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Merge pull request #193 from cloud-atlas-ai/fix-microsoft-timezone-parsing
Support Windows Timezones
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‎package.json‎

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"version": "node version-bump.mjs && git add manifest.json versions.json",
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"test": "jest",
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"test:watch": "jest --watch",
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"test:coverage": "jest --coverage"
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"test:coverage": "jest --coverage",
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"update-timezones": "node scripts/update-timezones.js"
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},
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"keywords": [],
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"author": "",

‎scripts/update-timezones.js‎

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#!/usr/bin/env node
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/**
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* Script to update Windows to IANA timezone mappings from Unicode CLDR data
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*
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* Usage: node scripts/update-timezones.js
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*
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* This script fetches the latest windowsZones.xml from Unicode CLDR project
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* and updates the timezone mapping in src/icalUtils.ts
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*/
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const https = require('https');
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const fs = require('fs');
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const path = require('path');
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const CLDR_URL = 'https://raw.githubusercontent.com/unicode-org/cldr/main/common/supplemental/windowsZones.xml';
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const OUTPUT_TS_FILE = path.join(__dirname, '..', 'src', 'generated', 'windowsTimezones.ts');
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const OUTPUT_JSON_FILE = path.join(__dirname, '..', 'src', 'generated', 'windows-to-iana.json');
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const OUTPUT_YAML_FILE = path.join(__dirname, '..', 'src', 'generated', 'windows-to-iana.yaml');
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console.log('Fetching Windows timezone mappings from Unicode CLDR...');
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https.get(CLDR_URL, (res) => {
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let data = '';
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res.on('data', (chunk) => {
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data += chunk;
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});
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res.on('end', () => {
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try {
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const mappings = parseWindowsZones(data);
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// Ensure output directory exists
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const generatedDir = path.dirname(OUTPUT_TS_FILE);
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if (!fs.existsSync(generatedDir)) {
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fs.mkdirSync(generatedDir, { recursive: true });
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}
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generateTypeScriptFile(mappings);
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generateJsonFile(mappings);
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generateYamlFile(mappings);
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console.log(`✅ Successfully updated ${Object.keys(mappings).length} timezone mappings`);
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console.log(`📁 TypeScript: ${OUTPUT_TS_FILE}`);
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console.log(`📁 JSON: ${OUTPUT_JSON_FILE}`);
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console.log(`📁 YAML: ${OUTPUT_YAML_FILE}`);
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} catch (error) {
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console.error('❌ Error parsing timezone data:', error.message);
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process.exit(1);
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}
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});
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}).on('error', (err) => {
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console.error('❌ Error fetching timezone data:', err.message);
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process.exit(1);
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});
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function parseWindowsZones(xmlData) {
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const mappings = {};
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// Extract mapZone elements with territory="001" (primary mappings)
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const mapZoneRegex = /<mapZone[^>]*other="([^"]*)"[^>]*territory="001"[^>]*type="([^"]*)"/g;
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let match;
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while ((match = mapZoneRegex.exec(xmlData)) !== null) {
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const windowsZone = match[1];
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const ianaZone = match[2];
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// Take the first IANA zone if multiple are specified
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const primaryIanaZone = ianaZone.split(' ')[0];
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mappings[windowsZone] = primaryIanaZone;
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}
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return mappings;
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}
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function generateTypeScriptFile(mappings) {
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const timestamp = new Date().toISOString();
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const content = `/**
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* Windows to IANA timezone mappings
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*
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* Generated from Unicode CLDR windowsZones.xml
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* Last updated: ${timestamp}
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* Source: https://github.com/unicode-org/cldr/blob/main/common/supplemental/windowsZones.xml
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*
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* To update this file, run: node scripts/update-timezones.js
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*/
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export const WINDOWS_TO_IANA_TIMEZONES: Record<string, string> = ${JSON.stringify(mappings, null, 2)};
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/**
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* Get IANA timezone identifier for a Windows timezone name
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* @param windowsTimezone Windows timezone name (e.g., "Eastern Standard Time")
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* @returns IANA timezone identifier (e.g., "America/New_York") or undefined if not found
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*/
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export function getIanaTimezone(windowsTimezone: string): string | undefined {
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return WINDOWS_TO_IANA_TIMEZONES[windowsTimezone];
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}
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/**
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* Get all supported Windows timezone names
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* @returns Array of Windows timezone names
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*/
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export function getSupportedWindowsTimezones(): string[] {
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return Object.keys(WINDOWS_TO_IANA_TIMEZONES);
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}
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`;
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fs.writeFileSync(OUTPUT_TS_FILE, content, 'utf8');
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}
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function generateJsonFile(mappings) {
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const timestamp = new Date().toISOString();
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const jsonData = {
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metadata: {
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description: "Windows to IANA timezone mappings",
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source: "Unicode CLDR windowsZones.xml",
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sourceUrl: "https://github.com/unicode-org/cldr/blob/main/common/supplemental/windowsZones.xml",
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lastUpdated: timestamp,
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updateCommand: "node scripts/update-timezones.js",
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totalMappings: Object.keys(mappings).length
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},
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mappings: mappings
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};
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fs.writeFileSync(OUTPUT_JSON_FILE, JSON.stringify(jsonData, null, 2), 'utf8');
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}
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function generateYamlFile(mappings) {
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const timestamp = new Date().toISOString();
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let yamlContent = `# Windows to IANA timezone mappings
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#
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# Generated from Unicode CLDR windowsZones.xml
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# Last updated: ${timestamp}
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# Source: https://github.com/unicode-org/cldr/blob/main/common/supplemental/windowsZones.xml
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#
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# To update this file, run: node scripts/update-timezones.js
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metadata:
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description: "Windows to IANA timezone mappings"
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source: "Unicode CLDR windowsZones.xml"
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sourceUrl: "https://github.com/unicode-org/cldr/blob/main/common/supplemental/windowsZones.xml"
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lastUpdated: "${timestamp}"
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updateCommand: "node scripts/update-timezones.js"
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totalMappings: ${Object.keys(mappings).length}
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mappings:
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`;
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// Convert mappings to YAML format
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for (const [windowsZone, ianaZone] of Object.entries(mappings)) {
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yamlContent += ` "${windowsZone}": "${ianaZone}"\n`;
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}
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fs.writeFileSync(OUTPUT_YAML_FILE, yamlContent, 'utf8');
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}

