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Plugin List

A plugin is an independent module that can be added to Day.js to extend functionality or add new features.

By default, Day.js comes with core code only and no installed plugin.

You can load multiple plugins based on your need.



  • Returns dayjs

Use a plugin.

import plugin
dayjs.extend(plugin, options) // with plugin options


  • Via NPM:
import dayjs from "dayjs";
import AdvancedFormat from "dayjs/plugin/advancedFormat"; // load on demand

dayjs.extend(AdvancedFormat); // use plugin
  • Via CDN:
<script src=""></script>
<!-- Load plugin as window.dayjs_plugin_NAME -->
<script src=""></script>

List of official plugins


  • AdvancedFormat extends dayjs().format API to supply more format options.
import advancedFormat from "dayjs/plugin/advancedFormat";


dayjs().format("Q Do k kk X x");

List of added formats:

Format Output Description
Q 1-4 Quarter
Do 1st 2nd ... 31st Day of Month with ordinal
k 1-23 The hour, beginning at 1
kk 01-23 The hour, 2-digits, beginning at 1
X 1360013296 Unix Timestamp in second
x 1360013296123 Unix Timestamp in millisecond


  • LocalizedFormat extends dayjs().format API to supply localized format options.
import LocalizedFormat from 'dayjs/plugin/localizedFormat'


dayjs().format('L LT')

List of added formats:

Format English Locale Sample Output
LT h:mm A 8:02 PM
LTS h:mm:ss A 8:02:18 PM
L MM/DD/YYYY 08/16/2018
LL MMMM D, YYYY August 16, 2018
LLL MMMM D, YYYY h:mm A August 16, 2018 8:02 PM
LLLL dddd, MMMM D, YYYY h:mm A Thursday, August 16, 2018 8:02 PM


  • RelativeTime adds .from .to .fromNow .toNow APIs to formats date to relative time strings (e.g. 3 hours ago).
import relativeTime from "dayjs/plugin/relativeTime";


dayjs().from(dayjs("1990")); // 2 years ago
dayjs().from(dayjs(), true); // 2 years




Time from now .fromNow(withoutSuffix?: boolean)

Returns the string of relative time from now.

Time from X .from(compared: Dayjs, withoutSuffix?: boolean)

Returns the string of relative time from X.

Time to now .toNow(withoutSuffix?: boolean)

Returns the string of relative time to now.

Time to X .to(compared: Dayjs, withoutSuffix?: boolean)

Returns the string of relative time to X.

Range Key Sample Output
0 to 44 seconds s a few seconds ago
45 to 89 seconds m a minute ago
90 seconds to 44 minutes mm 2 minutes ago ... 44 minutes ago
45 to 89 minutes h an hour ago
90 minutes to 21 hours hh 2 hours ago ... 21 hours ago
22 to 35 hours d a day ago
36 hours to 25 days dd 2 days ago ... 25 days ago
26 to 45 days M a month ago
46 days to 10 months MM 2 months ago ... 10 months ago
11 months to 17months y a year ago
18 months+ yy 2 years ago ... 20 years ago


  • IsLeapYear adds .isLeapYear API to returns a boolean indicating whether the Dayjs's year is a leap year or not.
import isLeapYear from "dayjs/plugin/isLeapYear";


dayjs("2000-01-01").isLeapYear(); // true


  • BuddhistEra extends dayjs().format API to supply Buddhist Era (B.E.) format options.
  • Buddhist Era is a year numbering system that primarily used in mainland Southeast Asian countries of Cambodia, Laos, Myanmar and Thailand as well as in Sri Lanka and Chinese populations of Malaysia and Singapore for religious or official occasions (Wikipedia)
  • To calculate BE year manually, just add 543 to year. For example 26 May 1977 AD/CE should display as 26 May 2520 BE (1977 + 543)
import buddhistEra from "dayjs/plugin/buddhistEra";


dayjs().format("BBBB BB");

List of added formats:

