fecha

Lightweight date formatting and parsing (~2KB). Meant to replace parsing and formatting functionality of moment.js.

NPM

npm install fecha --save

Yarn

yarn add fecha

Fecha vs Moment

	Fecha	Moment
Size (Min. and Gzipped)	2.1KBs	13.1KBs
Date Parsing	✓	✓
Date Formatting	✓	✓
Date Manipulation		✓
I18n Support	✓	✓

Use it

Formatting

format accepts a Date object (or timestamp) and a string format and returns a formatted string. See below for available format tokens.

Note: format will throw an error when passed invalid parameters

import { format } from 'fecha';

type format = (date: Date, format?: string, i18n?: I18nSettings) => str;

// Custom formats
format(new Date(2015, 10, 20), 'dddd MMMM Do, YYYY'); // 'Friday November 20th, 2015'
format(new Date(1998, 5, 3, 15, 23, 10, 350), 'YYYY-MM-DD hh:mm:ss.SSS A'); // '1998-06-03 03:23:10.350 PM'

// Named masks
format(new Date(2015, 10, 20), 'isoDate'); // '2015-11-20'
format(new Date(2015, 10, 20), 'mediumDate'); // 'Nov 20, 2015'
format(new Date(2015, 10, 20, 3, 2, 1), 'isoDateTime'); // '2015-11-20T03:02:01-05:00'
format(new Date(2015, 2, 10, 5, 30, 20), 'shortTime'); // '05:30'

// Literals
format(new Date(2001, 2, 5, 6, 7, 2, 5), '[on] MM-DD-YYYY [at] HH:mm'); // 'on 03-05-2001 at 06:07'

Parsing

parse accepts a Date string and a string format and returns a Date object. See below for available format tokens.

NOTE: parse will throw an error when passed invalid string format or missing format. You MUST specify a format.

import { parse } from 'fecha';

type parse = (dateStr: string, format: string, i18n?: I18nSettingsOptional) => Date|null;

// Custom formats
parse('February 3rd, 2014', 'MMMM Do, YYYY'); // new Date(2014, 1, 3)
parse('10-12-10 14:11:12', 'YY-MM-DD HH:mm:ss'); // new Date(2010, 11, 10, 14, 11, 12)

// Named masks
parse('5/3/98', 'shortDate'); // new Date(1998, 4, 3)
parse('November 4, 2005', 'longDate'); // new Date(2005, 10, 4)
parse('2015-11-20T03:02:01-05:00', 'isoDateTime'); // new Date(2015, 10, 20, 3, 2, 1)

// Override i18n
parse('4 de octubre de 1983', 'M de MMMM de YYYY', {
  monthNames: [
    'enero',
    'febrero',
    'marzo',
    'abril',
    'mayo',
    'junio',
    'julio',
    'agosto',
    'septiembre',
    'octubre',
    'noviembre',
    'diciembre'
  ]
}); // new Date(1983, 9, 4)

i18n Support

import {setGlobalDateI18n} from 'fecha';

/*
Default I18n Settings
{
  dayNamesShort: ['Sun', 'Mon', 'Tue', 'Wed', 'Thur', 'Fri', 'Sat'],
  dayNames: ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'],
  monthNamesShort: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'],
  monthNames: ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'],
  amPm: ['am', 'pm'],
  // D is the day of the month, function returns something like...  3rd or 11th
  DoFn(dayOfMonth) {
    return dayOfMonth + [ 'th', 'st', 'nd', 'rd' ][ dayOfMonth % 10 > 3 ? 0 : (dayOfMonth - dayOfMonth % 10 !== 10) * dayOfMonth % 10 ];
  }
}
*/

setGlobalDateI18n({
  dayNamesShort: ['Sun', 'Mon', 'Tue', 'Wed', 'Thur', 'Fri', 'Sat'],
  dayNames: ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'],
  monthNamesShort: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'],
  monthNames: ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'],
  amPm: ['am', 'pm'],
  // D is the day of the month, function returns something like...  3rd or 11th
  DoFn: function (D) {
    return D + [ 'th', 'st', 'nd', 'rd' ][ D % 10 > 3 ? 0 : (D - D % 10 !== 10) * D % 10 ];
  }
});

Custom Named Masks

import { format, setGlobalDateMasks } from 'fecha';
/*
Default global masks
{
  default: 'ddd MMM DD YYYY HH:mm:ss',
  shortDate: 'M/D/YY',
  mediumDate: 'MMM D, YYYY',
  longDate: 'MMMM D, YYYY',
  fullDate: 'dddd, MMMM D, YYYY',
  shortTime: 'HH:mm',
  mediumTime: 'HH:mm:ss',
  longTime: 'HH:mm:ss.SSS'
}
*/

// Create a new mask
setGlobalDateMasks({
  myMask: 'HH:mm:ss YY/MM/DD';
});

// Use it
format(new Date(2014, 5, 6, 14, 10, 45), 'myMask'); // '14:10:45 14/06/06'

Formatting Tokens

	Token	Output
Month	M	1 2 ... 11 12
	MM	01 02 ... 11 12
	MMM	Jan Feb ... Nov Dec
	MMMM	January February ... November December
Day of Month	D	1 2 ... 30 31
	Do	1st 2nd ... 30th 31st
	DD	01 02 ... 30 31
Day of Week	d	0 1 ... 5 6
	ddd	Sun Mon ... Fri Sat
	dddd	Sunday Monday ... Friday Saturday
Year	YY	70 71 ... 29 30
	YYYY	1970 1971 ... 2029 2030
AM/PM	A	AM PM
	a	am pm
Hour	H	0 1 ... 22 23
	HH	00 01 ... 22 23
	h	1 2 ... 11 12
	hh	01 02 ... 11 12
Minute	m	0 1 ... 58 59
	mm	00 01 ... 58 59
Second	s	0 1 ... 58 59
	ss	00 01 ... 58 59
Fractional Second	S	0 1 ... 8 9
	SS	0 1 ... 98 99
	SSS	0 1 ... 998 999
Timezone	Z	-07:00 -06:00 ... +06:00 +07:00
	ZZ	-0700 -0600 ... +0600 +0700

lelandmiller/fecha