Moment.js is a fantastic time & date library with lots of great features and utilities. However, if you are working on a performance sensitive web application, it might cause a huge performance overhead because of its complex APIs and large bundle size.
Problems with Moment.js:
- Highly based on OOP APIs, which makes it fail to work with tree-shaking, thus leading to a huge bundle size and performance issues.
- Moment.js is mutable due to OOP APIs and non-pure functions, which causes bugs: https://github.com/moment/moment/blob/develop/src/test/moment/add_subtract.js#L244-L286
Only using some simple functions from moment.js might be considered overkill. dayjs has a smaller core and has very similar APIs so it makes it very easy to migrate. date-fns enables tree-shaking and other benefits so that it works great with React, Sinon.js, and webpack, etc. See moment/moment#2373 for more ideas on why and how people switch from moment.js to other solutions.
Name | Size(gzip) | Tree-shaking | Popularity | Methods richness | Pattern | Timezone Support | Locale |
---|---|---|---|---|---|---|---|
Moment.js | 329K(69.6K) | No | 38k | High | OO | Good(moment-timezone) | 123 |
date-fns | 78.4k(13.4k) without tree-shaking | Yes | 13k | High | Functional | Not yet | 32 |
dayjs | 6.5k(2.6k) without plugins | No | 14k | Medium | OO | Not yet | 23 |
Removed moment.js to replace with date-fns - build output reduced by 40%
—Jared Farago from webnode project.
—Dan Abramov, Author of Co-author of Redux and Create React App. Building tools for humans.
—Matija Marohnić, a design-savvy frontend developer from Croatia.
—Sergey Petushkov, a javaScript developer from Moscow, Russia • Currently in Berlin, Germany.
If you're using ESLint, you can install a plugin that will help you identify places in your codebase where you don't (may not) need Moment.js.
Install the plugin...
npm install --save-dev eslint-plugin-you-dont-need-momentjs
...then update your config
"extends" : ["plugin:you-dont-need-momentjs/recommended"],
- Millisecond/Second/Minute/Hour
- Date of Month
- Day of Week
- Day of Year
- Week of Year
- Days in Month
- Weeks in Year
- Maximum of the given dates
- Minimum of the given dates
Return the date parsed from date string using the given format string.
// Moment.js
moment('12-25-1995', 'MM-DD-YYYY');
// => "1995-12-24T13:00:00.000Z"
// date-fns
import parse from 'date-fns/parse';
parse('12-25-1995', 'MM-dd-yyyy', new Date());
// => "1995-12-24T13:00:00.000Z"
// dayjs
dayjs('12-25-1995');
// => "1995-12-24T13:00:00.000Z"
Return the date parsed from time string using the given format string.
// Moment.js
moment('2010-10-20 4:30', 'YYYY-MM-DD HH:mm');
// => "2010-10-19T17:30:00.000Z"
// date-fns
import parse from 'date-fns/parse';
parse('2010-10-20 4:30', 'yyyy-MM-dd H:mm', new Date());
// => "2010-10-19T17:30:00.000Z"
// dayjs ❌ does not support custom format parse
Return the date parsed from string using the given format string and locale.
// Moment.js
moment('2012 mars', 'YYYY MMM', 'fr');
// => "2012-02-29T13:00:00.000Z"
// date-fns
import parse from 'date-fns/parse';
import fr from 'date-fns/locale/fr';
parse('2012 mars', 'yyyy MMMM', new Date(), { locale: fr });
// => "2012-02-29T13:00:00.000Z"
// dayjs ❌ does not support custom format parse
Get the Millisecond/Second/Minute/Hour
of the given date.
// Moment.js
moment().seconds();
// => 49
moment().hours();
// => 19
// Native
new Date().getSeconds();
// => 49
new Date().getHours();
// => 19
// date-fns
import getSeconds from 'date-fns/getSeconds';
import getHours from 'date-fns/getHours';
getSeconds(new Date());
// => 49
getHours(new Date());
// => 19
// dayjs
dayjs().second();
// => 49
dayjs().hour();
// => 19
Set the Millisecond/Second/Minute/Hour
of the given date.
