Plugins

date-and-time adopts a plugin system. Special tokens that are considered to be used relatively infrequently are provided as plugins outside the main library. By adding plugins as needed, you can use those tokens in Formatter and Parser. Here, Formatter refers to the output engine used by the format function, and Parser refers to the parsing engine used by the parse, preparse, and isValid functions. These engines are extended by adding plugins as arguments to these functions.

Install

• ESModules:

import { format } from 'date-and-time';
import foobar from 'date-and-time/plugins/foobar';

format(new Date(), 'ddd, MMM DD YYYY', { plugins: [foobar] });

• CommonJS:

const { format } = require('date-and-time');
const foobar = require('date-and-time/plugins/foobar');

format(new Date(), 'ddd, MMM DD YYYY', { plugins: [foobar] });

Plugin List

day-of-week

You can add tokens to the Parser to read day of the week. Since day of the week is not information that can identify a specific date, it is actually a meaningless token, but it can be used to skip that portion when the string you want to read contains a day of the week.

Parser:

Token	Meaning	Input Examples
dddd	Full day name	Friday, Sunday
ddd	Short day name	Fri, Sun
dd	Very short day name	Fr, Su

import { parse } from 'date-and-time';
import day_of_week from 'date-and-time/plugins/day_of_week';

parse(
  'Thursday, March 05, 2020', 'dddd, MMMM, D YYYY',
  { plugins: [day_of_week] }
);

microsecond

You can add tokens to the Parser to read microseconds. Since the precision of JavaScript's Date type is milliseconds, these tokens are actually meaningless, but they can be used to skip that portion when the string you want to read contains microseconds.

Parser:

Token	Meaning	Input Examples
SSSSSS	6-digit milliseconds	123456, 000001
SSSSS	5-digit milliseconds	12345, 00001
SSSS	4-digit milliseconds	1234, 0001
fff	3-digit microseconds	753, 022
ff	2-digit microseconds	75, 02
f	1-digit microseconds	7, 0

import { parse } from 'date-and-time';
import microsecond from 'date-and-time/plugins/microsecond';

parse('12:34:56.123456', 'HH:mm:ss.SSSSSS', { plugins: [microsecond] });
parse('12:34:56 123.456', 'HH:mm:ss SSS.fff', { plugins: [microsecond] });

nanosecond

You can add tokens to the Parser to read nanoseconds. Since the precision of JavaScript's Date type is milliseconds, these tokens are actually meaningless, but they can be used to skip that portion when the string you want to read contains nanoseconds.

Parser:

Token	Meaning	Input Examples
SSSSSSSSS	9-digit milliseconds	123456789, 000000001
SSSSSSSS	8-digit milliseconds	12345678, 00000001
SSSSSSS	7-digit milliseconds	1234567, 0000001
FFF	3-digit nanoseconds	753, 022
FF	2-digit nanoseconds	75, 02
F	1-digit nanoseconds	7, 0

import { parse } from 'date-and-time';
import microsecond from 'date-and-time/plugins/microsecond';
import nanosecond from 'date-and-time/plugins/nanosecond';

parse(
  '12:34:56.123456789',
  'HH:mm:ss.SSSSSSSSS',
  { plugins: [microsecond, nanosecond] }
);

parse(
  '12:34:56 123456.789',
  'HH:mm:ss SSSSSS.FFF',
  { plugins: [microsecond, nanosecond] }
);

ordinal

You can add tokens to the Formatter and Parser to output or read ordinal representations of days. This ordinal representation is limited to English and is not supported for locales other than English.

Formatter:

Token	Meaning	Output Examples
DDD	Ordinal representation of day	1st, 2nd, 3rd

import { format } from 'date-and-time';
import ordinal from 'date-and-time/plugins/ordinal';

format(new Date(), 'MMM DDD YYYY', { plugins: [ordinal] });
// => Jan 1st 2019

Parser:

Token	Meaning	Input Examples
DDD	Ordinal representation of day	1st, 2nd, 3rd

import { parse } from 'date-and-time';
import ordinal from 'date-and-time/plugins/ordinal';

parse('Jan 1st 2019', 'MMM DDD YYYY', { plugins: [ordinal] });

two-digit-year

You can add tokens to the Parser to read 2-digit years. This token identifies years based on the following rules:

• Values of 70 or above are interpreted as 1900s
• Values of 69 or below are interpreted as 2000s

Parser:

Token	Meaning	Input Examples
YY	2-digit year	90, 00, 08, 19

import { parse } from 'date-and-time';
import two_digit_year from 'date-and-time/plugins/two-digit-year';

parse('Dec 25 69', 'MMM DD YY', { plugins: [two_digit_year] });
// => Dec 25 2069
parse('Dec 25 70', 'MMM DD YY', { plugins: [two_digit_year] });
// => Dec 25 1970

zonename

You can add tokens to the Formatter to output timezone names. These timezone names are limited to English and are not supported for locales other than English.

Formatter:

Token	Meaning	Output Examples
z	Short timezone name	PST, EST
zz	Long timezone name	Pacific Standard Time

import { parse } from 'date-and-time';
import zonename from 'date-and-time/plugins/zonename';
import Tokyo from 'date-and-time/timezones/Asia/Tokyo';

format(
  new Date(),
  'MMMM DD YYYY H:mm zz',
  { plugins: [zonename] }
);
// March 14 2021 1:59 Pacific Standard Time

format(
  new Date(),
  'MMMM DD YYYY H:mm z',
  { plugins: [zonename], timeZone: Tokyo }
);
// March 14 2021 18:59 JST