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npm / date-fns

date-fns

What changed in date-fns 4, from its official release notes, upgrade guides and advisories. Sources checked 2026-10-17.

1 breaking1 deprecations1 new APIs and options5 fixes and other

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npx @unstale/cli init

@unstale/cli 0.1.0 on npm

date-fns 48 changes

Breaking changes 1

  • CDN source maps were removed from date-fns; users relying on them should switch to @date-fns/cdn.

    4.4.0release notes

Deprecations 1

  • CDN scripts are deprecated and will be removed in the next major release; use @date-fns/cdn instead.

    4.4.0release notes

New APIs and options 1

  • Introduces a package for CDN usage that includes CDN source maps.

    4.4.0release notes

Fixes and other changes 5

  • Corrects the pt locale so its first day of the week is Sunday.

    4.3.0release notes

  • Fixes month parsing for October, November, and December in the zh-CN locale.

    4.3.0release notes

  • Fixes month parsing for October, November, and December in the zh-HK locale.

    4.3.0release notes

  • Fixes month parsing for October, November, and December in the zh-TW locale.

    4.3.0release notes

  • Restores type definitions that were missing in v4.2.0 due to a TypeScript misconfiguration.

    4.2.1release notes