# dayjs changelog > dayjs release notes. - Vendor: dayjs - Category: Frameworks & Libraries - Official site: https://day.js.org/ - Tracked by: What's New (https://whatsnew.fyi/product/dayjs) - Harvested from: GitHub (iamkun/dayjs) - Entries below: 10 (newest first) What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog. ## Releases ### v1.11.21 - Date: 2026-05-26 - Version: v1.11.21 - Original notes: https://github.com/iamkun/dayjs/releases/tag/v1.11.21 - Permalink: https://whatsnew.fyi/product/dayjs/releases/v1.11.21 - **fixed** — preserve unsupported year tokens in format ##### [1.11.21](https://github.com/iamkun/dayjs/compare/v1.11.20...v1.11.21) (2026-05-26) ###### Bug Fixes * preserve unsupported year tokens in format ([#3015](https://github.com/iamkun/dayjs/issues/3015)) ([#3016](https://github.com/iamkun/dayjs/issues/3016)) ([8fda602](https://github.com/iamkun/dayjs/commit/8fda602beac5abbc64230ddc49085aa532320f26)) ### v1.11.20 - Date: 2026-03-12 - Version: v1.11.20 - Original notes: https://github.com/iamkun/dayjs/releases/tag/v1.11.20 - Permalink: https://whatsnew.fyi/product/dayjs/releases/v1.11.20 - **fixed** — Update locale km.js to support meridiem - **fixed** — Update updateLocale plugin to merge nested object properties instead of replacing ##### [1.11.20](https://github.com/iamkun/dayjs/compare/v1.11.19...v1.11.20) (2026-03-12) ###### Bug Fixes * Update locale km.js to support meridiem ([#3017](https://github.com/iamkun/dayjs/issues/3017)) ([9d2b6a1](https://github.com/iamkun/dayjs/commit/9d2b6a1ec744ad5db13afd4d701f93349135dfec)) * update updateLocale plugin to merge nested object properties instead of replacing ([#3012](https://github.com/iamkun/dayjs/issues/3012)) ([99691c5](https://github.com/iamkun/dayjs/commit/99691c5f3bd1371d3b763d5f9dfaed9a1945a477)), closes [#1118](https://github.com/iamkun/dayjs/issues/1118) ### v1.11.19 - Date: 2025-10-31 - Version: v1.11.19 - Original notes: https://github.com/iamkun/dayjs/releases/tag/v1.11.19 - Permalink: https://whatsnew.fyi/product/dayjs/releases/v1.11.19 - **fixed** — Add usage warnings for diff and update unit tests - **fixed** — Avoid instantiating regexes within ar locale functions to improve performance - **fixed** — Replace italian locale "un' ora fa" with "un'ora fa" and add tests for it - **fixed** — Update Belarusian locale with relative time ##### [1.11.19](https://github.com/iamkun/dayjs/compare/v1.11.18...v1.11.19) (2025-10-31) ###### Bug Fixes * added usage warnings for diff + updated unit tests ([#2948](https://github.com/iamkun/dayjs/issues/2948)) ([269a7a9](https://github.com/iamkun/dayjs/commit/269a7a9cf3649b7a4b328e771173701764a8480d)) * dont instantiate regexes within ar locale functions to avoid performance overhead ([#2898](https://github.com/iamkun/dayjs/issues/2898)) ([af5e9f0](https://github.com/iamkun/dayjs/commit/af5e9f0e7649cbd1ecf707daab8303f2733f2563)) * replace italian locale "un' ora fa" with "un'ora fa", add tests for it ([#2930](https://github.com/iamkun/dayjs/issues/2930)) ([9e9f76c](https://github.com/iamkun/dayjs/commit/9e9f76cf117fa834260b30193434bc4481b4b6be)) * Updated Belarusian locale with relative time ([#2656](https://github.com/iamkun/dayjs/issues/2656)) ([1d8746c](https://github.com/iamkun/dayjs/commit/1d8746c23bd667bde80ee627a915301ebd69e1a2)) ### v1.11.18 - Date: 2025-08-30 - Version: v1.11.18 - Original notes: https://github.com/iamkun/dayjs/releases/tag/v1.11.18 - Permalink: https://whatsnew.fyi/product/dayjs/releases/v1.11.18 - **fixed** — error semantic-release dependency ##### [1.11.18](https://github.com/iamkun/dayjs/compare/v1.11.17...v1.11.18) (2025-08-30) ###### Bug Fixes * error semantic-release dependency ([8cfb313](https://github.com/iamkun/dayjs/commit/8cfb31386d840d31e9655870f4d8c01592eb753a)) ### v1.11.17 - Date: 2025-08-29 - Version: v1.11.17 - Original notes: https://github.com/iamkun/dayjs/releases/tag/v1.11.17 - Permalink: https://whatsnew.fyi/product/dayjs/releases/v1.11.17 - **fixed** — en-AU locale now uses the same ordinal as moment ##### [1.11.17](https://github.com/iamkun/dayjs/compare/v1.11.16...v1.11.17) (2025-08-29) ###### Bug Fixes * [en-AU] locale use the same ordinal as moment ([#2878](https://github.com/iamkun/dayjs/issues/2878)) ([1b95ecd](https://github.com/iamkun/dayjs/commit/1b95ecd21d4feafe7ab113a2d48d7d8d93bb95c9)) ### v1.11.16 - Date: 2025-08-29 - Version: v1.11.16 - Original notes: https://github.com/iamkun/dayjs/releases/tag/v1.11.16 - Permalink: https://whatsnew.fyi/product/dayjs/releases/v1.11.16 ##### [1.11.16](https://github.com/iamkun/dayjs/compare/v1.11.15...v1.11.16) (2025-08-29) ###### Bug Fixes * test release workflow (no code changes) ([c38c428](https://github.com/iamkun/dayjs/commit/c38c428a78c344699eff373adfc8c007bb3a514f)) ### v1.11.15 - Date: 2025-08-28 - Version: v1.11.15 - Original notes: https://github.com/iamkun/dayjs/releases/tag/v1.11.15 - Permalink: https://whatsnew.fyi/product/dayjs/releases/v1.11.15 - **fixed** — Fix misspellings in Irish or Irish Gaelic [ga] locale ##### [1.11.15](https://github.com/iamkun/dayjs/compare/v1.11.14...v1.11.15) (2025-08-28) ###### Bug Fixes * Fix misspellings in Irish or Irish Gaelic [ga] ([#2861](https://github.com/iamkun/dayjs/issues/2861)) ([9c14a42](https://github.com/iamkun/dayjs/commit/9c14a4245a8e764ee3260ff17a7ff48dfd09d279)) ### v1.11.14 - Date: 2025-08-27 - Version: v1.11.14 - Original notes: https://github.com/iamkun/dayjs/releases/tag/v1.11.14 - Permalink: https://whatsnew.fyi/product/dayjs/releases/v1.11.14 - **fixed** — Fix .utcOffset(0, true) result and its clone being different ##### [1.11.14](https://github.com/iamkun/dayjs/compare/v1.11.13...v1.11.14) (2025-08-27) ###### Bug Fixes * .utcOffset(0, true) result and its clone are different bug ([#2505](https://github.com/iamkun/dayjs/issues/2505)) ([fefdcd4](https://github.com/iamkun/dayjs/commit/fefdcd4b6b807786f65139b6dd801e0014d7dc6f)) ### v1.11.13 - Date: 2024-08-20 - Version: v1.11.13 - Original notes: https://github.com/iamkun/dayjs/releases/tag/v1.11.13 - Permalink: https://whatsnew.fyi/product/dayjs/releases/v1.11.13 - **fixed** — customParseFormat supports Q quarter / w ww weekOfYear ##### [1.11.13](https://github.com/iamkun/dayjs/compare/v1.11.12...v1.11.13) (2024-08-20) ###### Bug Fixes * customParseFormat supports Q quter / w ww weekOfYear ([#2705](https://github.com/iamkun/dayjs/issues/2705)) ([8ca74f1](https://github.com/iamkun/dayjs/commit/8ca74f178eff4bb4eb686676cf35fe7edb815536)) ### v1.11.12 - Date: 2024-07-18 - Version: v1.11.12 - Original notes: https://github.com/iamkun/dayjs/releases/tag/v1.11.12 - Permalink: https://whatsnew.fyi/product/dayjs/releases/v1.11.12 - **fixed** — Add NegativeYear Plugin support - **fixed** — Add UTC support to negativeYear plugin - **fixed** — Fix zero offset issue when use tz with locale - **fixed** — Improve typing for min/max plugin - **fixed** — Timezone plugin correct parse UTC tz ##### [1.11.12](https://github.com/iamkun/dayjs/compare/v1.11.11...v1.11.12) (2024-07-18) ###### Bug Fixes * Add NegativeYear Plugin support ([#2640](https://github.com/iamkun/dayjs/issues/2640)) ([6a42e0d](https://github.com/iamkun/dayjs/commit/6a42e0d7398639238f575d51287daaf4d495a2a3)) * add UTC support to negativeYear plugin ([#2692](https://github.com/iamkun/dayjs/issues/2692)) ([f3ef705](https://github.com/iamkun/dayjs/commit/f3ef705613af83333fe132b470896a65e12f31b0)) * Fix zero offset issue when use tz with locale ([#2532](https://github.com/iamkun/dayjs/issues/2532)) ([d0e6738](https://github.com/iamkun/dayjs/commit/d0e6738a66e1b65d3706aad2f9168ebb43d4f887)) * Improve typing for min/max plugin ([#2573](https://github.com/iamkun/dayjs/issues/2573)) ([4fbe94a](https://github.com/iamkun/dayjs/commit/4fbe94aaba8c815a42cf4d23dabac918ec50e68c)) * timezone plugin currect parse UTC tz ([#2693](https://github.com/iamkun/dayjs/issues/2693)) ([b575c81](https://github.com/iamkun/dayjs/commit/b575c81a8c9c85c7a0baf6f608a12f9d3ba95bd1))