Release v4.3.0: Add IANA timezone string support#117
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knowledgecode merged 4 commits intomasterfrom Feb 23, 2026
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- Remove local timezone dependency in getLastDayOfMonth by using Date.UTC - Expand timezone offset (Z token) valid range from -840~720 to -913~956 to support historical timezone offsets (e.g., Metlakatla, Manila) - Add test cases for min (America/Metlakatla) and max (Asia/Manila) offsets
- Move isUTC helper from zone.ts to datetime.ts and add dtfToParts helper - Refactor getTimezoneOffset and createTimezoneDate in zone.ts to accept IANA timezone name strings (e.g., 'America/Los_Angeles') in addition to TimeZone objects - Update ParserPluginOptions.timeZone type to TimeZone | string in parser.ts; integrate ignoreCase logic into find function and add validateToken - Update day-of-week plugin to use new find signature with options parameter - Change timeZone argument type to TimeZone | string in addDays, addMonths, addYears, parse, and preparse - Add test cases for IANA string timezones and historical timezone changes (Metlakatla, Manila); expand boundary values to -1601/+1601
- Update type signatures from TimeZone | 'UTC' to TimeZone | string across all API docs (addDays, addMonths, addYears, format, parse, subtract, etc.) - Document IANA timezone string usage for all date manipulation functions - Add v4.3.0 new features section to migration.md - Promote Method 3 (IANA string) as the recommended approach in timezones.md - Fix minor grammar and punctuation issues
- Bump version from 4.2.0 to 4.3.0 - Upgrade ESLint 9 to 10 and add @eslint/js - Update @stylistic/eslint-plugin, @types/node, vitest, rollup, and typescript-eslint to latest versions - Add minimatch: ^10.2.2 to overrides - Add SwitchCase: 0 to @stylistic/indent rule in eslint.config.js
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Summary
addDays,addMonths,addYears,parse,format, etc.)isValidTest Plan
tests/parse.spec.tsisValidedge case tests pass intests/isValid.spec.ts