iamkun/dayjs

View on GitHub

⏰ Day.js 2kB immutable date-time library alternative to Moment.js with the same modern API

Stars: 48.7k
Forks: 2.5k
Open beginner issues: 2
Indexed issues: 970

Dominant language: JavaScript
License: MIT
Last GitHub push: Sep 15, 2026
Latest indexed: Sep 17, 2026
Contributing guide: Contributing guide
Code of conduct: No code of conduct
Beginner labels: help wanted
PR merge metrics: No merged PRs in 30d

Open All

970 open issues indexed

Locale Contributions Wanted 🙋🙏 Open

🚨 High Priority help wanted

iamkun/dayjs#171 · 22 comments · 21 reactions · 0 assignees · Indexed Sep 17, 2026
Benchmarks anywhere? Open

discussion

iamkun/dayjs#197 · 7 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Extend property based tests to check if dayjs behaves similar to moment. Open

iamkun/dayjs#271 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
dayjs().isValid() how to use Open

iamkun/dayjs#306 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
dayjs set month error Open

discussion

iamkun/dayjs#399 · 11 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Plugins dependency Open

iamkun/dayjs#456 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Refactor (and redesign?) parseDate() Open

iamkun/dayjs#486 · 9 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Consider using Intl api Open

iamkun/dayjs#498 · 24 comments · 36 reactions · 0 assignees · Indexed Sep 17, 2026
CustomParseFormat escape unknown lenght string Open

iamkun/dayjs#571 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Incorrect parsing of year string with leading zeros Open

iamkun/dayjs#596 · 2 comments · 8 reactions · 0 assignees · Indexed Sep 17, 2026
customParseFormat doesn't work when format doesn't fit the Date Open

iamkun/dayjs#605 · 12 comments · 3 reactions · 0 assignees · Indexed Sep 17, 2026
Warn the user of missing customParseFormat import Open

iamkun/dayjs#609 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Please fix declension in relative time Open

iamkun/dayjs#610 · 2 comments · 2 reactions · 0 assignees · Indexed Sep 17, 2026
According to ISO 8601, the month starts with 1 through 12 Open

iamkun/dayjs#614 · 13 comments · 5 reactions · 0 assignees · Indexed Sep 17, 2026
An idea, create an organization to cover more languages? Open

iamkun/dayjs#627 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Inconsistent type error in `set()` from definition Open

iamkun/dayjs#639 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 17, 2026
CustomParseFormat produces incorrect date Open

iamkun/dayjs#648 · 3 comments · 4 reactions · 0 assignees · Indexed Sep 17, 2026
Is there an equivalent for moment.parseZone() in DayJS? Open

iamkun/dayjs#651 · 23 comments · 28 reactions · 0 assignees · Indexed Sep 17, 2026
invalid date +0000 iso Open

iamkun/dayjs#657 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Localization in combination with MuiPickersUtilsProvider seems to be broken Open

iamkun/dayjs#670 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
dayjs().toDate() get different value in browser and node Open

iamkun/dayjs#673 · 2 comments · 1 reaction · 0 assignees · Indexed Sep 17, 2026
add or subtract by 'date' is not working Open

iamkun/dayjs#681 · 9 comments · 2 reactions · 0 assignees · Indexed Sep 17, 2026
date1.diff(date2, 'day') does not produce expected result Open

iamkun/dayjs#684 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Autoload locale from browser language Open

iamkun/dayjs#732 · 3 comments · 6 reactions · 0 assignees · Indexed Sep 17, 2026
customParseFormat plugin set random values when parsing invalid date Open

iamkun/dayjs#737 · 4 comments · 1 reaction · 0 assignees · Indexed Sep 17, 2026
Inconsistent behavior of .diff() with "month" unit Open

iamkun/dayjs#755 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Bug diff() method Open

iamkun/dayjs#757 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
In IE, milliseconds format may be not correct. Open

iamkun/dayjs#759 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Feature Request - dayjs.safeParse() for safe parsing, especially for strings Open

iamkun/dayjs#773 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
String "cat-1" is a valid date Open

iamkun/dayjs#774 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Dayjs cannot parse from gggg Open

enhancement

iamkun/dayjs#784 · 2 comments · 5 reactions · 0 assignees · Indexed Sep 17, 2026
Errors when updating. Webpack related Open

iamkun/dayjs#792 · 12 comments · 13 reactions · 0 assignees · Indexed Sep 17, 2026
String + Format support Array Open

iamkun/dayjs#817 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
【bug】customParseFormat Quarter Error Open

iamkun/dayjs#845 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Found 6 locales that throw when doing relative date Open

iamkun/dayjs#854 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 17, 2026
WorkingDays plugin Open

iamkun/dayjs#868 · 12 comments · 3 reactions · 0 assignees · Indexed Sep 17, 2026
UTC compare returns wrong result Open

iamkun/dayjs#878 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
v1.8.26 breaks in constructing Dayjs instance with the second parameter Open

iamkun/dayjs#892 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Feature: add locale format string to localeData or somewhere else Open

enhancement

iamkun/dayjs#894 · 15 comments · 1 reaction · 0 assignees · Indexed Sep 17, 2026
Feature request: Formatting duration in multiple time units Open

enhancement

iamkun/dayjs#897 · 10 comments · 31 reactions · 0 assignees · Indexed Sep 17, 2026
locale is not a consistent Open

iamkun/dayjs#900 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
componentWillMount deprecated warnings on React Open

iamkun/dayjs#901 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
CustomParseFormat doesn't parse double digit days and months properly in strict mode Open

iamkun/dayjs#902 · 11 comments · 1 reaction · 0 assignees · Indexed Sep 17, 2026
ISO8601 dates with timezones not parsed properly in Safari Open

iamkun/dayjs#917 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Feature Request: Week of the month .format('wm') Open

iamkun/dayjs#927 · 1 comment · 1 reaction · 0 assignees · Indexed Sep 17, 2026
customParseFormat strict mode bug Open

☢️Bug

iamkun/dayjs#929 · 18 comments · 14 reactions · 0 assignees · Indexed Sep 17, 2026
Error parsing string Open

iamkun/dayjs#933 · 1 comment · 1 reaction · 0 assignees · Indexed Sep 17, 2026
Dayjs does not preserve timezone information when serializing to JSON string Open

iamkun/dayjs#934 · 8 comments · 8 reactions · 0 assignees · Indexed Sep 17, 2026
Add Latin locale Open

iamkun/dayjs#961 · 49 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Calculation of diff in years is wrong for leap-years (since v1.8.32) Open

☢️Bug

iamkun/dayjs#1000 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026

iamkun/dayjs

Get new issues in your inbox