‎src/generated/windows-to-iana.json‎

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{
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"metadata": {
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"description": "Windows to IANA timezone mappings",
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"source": "Unicode CLDR windowsZones.xml",
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"sourceUrl": "https://github.com/unicode-org/cldr/blob/main/common/supplemental/windowsZones.xml",
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"lastUpdated": "2025-09-23T01:28:13.315Z",
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"updateCommand": "node scripts/update-timezones.js",
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"totalMappings": 139
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},
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"mappings": {
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"Dateline Standard Time": "Etc/GMT+12",
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"UTC-11": "Etc/GMT+11",
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"Aleutian Standard Time": "America/Adak",
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"Hawaiian Standard Time": "Pacific/Honolulu",
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"Marquesas Standard Time": "Pacific/Marquesas",
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"Alaskan Standard Time": "America/Anchorage",
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"UTC-09": "Etc/GMT+9",
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"Pacific Standard Time (Mexico)": "America/Tijuana",
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"UTC-08": "Etc/GMT+8",
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"Pacific Standard Time": "America/Los_Angeles",
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"US Mountain Standard Time": "America/Phoenix",
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"Mountain Standard Time (Mexico)": "America/Mazatlan",
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"Mountain Standard Time": "America/Denver",
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"Yukon Standard Time": "America/Whitehorse",
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"Central America Standard Time": "America/Guatemala",
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"Central Standard Time": "America/Chicago",
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"Easter Island Standard Time": "Pacific/Easter",
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"Central Standard Time (Mexico)": "America/Mexico_City",
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"Canada Central Standard Time": "America/Regina",
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"SA Pacific Standard Time": "America/Bogota",
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"Eastern Standard Time (Mexico)": "America/Cancun",
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"Eastern Standard Time": "America/New_York",
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"Haiti Standard Time": "America/Port-au-Prince",
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"Cuba Standard Time": "America/Havana",
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"US Eastern Standard Time": "America/Indianapolis",
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"Turks And Caicos Standard Time": "America/Grand_Turk",
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"Paraguay Standard Time": "America/Asuncion",
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"Atlantic Standard Time": "America/Halifax",
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"Venezuela Standard Time": "America/Caracas",
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"Central Brazilian Standard Time": "America/Cuiaba",
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"SA Western Standard Time": "America/La_Paz",
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"Pacific SA Standard Time": "America/Santiago",
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"Newfoundland Standard Time": "America/St_Johns",
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"Tocantins Standard Time": "America/Araguaina",
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"E. South America Standard Time": "America/Sao_Paulo",
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"SA Eastern Standard Time": "America/Cayenne",
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"Argentina Standard Time": "America/Buenos_Aires",
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"Greenland Standard Time": "America/Godthab",
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"Montevideo Standard Time": "America/Montevideo",
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"Magallanes Standard Time": "America/Punta_Arenas",
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"Saint Pierre Standard Time": "America/Miquelon",
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"Bahia Standard Time": "America/Bahia",
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"UTC-02": "Etc/GMT+2",
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"Azores Standard Time": "Atlantic/Azores",
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"Cape Verde Standard Time": "Atlantic/Cape_Verde",
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"UTC": "Etc/UTC",
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"GMT Standard Time": "Europe/London",
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"Greenwich Standard Time": "Atlantic/Reykjavik",
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"Sao Tome Standard Time": "Africa/Sao_Tome",
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"Morocco Standard Time": "Africa/Casablanca",
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"W. Europe Standard Time": "Europe/Berlin",
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"Central Europe Standard Time": "Europe/Budapest",
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"Romance Standard Time": "Europe/Paris",
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"Central European Standard Time": "Europe/Warsaw",
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"W. Central Africa Standard Time": "Africa/Lagos",
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"Jordan Standard Time": "Asia/Amman",
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"GTB Standard Time": "Europe/Bucharest",
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"Middle East Standard Time": "Asia/Beirut",
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"Egypt Standard Time": "Africa/Cairo",
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"E. Europe Standard Time": "Europe/Chisinau",
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"Syria Standard Time": "Asia/Damascus",
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"West Bank Standard Time": "Asia/Hebron",
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"South Africa Standard Time": "Africa/Johannesburg",
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"FLE Standard Time": "Europe/Kiev",
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"Israel Standard Time": "Asia/Jerusalem",
