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npm / dayjs

dayjs

What changed in dayjs 1, from its official release notes, upgrade guides and advisories. Sources checked 2026-10-18.

1 deprecations1 performance7 fixes and other

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dayjs 19 changes

Deprecations 1

Performance 1

  • Arabic locale functions no longer instantiate regexes, avoiding performance overhead.

    1.11.19release notes

Fixes and other changes 7

  • The timezone plugin no longer throws a RangeError for invalid Day.js values.

    1.11.23release notes

  • Fixes timezone offset computation for instance tz() without relying on host DST.

    1.11.22release notes

  • Unsupported year tokens are now preserved in format output.

    1.11.21release notes

  • The Khmer locale now supports meridiem.

    1.11.20release notes

  • The updateLocale plugin merges nested object properties instead of replacing them.

    1.11.20release notes

  • The Belarusian locale was updated with relative time.

    1.11.19release notes

  • The Italian locale phrase “un' ora fa” was replaced with “un'ora fa”.

    1.11.19release notes