The moment npm package is a JavaScript library for parsing, validating, manipulating, and formatting dates. It is widely used for handling dates and times in Node.js and browser applications.
Parsing
Parse a date string into a moment object.
moment('2023-04-05')Validation
Check if a date is valid.
moment('2023-04-05').isValid()Manipulation
Manipulate dates by adding time to the current date.
moment().add(7, 'days')Formatting
Format a moment date object into a string in a specified format.
moment().format('YYYY-MM-DD')Query
Query dates to compare them.
moment().isBefore('2023-12-25')Provides a collection of simple, pure functions for manipulating JavaScript dates. It is modular, allowing you to pick and choose which functions you need, and is generally considered to be a lighter-weight alternative to moment.
Created by one of the original Moment.js team members, Luxon is a modern library for working with dates and times. It offers a fluent API and aims to have a smaller footprint than moment.
Day.js is a minimalist JavaScript library that parses, validates, manipulates, and displays dates and times for modern browsers with a largely Moment.js-compatible API. It is lightweight and its API is designed to be familiar to Moment.js users.
A lightweight javascript date library for parsing, validating, manipulating, and formatting dates.
There are a few things being deprecated in the 1.6.0 release.
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.
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.
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.
To contribute, fork the library and install these npm packages.
npm install jshint uglify-js nodeunit
You can add tests to the files in /test/moment or add a new test file if you are adding a new feature.
To run the tests, do make test to run all tests, make test-moment to test the core library, and make test-lang to test all the languages.
To check the filesize, you can use make size.
To minify all the files, use make moment to minify moment, make langs to minify all the lang files, or just make to minfy everything.
If your code passes the unit tests (including the ones you wrote), submit a pull request.
Moment.js now uses git-flow. If you're not familiar with git-flow, please read up on it, you'll be glad you did.
When submitting new features, please create a new feature branch using git flow feature start <name> and submit the pull request to the develop branch.
Pull requests for enhancements for features should be submitted to the develop branch as well.
When submitting a bugfix, please check if there is an existing bugfix branch. If the latest stable version is 1.5.0, the bugfix branch would be hotfix/1.5.1. All pull requests for bug fixes should be on a hotfix branch, unless the bug fix depends on a new feature.
The master branch should always have the latest stable version. When bugfix or minor releases are needed, the develop/hotfix branch will be merged into master and released.
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.
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.
Added UTC mode.
Added automatic ISO8601 parsing.
Various bugfixes.
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.
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
Added timezones to parser and formatter.
Added moment.fn.isDST.
Added moment.fn.zone to get the timezone offset in minutes.
Various bugfixes
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 underscore.date 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.
Buxfix for issue 8 and issue 9.
Buxfix for issue 5.
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(yearNuumber). 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 underscore.date to npm. Removed dependancies on underscore.
Added 'z' and 'zz' to _.date().format(). Cleaned up some redundant code to trim off some bytes.
Cleaned up the namespace. Moved all date manipulation and display functions to the _.date() 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.
Copyright (c) 2011-2012 Tim Wood
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
1.7.0 See discussion
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.
FAQs
Parse, validate, manipulate, and display dates
The npm package moment receives a total of 7,737,533 weekly downloads. As such, moment popularity was classified as popular.
We found that moment demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 5 open source maintainers collaborating on the project.
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