Moment.js is a lightweight javascript date library for parsing, manipulating, and formatting dates.
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A lightweight javascript date library for parsing, validating, manipulating, and formatting dates.


Upgrading to 2.0.0

There are a number of small backwards incompatible changes with version 2.0.0.

See them and their descriptions here

Changed language ordinal method to return the number + ordinal instead of just the ordinal.

Changed two digit year parsing cutoff to match strptime.

Removed moment#sod and moment#eod in favor of moment#startOf and moment#endOf.

Removed moment.humanizeDuration() in favor of moment.duration().humanize().

Removed the lang data objects from the top level namespace.

Duplicate Date passed to moment() instead of referencing it.

Travis Build Status

Develop Build Status

Master Build Status

For developers

You need node, use nvm or nenv to install it.

Then, in your shell

git clone
cd moment
npm install -g grunt-cli
npm install
git checkout develop  # all patches against develop branch, please!
grunt                 # this runs tests and jshint


2.7.0 See changelog

  • new languages

    • #1678 Bengali (bn)
    • #1628 Azerbaijani (az)
    • #1633 Arabic, Saudi Arabia (ar-sa)
    • #1648 Austrian German (de-at)
  • features

    • #1663 configurable relative time thresholds
    • #1554 support anchor time in moment.calendar
    • #1693 support moment.ISO_8601 as parsing format
    • #1637 add moment.min and moment.max and deprecate min/max instance methods
    • #1704 support string value in add/subtract
    • #1647 add spm support (package manager)
  • bugfixes

2.6.0 See changelog

  • languages

  • features

    • #1419, #1468, #1467, #1546 better handling of timezone-d moments around DST
    • #1462 add weeksInYear and isoWeeksInYear
    • #1475 support ordinal parsing
    • #1499 composer support
    • #1577, #1604 put Date parsing in moment.createFromInputFallback so it can be properly deprecated and controlled in the future
    • #1545 extract two-digit year parsing in moment.parseTwoDigitYear, so it can be overwritten
    • #1590 (see #1574) set AMD global before module definition to better support non AMD module dependencies used in AMD environment
    • #1589 remove global in Node.JS environment (was not working before, nobody complained, was scheduled for removal anyway)
    • #1586 support quarter setting and parsing
  • 18 bugs fixed


  • languages

  • bugfixes

    • #1429 fixes #1423 weird chrome-32 bug with js object creation
    • #1421 remove html entities from Welsh
    • #1418 fixes #1401 improved non-padded tokens in strict matching
    • #1417 fixes #1404 handle buggy moment object created by property cloning
    • #1398 fixes #1397 fix Arabic-like week number parsing
    • #1396 add leftZeroFill(4) to GGGG and gggg formats
    • #1373 use lowercase for months and days in Catalan
  • testing

    • #1374 run tests on multiple browser/os combos via SauceLabs and Travis

2.5.0 See changelog

  • New languages

  • Features

    • 1311 Add quarter getter and format token Q
    • 1303 strict parsing now respects number of digits per token (fix 1196)
    • 0d30bb7 add jspm support
    • 1347 improve zone parsing
    • 1362 support merideam parsing in Korean
  • 22 bugfixes


  • Deprecate globally exported moment, will be removed in next major
  • New languages
  • Bugfixes
    • properly handle Z at the end of iso RegExp #1187
    • chinese meridian time improvements #1076
    • fix language tests #1177
    • remove some failing tests (that should have never existed :)) #1185 #1183
    • handle russian noun cases in weird cases #1195


Removed a trailing comma [1169] and fixed a bug with months, weekdays getters #1171.

2.3.0 See changelog

Changed isValid, added strict parsing. Week tokens parsing.


Fixed bug in string prototype test. Updated authors and contributors.

2.2.0 See changelog

Added bower support.

Language files now use UMD.

Creating moment defaults to current date/month/year.

Added a bundle of moment and all language files.

2.1.0 See changelog

Added better week support.

Added ability to set offset with moment#zone.

Added ability to set month or weekday from a string.

Added moment#min and moment#max

2.0.0 See changelog

Added short form localized tokens.

Added ability to define language a string should be parsed in.

Added support for reversed add/subtract arguments.

Added support for endOf('week') and startOf('week').

Fixed the logic for moment#diff(Moment, 'months') and moment#diff(Moment, 'years')

moment#diff now floors instead of rounds.

Normalized moment#toString.