// Moment.js
moment().seconds(30);
// => "2018-09-09T09:12:30.695Z"
moment().hours(13);
// => "2018-09-09T03:12:49.695Z"
// Native
new Date(new Date().setSeconds(30));
// => "2018-09-09T09:12:30.695Z"
new Date(new Date().setHours(13));
// => "2018-09-09T03:12:49.695Z"
// date-fns
import setSeconds from 'date-fns/setSeconds';
import setHours from 'date-fns/setHours';
setSeconds(new Date(), 30);
// => "2018-09-09T09:12:30.695Z"
setHours(new Date(), 13);
// => "2018-09-09T03:12:49.695Z"
// dayjs
dayjs().set('second', 30);
// => "2018-09-09T09:12:30.695Z"
dayjs().set('hour', 13);
// => "2018-09-09T03:12:49.695Z"
Gets or sets the day of the month.
// Moment.js
moment().date();
// => 9
moment().date(4);
// => "2018-09-04T09:12:49.695Z"
// Native
new Date().getDate();
// => 9
new Date().setDate(4);
// => "2018-09-04T09:12:49.695Z"
// date-fns
import getDate from 'date-fns/getDate';
import setDate from 'date-fns/setDate';
getDate(new Date());
// => 9
setDate(new Date(), 4);
// => "2018-09-04T09:12:49.695Z"
// dayjs
dayjs().date();
// => 9
dayjs().set('date', 4);
// => "2018-09-04T09:12:49.695Z"
Gets or sets the day of the week.
// Moment.js
moment().day();
// => 0 (Sunday)
moment().day(-14);
// => "2018-08-26T09:12:49.695Z"
// Native
new Date().getDay();
// => 0 (Sunday)
new Date().setDate(new Date().getDate() - 14);
// => "2018-08-26T09:12:49.695Z"
// date-fns
import getDay from 'date-fns/getDay';
import setDay from 'date-fns/setDay';
getDay(new Date());
// => 0 (Sunday)
setDay(new Date(), -14);
// => "2018-08-26T09:12:49.695Z"
// dayjs
dayjs().day();
// => 0 (Sunday)
dayjs().set('day', -14);
// => "2018-08-26T09:12:49.695Z"
Gets or sets the day of the year.
// Moment.js
moment().dayOfYear();
// => 252
moment().dayOfYear(256);
// => "2018-09-13T09:12:49.695Z"
// date-fns
import getDayOfYear from 'date-fns/getDayOfYear';
import setDayOfYear from 'date-fns/setDayOfYear';
getDayOfYear(new Date());
// => 252
setDayOfYear(new Date(), 256);
// => "2018-09-13T09:12:49.695Z"
// dayjs ❌ does not support day of year
Gets or sets the week of the year.
// Moment.js
moment().week();
// => 37
moment().week(24);
// => "2018-06-10T09:12:49.695Z"
// date-fns
import getWeek from 'date-fns/getWeek';
import setWeek from 'date-fns/setWeek';
getWeek(new Date());
// => 37
setWeek(new Date(), 24);
// => "2018-06-10T09:12:49.695Z"
// dayjs ⚠️ requires weekOfYear plugin
import weekOfYear from 'dayjs/plugin/weekOfYear';
dayjs.extend(weekOfYear);
dayjs().week();
// => 37
// dayjs ❌ does not support set week of year
Get the number of days in the current month.
// Moment.js
moment('2012-02', 'YYYY-MM').daysInMonth();
// => 29
// date-fns
import getDaysInMonth from 'date-fns/getDaysInMonth';
getDaysInMonth(new Date(2012, 1));
// => 29
// dayjs
dayjs('2012-02').daysInMonth();
// => 29
Gets the number of weeks in the current year, according to ISO weeks.