Format Output Description
BBBB 2561 Full BE Year (Year + 543)
BB 61 2-digit of BE Year


  • IsSameOrAfter adds .isSameOrAfter() API to returns a boolean indicating if a date is same of after another date.
import isSameOrAfter from "dayjs/plugin/isSameOrAfter";


dayjs("2010-10-20").isSameOrAfter("2010-10-19", "year");


  • IsSameOrBefore adds .isSameOrBefore() API to returns a boolean indicating if a date is same of before another date.
import isSameOrBefore from "dayjs/plugin/isSameOrBefore";


dayjs("2010-10-20").isSameOrBefore("2010-10-19", "year");


  • IsBetween adds .isBetween() API to returns a boolean indicating if a date is between two other dates.
import isBetween from "dayjs/plugin/isBetween";


dayjs("2010-10-20").isBetween("2010-10-19", dayjs("2010-10-25"), "year");
dayjs('2016-10-30').isBetween('2016-01-01', '2016-10-30', null, '[)'); 
// '[' indicates inclusion, '(' indicates exclusion


  • DayOfYear adds .dayOfYear() API to returns a number indicating the Dayjs's day of the year, or to set the day of the year.
import dayOfYear from "dayjs/plugin/dayOfYear";


dayjs("2010-01-01").dayOfYear(); // 1
dayjs("2010-01-01").dayOfYear(365); // 2010-12-31


  • WeekOfYear adds .week() API to returns a number indicating the Dayjs's week of the year.
import weekOfYear from "dayjs/plugin/weekOfYear";


dayjs("2018-06-27").week(); // 26


  • QuarterOfYear add .quarter() API to return to which quarter of the year belongs a date
import quarterOfYear from "dayjs/plugin/quarterOfYear";


dayjs("2010-04-01").quarter(); // 2


  • CustomParseFormat extends dayjs() constructor to support custom formats of input strings.

To escape characters, wrap them in square brackets (e.g. [G]). Punctuation symbols (-:/.()) do not need to be wrapped.

import customParseFormat from "dayjs/plugin/customParseFormat";


dayjs("05/02/69 1:02:03 PM -05:00", "MM/DD/YY H:mm:ss A Z");
// Returns an instance containing '1969-05-02T18:02:03.000Z'

List of all available format tokens

Format Output Description
YY 18 Two-digit year
YYYY 2018 Four-digit year
M 1-12 Month, beginning at 1
MM 01-12 Month, 2-digits
D 1-31 Day of month
DD 01-31 Day of month, 2-digits
H 0-23 Hours
HH 00-23 Hours, 2-digits
h 1-12 Hours, 12-hour clock
hh 01-12 Hours, 12-hour clock, 2-digits
m 0-59 Minutes
mm 00-59 Minutes, 2-digits
s 0-59 Seconds
ss 00-59 Seconds, 2-digits
S 0-9 Hundreds of milliseconds, 1-digit
SS 00-99 Tens of milliseconds, 2-digits
SSS 000-999 Milliseconds, 3-digits
Z -5:00 Offset from UTC
ZZ -0500 Compact offset from UTC, 2-digits
A AM PM Post or ante meridiem, upper-case
a am pm Post or ante meridiem, lower-case


You could build your own Day.js plugin to meet different needs.

Feel free to open a pull request to share your plugin.

Template of a Day.js plugin.

export default (option, dayjsClass, dayjsFactory) => {
  // extend dayjs()
  // e.g. add dayjs().isSameOrBefore()
  dayjsClass.prototype.isSameOrBefore = function(arguments) {};

  // extend dayjs
  // e.g. add dayjs.utc()
  dayjsFactory.utc = arguments => {};

  // overriding existing API
  // e.g. extend dayjs().format()
  const oldFormat = dayjsClass.prototype.format;
  dayjsClass.prototype.format = function(arguments) {
    // original format result
    const result = oldFormat(arguments);
    // return modified result