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"South Sudan Standard Time": "Africa/Juba",
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"Kaliningrad Standard Time": "Europe/Kaliningrad",
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"Sudan Standard Time": "Africa/Khartoum",
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"Libya Standard Time": "Africa/Tripoli",
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"Namibia Standard Time": "Africa/Windhoek",
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"Arabic Standard Time": "Asia/Baghdad",
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"Turkey Standard Time": "Europe/Istanbul",
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"Arab Standard Time": "Asia/Riyadh",
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"Belarus Standard Time": "Europe/Minsk",
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"Russian Standard Time": "Europe/Moscow",
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"E. Africa Standard Time": "Africa/Nairobi",
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"Iran Standard Time": "Asia/Tehran",
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"Arabian Standard Time": "Asia/Dubai",
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"Astrakhan Standard Time": "Europe/Astrakhan",
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"Azerbaijan Standard Time": "Asia/Baku",
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"Russia Time Zone 3": "Europe/Samara",
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"Mauritius Standard Time": "Indian/Mauritius",
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"Saratov Standard Time": "Europe/Saratov",
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"Georgian Standard Time": "Asia/Tbilisi",
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"Volgograd Standard Time": "Europe/Volgograd",
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"Caucasus Standard Time": "Asia/Yerevan",
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"Afghanistan Standard Time": "Asia/Kabul",
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"West Asia Standard Time": "Asia/Tashkent",
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"Ekaterinburg Standard Time": "Asia/Yekaterinburg",
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"Pakistan Standard Time": "Asia/Karachi",
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"Qyzylorda Standard Time": "Asia/Qyzylorda",
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"India Standard Time": "Asia/Calcutta",
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"Sri Lanka Standard Time": "Asia/Colombo",
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"Nepal Standard Time": "Asia/Katmandu",
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"Central Asia Standard Time": "Asia/Bishkek",
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"Bangladesh Standard Time": "Asia/Dhaka",
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"Omsk Standard Time": "Asia/Omsk",
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"Myanmar Standard Time": "Asia/Rangoon",
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"SE Asia Standard Time": "Asia/Bangkok",
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"Altai Standard Time": "Asia/Barnaul",
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"W. Mongolia Standard Time": "Asia/Hovd",
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"North Asia Standard Time": "Asia/Krasnoyarsk",
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"N. Central Asia Standard Time": "Asia/Novosibirsk",
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"Tomsk Standard Time": "Asia/Tomsk",
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"China Standard Time": "Asia/Shanghai",
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"North Asia East Standard Time": "Asia/Irkutsk",
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"Singapore Standard Time": "Asia/Singapore",
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"W. Australia Standard Time": "Australia/Perth",
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"Taipei Standard Time": "Asia/Taipei",
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"Ulaanbaatar Standard Time": "Asia/Ulaanbaatar",
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"Aus Central W. Standard Time": "Australia/Eucla",
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"Transbaikal Standard Time": "Asia/Chita",
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"Tokyo Standard Time": "Asia/Tokyo",
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"North Korea Standard Time": "Asia/Pyongyang",
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"Korea Standard Time": "Asia/Seoul",
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"Yakutsk Standard Time": "Asia/Yakutsk",
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"Cen. Australia Standard Time": "Australia/Adelaide",
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"AUS Central Standard Time": "Australia/Darwin",
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"E. Australia Standard Time": "Australia/Brisbane",
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"AUS Eastern Standard Time": "Australia/Sydney",
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"West Pacific Standard Time": "Pacific/Port_Moresby",
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"Tasmania Standard Time": "Australia/Hobart",
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"Vladivostok Standard Time": "Asia/Vladivostok",
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"Lord Howe Standard Time": "Australia/Lord_Howe",
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"Bougainville Standard Time": "Pacific/Bougainville",
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"Russia Time Zone 10": "Asia/Srednekolymsk",
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"Magadan Standard Time": "Asia/Magadan",
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"Norfolk Standard Time": "Pacific/Norfolk",
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"Sakhalin Standard Time": "Asia/Sakhalin",
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"Central Pacific Standard Time": "Pacific/Guadalcanal",
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"Russia Time Zone 11": "Asia/Kamchatka",
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"New Zealand Standard Time": "Pacific/Auckland",
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"UTC+12": "Etc/GMT-12",
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"Fiji Standard Time": "Pacific/Fiji",
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"Chatham Islands Standard Time": "Pacific/Chatham",
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"UTC+13": "Etc/GMT-13",
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"Tonga Standard Time": "Pacific/Tongatapu",
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"Samoa Standard Time": "Pacific/Apia",
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"Line Islands Standard Time": "Pacific/Kiritimati"
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}
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}

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