:mm:ss.SSS', { timeZone: los_angeles })).toEqual(now);
   });
 
   test('before of PST', () => {
     const now = new Date('2021-11-07T08:59:59.999Z');
     expect(parse('2021-11-07 01:59:59.999', 'YYYY-MM-DD HH:mm:ss.SSS', { timeZone: Los_Angeles })).toEqual(now);
+    expect(parse('2021-11-07 01:59:59.999', 'YYYY-MM-DD HH:mm:ss.SSS', { timeZone: los_angeles })).toEqual(now);
   });
 
   test('end of DST', () => {
     const now = new Date('2021-11-07T10:00:00.000Z');
     expect(parse('2021-11-07 02:00:00.000', 'YYYY-MM-DD HH:mm:ss.SSS', { timeZone: Los_Angeles })).toEqual(now);
+    expect(parse('2021-11-07 02:00:00.000', 'YYYY-MM-DD HH:mm:ss.SSS', { timeZone: los_angeles })).toEqual(now);
   });
 
   test('after of DST', () => {
     const now = new Date('2021-11-07T11:00:00.000Z');
     expect(parse('2021-11-07 03:00:00.000', 'YYYY-MM-DD HH:mm:ss.SSS', { timeZone: Los_Angeles })).toEqual(now);
+    expect(parse('2021-11-07 03:00:00.000', 'YYYY-MM-DD HH:mm:ss.SSS', { timeZone: los_angeles })).toEqual(now);
   });
 });
 
@@ -584,6 +593,7 @@ describe('timeZone Adelaide', () => {
     const dateObj = new Date(Date.UTC(2021, 9, 2, 16, 29, 59, 999));
 
     expect(parse(dateString, formatString, { timeZone: Adelaide }).getTime()).toBe(dateObj.getTime());
+    expect(parse(dateString, formatString, { timeZone: adelaide }).getTime()).toBe(dateObj.getTime());
   });
 
   test('start of DST 1', () => {
@@ -593,6 +603,7 @@ describe('timeZone Adelaide', () => {
     const dateObj = new Date(Date.UTC(2021, 9, 2, 16, 30, 0, 0));
 
     expect(parse(dateString, formatString, { timeZone: Adelaide }).getTime()).toBe(dateObj.getTime());
+    expect(parse(dateString, formatString, { timeZone: adelaide }).getTime()).toBe(dateObj.getTime());
   });
 
   test('start of DST 2', () => {
@@ -602,6 +613,7 @@ describe('timeZone Adelaide', () => {
     const dateObj = new Date(Date.UTC(2021, 9, 2, 17, 29, 59, 999));
 
     expect(parse(dateString, formatString, { timeZone: Adelaide }).getTime()).toBe(dateObj.getTime());
+    expect(parse(dateString, formatString, { timeZone: adelaide }).getTime()).toBe(dateObj.getTime());
   });
 
   test('start of DST 3', () => {
@@ -611,6 +623,7 @@ describe('timeZone Adelaide', () => {
     const dateObj = new Date(Date.UTC(2021, 9, 2, 16, 30, 0, 0));
 
     expect(parse(dateString, formatString, { timeZone: Adelaide }).getTime()).toBe(dateObj.getTime());
+    expect(parse(dateString, formatString, { timeZone: adelaide }).getTime()).toBe(dateObj.getTime());
   });
 
   test('end of DST', () => {
@@ -620,6 +633,7 @@ describe('timeZone Adelaide', () => {
     const dateObj = new Date(Date.UTC(2021, 3, 3, 16, 29, 59, 999));
 
     expect(parse(dateString, formatString, { timeZone: Adelaide }).getTime()).toBe(dateObj.getTime());
+    expect(parse(dateString, formatString, { timeZone: adelaide }).getTime()).toBe(dateObj.getTime());
   });
 
   test('after DST', () => {
@@ -629,6 +643,7 @@ describe('timeZone Adelaide', () => {
     const dateObj = new Date(Date.UTC(2021, 3, 3, 17, 30, 0, 0));
 
     expect(parse(dateString, formatString, { timeZone: Adelaide }).getTime()).toBe(dateObj.getTime());
+    expect(parse(dateString, formatString, { timeZone: adelaide }).getTime()).toBe(dateObj.getTime());
   });
 });
 