// Moment.js
moment().isoWeeksInYear();
// => 52
// date-fns
import getISOWeeksInYear from 'date-fns/getISOWeeksInYear';
getISOWeeksInYear(new Date());
// => 52
// dayjs ❌ does not support weeks in the year
Returns the maximum (most distant future) of the given date.
const array = [
new Date(2017, 4, 13),
new Date(2018, 2, 12),
new Date(2016, 0, 10),
new Date(2016, 0, 9),
];
// Moment.js
moment.max(array.map(a => moment(a)));
// => "2018-03-11T13:00:00.000Z"
// Native
new Date(Math.max.apply(null, array)).toISOString();
// => "2018-03-11T13:00:00.000Z"
// date-fns
import max from 'date-fns/max';
max(array);
// => "2018-03-11T13:00:00.000Z"
// dayjs ❌ does not support the maximum of the given dates
Returns the minimum (most distant future) of the given date.
const array = [
new Date(2017, 4, 13),
new Date(2018, 2, 12),
new Date(2016, 0, 10),
new Date(2016, 0, 9),
];
// Moment.js
moment.min(array.map(a => moment(a)));
// => "2016-01-08T13:00:00.000Z"
// Native
new Date(Math.min.apply(null, array)).toISOString();
// => "2016-01-08T13:00:00.000Z"
// date-fns
import min from 'date-fns/min';
min(array);
// => "2016-01-08T13:00:00.000Z"
// dayjs ❌ does not support the minimum of the given dates
Add the specified number of days to the given date.
// Moment.js
moment().add(7, 'days');
// => "2018-09-16T09:12:49.695Z"
// date-fns
import addDays from 'date-fns/addDays';
addDays(new Date(), 7);
// => "2018-09-16T09:12:49.695Z"
// dayjs
dayjs().add(7, 'day');
// => "2018-09-16T09:12:49.695Z"
Subtract the specified number of days from the given date.
// Moment.js
moment().subtract(7, 'days');
// => "2018-09-02T09:12:49.695Z"
// date-fns
import subDays from 'date-fns/subDays';
subDays(new Date(), 7);
// => "2018-09-02T09:12:49.695Z"
// dayjs
dayjs().subtract(7, 'day');
// => "2018-09-02T09:12:49.695Z"
Return the start of a unit of time for the given date.
// Moment.js
moment().startOf('month');
// => "2018-08-31T14:00:00.000Z"
// date-fns
import startOfMonth from 'date-fns/startOfMonth';
startOfMonth(new Date());
// => "2018-08-31T14:00:00.000Z"
// dayjs
dayjs().startOf('month');
// => "2018-08-31T14:00:00.000Z"
Return the end of a unit of time for the given date.
// Moment.js
moment().endOf('day');
// => "2018-09-09T13:59:59.999Z"
// date-fns
import endOfDay from 'date-fns/endOfDay';
endOfDay(new Date());
// => "2018-09-09T13:59:59.999Z"
// dayjs
dayjs().endOf('day');
// => "2018-09-09T13:59:59.999Z"
Return the formatted date string in the given format.
// Moment.js
moment().format('dddd, MMMM Do YYYY, h:mm:ss A');
// => "Sunday, September 9th 2018, 7:12:49 PM"
moment().format('ddd, hA');
// => "Sun, 7PM"
// date-fns
import format from 'date-fns/format';
format(new Date(), 'eeee, MMMM do YYYY, h:mm:ss aa');
// => "Sunday, September 9th 2018, 7:12:49 PM"
format(new Date(), 'eee, ha');
// => "Sun, 7PM"
// dayjs
dayjs().format('dddd, MMMM D YYYY, h:mm:ss A');
// => "Sunday, September 9 2018, 7:12:49 PM" ⚠️ not support 9th
dayjs().format('ddd, hA');
// => "Sun, 7PM"
Return time from now.
// Moment.js
moment(1536484369695).fromNow();
// => "4 days ago"
// date-fns
import formatDistance from 'date-fns/formatDistance';
formatDistance(new Date(1536484369695), new Date(), { addSuffix: true });
// => "4 days ago"
// dayjs ⚠️ requires relativeTime plugin
import relativeTime from 'dayjs/plugin/relativeTime';
dayjs.extend(relativeTime);
dayjs(1536484369695).fromNow();
// => "5 days ago" ⚠️ the rounding method of this plugin is different from moment.js and date-fns, use with care.
Return time from x.