Added isSame, isAfter, and isBefore methods.

Added better week support.

Added moment#toJSON

Bugfix: Fixed parsing of first century dates

Bugfix: Parsing 10Sep2001 should work as expected

Bugfix: Fixed wierdness with moment.utc() parsing.

Changed language ordinal method to return the number + ordinal instead of just the ordinal.

Changed two digit year parsing cutoff to match strptime.

Removed moment#sod and moment#eod in favor of moment#startOf and moment#endOf.

Removed moment.humanizeDuration() in favor of moment.duration().humanize().

Removed the lang data objects from the top level namespace.

Duplicate Date passed to moment() instead of referencing it.

1.7.2 See discussion


1.7.1 See discussion


1.7.0 See discussion

Added moment.fn.endOf() and moment.fn.startOf().

Added validation via moment.fn.isValid().

Made formatting method 3x faster.

Add support for month/weekday callbacks in moment.fn.format()

Added instance specific languages.

Added two letter weekday abbreviations with the formatting token dd.

Various language updates.

Various bugfixes.

1.6.0 See discussion

Added Durations.

Revamped parser to support parsing non-separated strings (YYYYMMDD vs YYYY-MM-DD).

Added support for millisecond parsing and formatting tokens (S SS SSS)

Added a getter for moment.lang()

Various bugfixes.

There are a few things deprecated in the 1.6.0 release.

  1. The format tokens z and zz (timezone abbreviations like EST CST MST etc) will no longer be supported. Due to inconsistent browser support, we are unable to consistently produce this value. See this issue for more background.

  2. The method moment.fn.native is deprecated in favor of moment.fn.toDate. There continue to be issues with Google Closure Compiler throwing errors when using native, even in valid instances.

  3. The way to customize am/pm strings is being changed. This would only affect you if you created a custom language file. For more information, see this issue.

1.5.0 See milestone

Added UTC mode.

Added automatic ISO8601 parsing.

Various bugfixes.

1.4.0 See milestone

Added moment.fn.toDate as a replacement for moment.fn.native.

Added moment.fn.sod and moment.fn.eod to get the start and end of day.

Various bugfixes.

1.3.0 See milestone

Added support for parsing month names in the current language.

Added escape blocks for parsing tokens.

Added moment.fn.calendar to format strings like 'Today 2:30 PM', 'Tomorrow 1:25 AM', and 'Last Sunday 4:30 AM'.

Added as a setter.

Various bugfixes

1.2.0 See milestone

Added timezones to parser and formatter.

Added moment.fn.isDST.

Added to get the timezone offset in minutes.

1.1.2 See milestone

Various bugfixes

1.1.1 See milestone

Added time specific diffs (months, days, hours, etc)


Added moment.fn.format localized masks. 'L LL LLL LLLL' issue 29

Fixed issue 31.


Added moment.version to get the current version.

Removed window !== undefined when checking if module exists to support browserify. issue 25


Added convenience methods for getting and setting date parts.

Added better support for moment.add().

Added better lang support in NodeJS.

Renamed library from to Moment.js


Added Portuguese, Italian, and French language support


Added _date.lang() support. Added support for passing multiple formats to try to parse a date. _date("07-10-1986", ["MM-DD-YYYY", "YYYY-MM-DD"]); Made parse from string and single format 25% faster.


Bugfix for issue 8 and issue 9.


Bugfix for issue 5.


Dropped the redundant in favor of _date(). Removed, as it is a duplicate of _date() with no parameters. Removed _date.isLeapYear(yearNumber). Use _date([yearNumber]).isLeapYear() instead. Exposed customization options through the _date.relativeTime, _date.weekdays, _date.weekdaysShort, _date.months, _date.monthsShort, and _date.ordinal variables instead of the _date.customize() function.


Added date input formats for input strings.


Added to npm. Removed dependencies on underscore.


Added 'z' and 'zz' to Cleaned up some redundant code to trim off some bytes.


Cleaned up the namespace. Moved all date manipulation and display functions to the object.


Switched to the Underscore methodology of not mucking with the native objects' prototypes. Made chaining possible.


Changed date names to be a more pseudo standardized 'dddd, MMMM Do YYYY, h:mm:ss a'. Added Date.prototype functions add, subtract, isdst, and isleapyear.


Changed function names to be more concise. Changed date format from php date format to custom format.


Initial release


Moment.js is freely distributable under the terms of the MIT license.