@@ -641,6 +656,7 @@ describe('timeZone Apia', () => {
     const dateObj = new Date(1892, 7 - 1, 4, 23, 59, 59);
 
     expect(parse(dateString, formatString, { timeZone: Apia }).getTime()).toBe(dateObj.getTime());
+    expect(parse(dateString, formatString, { timeZone: apia }).getTime()).toBe(dateObj.getTime());
   });
 
   test('1.2', () => {
@@ -649,6 +665,7 @@ describe('timeZone Apia', () => {
     const dateObj = new Date(1892, 7 - 1, 4, 0, 0, 0);
 
     expect(parse(dateString, formatString, { timeZone: Apia }).getTime()).toBe(dateObj.getTime());
+    expect(parse(dateString, formatString, { timeZone: apia }).getTime()).toBe(dateObj.getTime());
   });
 
   test('2.1', () => {
@@ -657,6 +674,7 @@ describe('timeZone Apia', () => {
     const dateObj = new Date(1910, 12 - 1, 31, 23, 59, 59);
 
     expect(parse(dateString, formatString, { timeZone: Apia }).getTime()).toBe(dateObj.getTime());
+    expect(parse(dateString, formatString, { timeZone: apia }).getTime()).toBe(dateObj.getTime());
   });
 
   test('2.2', () => {
@@ -665,6 +683,7 @@ describe('timeZone Apia', () => {
     const dateObj = new Date(1910, 12 - 1, 31, 23, 56, 56);
 
     expect(parse(dateString, formatString, { timeZone: Apia }).getTime()).toBe(dateObj.getTime());
+    expect(parse(dateString, formatString, { timeZone: apia }).getTime()).toBe(dateObj.getTime());
   });
 
   test('3.1', () => {
@@ -673,6 +692,7 @@ describe('timeZone Apia', () => {
     const dateObj = new Date(1949, 12 - 1, 31, 23, 59, 59);
 
     expect(parse(dateString, formatString, { timeZone: Apia }).getTime()).toBe(dateObj.getTime());
+    expect(parse(dateString, formatString, { timeZone: apia }).getTime()).toBe(dateObj.getTime());
   });
 
   test('3.2', () => {
@@ -681,6 +701,7 @@ describe('timeZone Apia', () => {
     const dateObj = new Date(1950, 1 - 1, 1, 0, 30, 0);
 
     expect(parse(dateString, formatString, { timeZone: Apia }).getTime()).toBe(dateObj.getTime());
+    expect(parse(dateString, formatString, { timeZone: apia }).getTime()).toBe(dateObj.getTime());
   });
 
   test('4.1', () => {
@@ -689,6 +710,7 @@ describe('timeZone Apia', () => {
     const dateObj = new Date(2010, 9 - 1, 25, 23, 59, 59);
 
     expect(parse(dateString, formatString, { timeZone: Apia }).getTime()).toBe(dateObj.getTime());
+    expect(parse(dateString, formatString, { timeZone: apia }).getTime()).toBe(dateObj.getTime());
   });
 
   test('4.2', () => {
@@ -697,6 +719,7 @@ describe('timeZone Apia', () => {
     const dateObj = new Date(2010, 9 - 1, 26, 1, 0, 0);
 
     expect(parse(dateString, formatString, { timeZone: Apia }).getTime()).toBe(dateObj.getTime());
+    expect(parse(dateString, formatString, { timeZone: apia }).getTime()).toBe(dateObj.getTime());
   });
 
   test('5.1', () => {
@@ -705,6 +728,7 @@ describe('timeZone Apia', () => {
     const dateObj = new Date(2011, 4 - 1, 2, 3, 59, 59);
 
     expect(parse(dateString, formatString, { timeZone: Apia }).getTime()).toBe(dateObj.getTime());
+    expect(parse(dateString, formatString, { timeZone: apia }).getTime()).toBe(dateObj.getTime());
   });
 
   test('5.2', () => {
@@ -713,6 +737,7 @@ describe('timeZone Apia', () => {
     const dateObj = new Date(2011, 4 - 1, 2, 3, 0, 0);
 
     expect(parse(dateString, formatString, { timeZone: Apia }).getTime()).toBe(dateObj.getTime());
+    expect(parse(dateString, formatString, { timeZone: apia }).getTime()).toBe(dateObj.getTime());
   });
 
   test('6.1', () => {
@@ -721,6 +746,7 @@ describe('timeZone Apia', () => {
     const dateObj = new Date(2011, 9 - 1, 24, 2, 59, 59);
 
     expect(parse(dateString, formatString, { timeZone: Apia }).getTime()).toBe(dateObj.getTime());
+    expect(parse(dateString, formatString, { timeZone: apia }).getTime()).toBe(dateObj.getTime());
   });
 
   test('6.2', () => {
@@ -729,6 +755,7 @@ describe('timeZone Apia', () => {
     const dateObj = new Date(2011, 9 - 1, 24, 4, 0, 0);
 
     expect(parse(dateString, formatString, { timeZone: Apia }).getTime()).toBe(dateObj.getTime());
+    expect(parse(dateString, formatString, { timeZone: apia }).getTime()).toBe(dateObj.getTime());
   });
 
   test('7.1', () => {
@@ -737,6 +764,7 @@ describe('timeZone Apia', () => {
     const dateObj = new Date(2011, 12 - 1, 29, 23, 59, 59);
 
     expect(parse(dateString, formatString, { timeZone: Apia }).getTime()).toBe(dateObj.getTime());
+    expect(parse(dateString, formatString, { timeZone: apia }).getTime()).toBe(dateObj.getTime());
   });
 