// Moment.js
moment([2007, 0, 27]).to(moment([2007, 0, 29]));
// => "in 2 days"
// date-fns
import formatDistance from 'date-fns/formatDistance';
formatDistance(new Date(2007, 0, 27), new Date(2007, 0, 29));
// => "2 days"
// dayjs ⚠️ requires relativeTime plugin
import relativeTime from 'dayjs/plugin/relativeTime';
dayjs.extend(relativeTime);
dayjs('2007-01-27').to(dayjs('2007-01-29'));
// => "in 2 days"
Get the unit of time between the given dates.
// Moment.js
moment([2007, 0, 27]).diff(moment([2007, 0, 29]));
// => -172800000
moment([2007, 0, 27]).diff(moment([2007, 0, 29]), 'days');
// => -2
// date-fns
import differenceInMilliseconds from 'date-fns/differenceInMilliseconds';
differenceInMilliseconds(new Date(2007, 0, 27), new Date(2007, 0, 29));
// => -172800000
import differenceInDays from 'date-fns/differenceInDays';
differenceInDays(new Date(2007, 0, 27), new Date(2007, 0, 29));
// => -2
// dayjs
dayjs('2007-01-27').diff(dayjs('2007-01-29'), 'milliseconds');
// => -172800000
dayjs('2007-01-27').diff(dayjs('2007-01-29'), 'days');
// => -2
Check if a date is before another date.
// Moment.js
moment('2010-10-20').isBefore('2010-10-21');
// => true
// date-fns
import isBefore from 'date-fns/isBefore';
isBefore(new Date(2010, 9, 20), new Date(2010, 9, 21));
// => true
// dayjs
dayjs('2010-10-20').isBefore('2010-10-21');
// => true
Check if a date is same another date.
// Moment.js
moment('2010-10-20').isSame('2010-10-21');
// => false
moment('2010-10-20').isSame('2010-10-20');
// => true
moment('2010-10-20').isSame('2010-10-21', 'month');
// => true
// date-fns
import isSameDay from 'date-fns/isSameDay';
import isSameMonth from 'date-fns/isSameMonth';
isSameDay(new Date(2010, 9, 20), new Date(2010, 9, 21));
// => false
isSameDay(new Date(2010, 9, 20), new Date(2010, 9, 20));
// => true
isSameMonth(new Date(2010, 9, 20), new Date(2010, 9, 21));
// => true
// dayjs
dayjs('2010-10-20').isSame('2010-10-21');
// => false
dayjs('2010-10-20').isSame('2010-10-20');
// => true
// dayjs ❌ does not support is same month
Check if a date is after another date.
// Moment.js
moment('2010-10-20').isAfter('2010-10-19');
// => true
// date-fns
import isAfter from 'date-fns/isAfter';
isAfter(new Date(2010, 9, 20), new Date(2010, 9, 19));
// => true
// dayjs
dayjs('2010-10-20').isAfter('2010-10-19');
// => true
Check if a date is between two other dates.
// Moment.js
moment('2010-10-20').isBetween('2010-10-19', '2010-10-25');
// => true
// date-fns
import isWithinInterval from 'date-fns/isWithinInterval';
isWithinInterval(new Date(2010, 9, 20), {
start: new Date(2010, 9, 19),
end: new Date(2010, 9, 25),
});
// => true
// dayjs ⚠️ requires isBetween plugin
import isBetween from 'dayjs/plugin/isBetween';
dayjs.extend(isBetween);
dayjs('2010-10-20').isBetween('2010-10-19', '2010-10-25');
// => true
Check if a year is a leap year.
// Moment.js
moment([2000]).isLeapYear();
// => true
// date-fns
import isLeapYear from 'date-fns/isLeapYear';
isLeapYear(new Date(2000, 0, 1));
// => true
// dayjs ⚠️ requires isLeapYear plugin
import isLeapYear from 'dayjs/plugin/isLeapYear';
dayjs.extend(isLeapYear);
dayjs('2000').isLeapYear();
// => true
Check if a variable is a native js Date object.
// Moment.js
moment.isDate(new Date());
// => true
// date-fns
import isDate from 'date-fns/isDate';
isDate(new Date());
// => true
// dayjs ❌ does not support is date
MIT