A lightweight javascript date library for parsing, validating, manipulating, and formatting dates.

# [Documentation](http://momentjs.com/docs/)

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](https://gist.github.com/timrwood/e72f2eef320ed9e37c51#backwards-incompatible-changes)

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](https://travis-ci.org/moment/moment.png?branch=develop)](https://travis-ci.org/moment/moment)

Master [![Build Status](https://travis-ci.org/moment/moment.png?branch=master)](https://travis-ci.org/moment/moment)

Changelog
=========

### 2.3.1

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

### 2.3.0 [See changelog](https://gist.github.com/ichernev/6864354)

Changed isValid, added strict parsing.
Week tokens parsing.

### 2.2.1

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

### 2.2.0 [See changelog](https://gist.github.com/ichernev/00f837a9baf46a3565e4)

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](https://gist.github.com/timrwood/b8c2d90d528eddb53ab5)

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](https://gist.github.com/timrwood/e72f2eef320ed9e37c51)

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](https://github.com/timrwood/moment/issues/456)

Bugfixes

### 1.7.1 [See discussion](https://github.com/timrwood/moment/issues/384)

Bugfixes

### 1.7.0 [See discussion](https://github.com/timrwood/moment/issues/288)

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

Added validation via `moment.fn.isValid()`.

Made formatting method 3x faster. http://jsperf.com/momentjs-cached-format-functions

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](https://github.com/timrwood/moment/pull/268)

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](https://github.com/timrwood/moment/issues/162) 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](https://github.com/timrwood/moment/pull/222).

### 1.5.0 [See milestone](https://github.com/timrwood/moment/issues?milestone=10&page=1&state=closed)

Added UTC mode.

Added automatic ISO8601 parsing.

Various bugfixes.

### 1.4.0 [See milestone](https://github.com/timrwood/moment/issues?milestone=8&state=closed)

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](https://github.com/timrwood/moment/issues?milestone=7&state=closed)

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 `moment.fn.day` as a setter.

Various bugfixes

### 1.2.0 [See milestone](https://github.com/timrwood/moment/issues?milestone=4&state=closed)

Added timezones to parser and formatter.

Added `moment.fn.isDST`.

Added `moment.fn.zone` to get the timezone offset in minutes.

### 1.1.2 [See milestone](https://github.com/timrwood/moment/issues?milestone=6&state=closed)

Various bugfixes

### 1.1.1 [See milestone](https://github.com/timrwood/moment/issues?milestone=5&state=closed)

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

### 1.1.0

Added `moment.fn.format` localized masks. 'L LL LLL LLLL' [issue 29](https://github.com/timrwood/moment/pull/29)

Fixed [issue 31](https://github.com/timrwood/moment/pull/31).

### 1.0.1

Added `moment.version` to get the current version.

Removed `window !== undefined` when checking if module exists to support browserify. [issue 25](https://github.com/timrwood/moment/pull/25)

### 1.0.0

Added convenience methods for getting and setting date parts.

Added better support for `moment.add()`.

Added better lang support in NodeJS.

Renamed library from underscore.date to Moment.js

### 0.6.1

Added Portuguese, Italian, and French language support

### 0.6.0

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.

### 0.5.2

Bugfix for [issue 8](https://github.com/timrwood/underscore.date/pull/8) and [issue 9](https://github.com/timrwood/underscore.date/pull/9).

### 0.5.1

Bugfix for [issue 5](https://github.com/timrwood/underscore.date/pull/5).

### 0.5.0

Dropped the redundant `_date.date()` in favor of `_date()`.
Removed `_date.now()`, 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.

### 0.4.1

Added date input formats for input strings.

### 0.4.0

Added underscore.date to npm. Removed dependencies on underscore.

### 0.3.2

Added `'z'` and `'zz'` to `_.date().format()`. Cleaned up some redundant code to trim off some bytes.

### 0.3.1

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

### 0.3.0

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

### 0.2.1

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`.

### 0.2.0

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

### 0.1.0

Initial release

License
=======

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