   test('7.2', () => {
@@ -745,6 +773,7 @@ describe('timeZone Apia', () => {
     const dateObj = new Date(2011, 12 - 1, 31, 0, 0, 0);
 
     expect(parse(dateString, formatString, { timeZone: Apia }).getTime()).toBe(dateObj.getTime());
+    expect(parse(dateString, formatString, { timeZone: apia }).getTime()).toBe(dateObj.getTime());
   });
 
   test('8.1', () => {
@@ -753,6 +782,7 @@ describe('timeZone Apia', () => {
     const dateObj = new Date(2012, 4 - 1, 1, 3, 59, 59);
 
     expect(parse(dateString, formatString, { timeZone: Apia }).getTime()).toBe(dateObj.getTime());
+    expect(parse(dateString, formatString, { timeZone: apia }).getTime()).toBe(dateObj.getTime());
   });
 
   test('8.2', () => {
@@ -761,5 +791,6 @@ describe('timeZone Apia', () => {
     const dateObj = new Date(2012, 4 - 1, 1, 3, 0, 0);
 
     expect(parse(dateString, formatString, { timeZone: Apia }).getTime()).toBe(dateObj.getTime());
+    expect(parse(dateString, formatString, { timeZone: apia }).getTime()).toBe(dateObj.getTime());
   });
 });
diff --git a/tests/timezones/timezones.spec.ts b/tests/timezones/timezones.spec.ts
index ea45561..e3f669a 100644
--- a/tests/timezones/timezones.spec.ts
+++ b/tests/timezones/timezones.spec.ts
@@ -1,7 +1,7 @@
 import { expect, test, describe } from 'vitest';
 import { readdir } from 'node:fs/promises';
 import { join } from 'node:path';
-import type { TimeZone } from '@/timezone.ts';
+import type { TimeZone } from '@/zone.ts';
 
 const importModules = async (path: string) => {
   const items = await readdir(path, { recursive: true, withFileTypes: true });
diff --git a/tools/timezone.ts b/tools/timezone.ts
index d790ad4..1301dc7 100644
--- a/tools/timezone.ts
+++ b/tools/timezone.ts
@@ -1,14 +1,13 @@
 /**
  * @description
- * This script extracts GMT offset values from a CSV file obtained from timezonedb.com,
- * creates subdirectories for each timezone under the src/timezones directory,
- * and outputs timezone data as TypeScript files.
+ * This script generates timezone data files from a CSV file obtained from timezonedb.com,
+ * creates individual timezone files, and an integrated timezone file for easier imports.
  */
 
 import { readFile, mkdir, writeFile } from 'node:fs/promises';
 import { join } from 'node:path';
 import prettier from 'prettier';
-import type { TimeZone } from '@/timezone.ts';
+import type { TimeZone } from '@/zone.ts';
 
 const createTimeZones = (csv: string) => {
   const map = new Map<string, TimeZone>();
@@ -35,7 +34,7 @@ const getPath = (timezone: TimeZone) => {
   const re = /[^/]+$/;
   return {
     dir: join('src', 'timezones', timezone.zone_name.replace(re, '')),
-    name: `${re.exec(timezone.zone_name)?.[0] ?? ''}.ts`
+    name: re.exec(timezone.zone_name)?.[0] ?? ''
   };
 };
 
@@ -47,6 +46,26 @@ const format = (timezone: TimeZone) => {
   return prettier.format(code, { parser: 'typescript', singleQuote: true, trailingComma: 'none' });
 };
 
+const sortMap = (map: Map<string, TimeZone>) => {
+  return Array.from(map.values()).sort((a, b) => getPath(a).name.localeCompare(getPath(b).name));
+};
+
+const formatAll = (map: Map<string, TimeZone>) => {
+  const code = [];
+
+  code.push('import { TimeZone } from \'@/zone.ts\';');
+
+  for (const timezone of sortMap(map)) {
+    const name = getPath(timezone).name.replace(/-/g, '_');
+
+    code.push(`export const ${name}: TimeZone = {
+      zone_name: '${timezone.zone_name}',
+      gmt_offset: ${JSON.stringify(timezone.gmt_offset.sort((a, b) => b - a))}
+    };`);
+  }
+  return prettier.format(code.join('\n\n'), { parser: 'typescript', singleQuote: true, trailingComma: 'none' });
+};
+
 const path = process.argv[2];
 
 if (!path) {
@@ -57,9 +76,13 @@ if (!path) {
 const csv = await readFile(path, 'utf8');
 const map = createTimeZones(csv);
 
+// Generate individual timezone files
 for (const timezone of map.values()) {
   const { dir, name } = getPath(timezone);
 
   await mkdir(dir, { recursive: true });
-  await writeFile(join(dir, name), await format(timezone));
+  await writeFile(join(dir, `${name}.ts`), await format(timezone));
 }
+
+// Generate integrated timezone file
+await writeFile(join('src', 'timezone.ts'), await formatAll(map));