date-and-time

What is date-and-time?

The date-and-time npm package is a lightweight library for date and time manipulation in JavaScript. It provides a variety of functions for parsing, formatting, adding, subtracting, and comparing dates and times.

What are date-and-time's main functionalities?

Formatting Dates

This feature allows you to format dates into various string representations. The format method takes a date object and a format string as arguments.

const date = new Date(2023, 9, 10);
const dateAndTime = require('date-and-time');
const formattedDate = dateAndTime.format(date, 'YYYY/MM/DD HH:mm:ss');
console.log(formattedDate); // Output: 2023/10/10 00:00:00

Parsing Dates

This feature allows you to parse date strings into JavaScript Date objects. The parse method takes a date string and a format string as arguments.

const dateAndTime = require('date-and-time');
const dateString = '2023/10/10 00:00:00';
const parsedDate = dateAndTime.parse(dateString, 'YYYY/MM/DD HH:mm:ss');
console.log(parsedDate); // Output: Tue Oct 10 2023 00:00:00 GMT+0000 (Coordinated Universal Time)

Adding and Subtracting Time

This feature allows you to add or subtract time units (days, months, years, etc.) from a date. The addDays and addMonths methods are used in this example.

const dateAndTime = require('date-and-time');
let date = new Date(2023, 9, 10);
date = dateAndTime.addDays(date, 5);
console.log(date); // Output: Sun Oct 15 2023 00:00:00 GMT+0000 (Coordinated Universal Time)
date = dateAndTime.addMonths(date, -1);
console.log(date); // Output: Fri Sep 15 2023 00:00:00 GMT+0000 (Coordinated Universal Time)

Comparing Dates

This feature allows you to compare dates. The isSameDay method checks if two dates fall on the same day.

const dateAndTime = require('date-and-time');
const date1 = new Date(2023, 9, 10);
const date2 = new Date(2023, 9, 15);
const isSameDay = dateAndTime.isSameDay(date1, date2);
console.log(isSameDay); // Output: false

Other packages similar to date-and-time

moment

Moment.js is a widely-used library for date and time manipulation. It offers extensive functionality for parsing, validating, manipulating, and formatting dates. Compared to date-and-time, Moment.js is more feature-rich but also larger in size.

date-fns

date-fns is a modern JavaScript date utility library that provides a comprehensive set of functions for date manipulation. It is modular, allowing you to import only the functions you need, making it more lightweight compared to Moment.js. date-fns is similar to date-and-time in terms of functionality but offers a more functional programming approach.

luxon

Luxon is a modern library for working with dates and times in JavaScript. It is built by one of the Moment.js developers and offers a more modern API with better support for internationalization. Luxon is more feature-rich than date-and-time and is designed to be a more modern alternative to Moment.js.

README

date-and-time

WHY

Since JS modules are usually used in combination, we think trying to keep the size of each module small is important. This date time utility is one of the modules aiming for minimal and efficient.

Features

• Minimalist. Only has 1.9k (minified and gzipped)
• Universal (Isomorphic)
• Multi language support
• Not extending built-in Date object
• Browserify support
• Legacy IE support. IE6+

Installation

via npm:

$ npm install date-and-time --save

via Bower (DEPRECATED):

$ bower install date-and-time

directly:

<script src="date-and-time.min.js"></script>

Changes

• parse()
  • Parsing a string stricter
  • Added white space as a wildcard character
  • Fixed a daylight saving time issue

Usage

Node.js:

let date = require('date-and-time');

babelify:

import date from './date-and-time';

AMD:

require(['date-and-time'], function (date) {
});

the browser:

window.date;    // global object

API

format(dateObj, formatString[, utc])

• {object} dateObj - date object
• {string} formatString - format string
• {boolean} [utc] - output as UTC (optional)

let now = new Date();
date.format(now, 'YYYY/MM/DD HH:mm:ss');    // => '2015/01/02 23:14:05'
date.format(now, 'ddd MMM DD YYYY');        // => 'Fri Jan 02 2015'
date.format(now, 'hh:mm A [GMT]Z');         // => '11:14 p.m. GMT-0800'
date.format(now, 'hh:mm A [GMT]Z', true);   // => '07:14 a.m. GMT+0000'

token	meaning	example
YYYY	year	0999, 2015
YY	year	15, 99
Y	year	999, 2015
MMMM	month	January, December
MMM	month	Jan, Dec
MM	month	01, 12
M	month	1, 12
DD	day	02, 31
D	day	2, 31
dddd	day of week	Friday, Sunday
ddd	day of week	Fri, Sun
dd	day of week	Fr, Su
HH	hour-24	23, 08
H	hour-24	23, 8
A	meridiem	a.m., p.m.
hh	hour-12	11, 08
h	hour-12	11, 8
mm	minute	14, 07
m	minute	14, 7
ss	second	05, 10
s	second	5, 10
SSS	millisecond	753, 022
SS	millisecond	75, 02
S	millisecond	7, 0
Z	timezone	+0100, -0800

NOTE

[...] in the formatString will be a comment:

date.format(new Date(), 'DD-[MM]-YYYY');    // => '02-MM-2015'
date.format(new Date(), '[DD-[MM]-YYYY]');  // => 'DD-[MM]-YYYY'

parse(dateString, formatString[, utc])

• {string} dateString - date string
• {string} formatString - format string
• {boolean} [utc] - input as UTC (optional)

date.parse('2015/01/02 23:14:05', 'YYYY/MM/DD HH:mm:ss');   // => date object
date.parse('02-01-2015', 'DD-MM-YYYY');                     // => date object
date.parse('11:14:05 p.m.', 'hh:mm:ss A');                  // => (Jan 1 1970 23:14:05 GMT-0800)
date.parse('11:14:05 p.m.', 'hh:mm:ss A', true);            // => (Jan 1 1970 15:14:05 GMT-0800)
date.parse('Jam 1 2017', 'MMM D YYYY');                     // => NaN
date.parse('Feb 29 2016', 'MMM D YYYY');                    // => date object
date.parse('Feb 29 2017', 'MMM D YYYY');                    // => NaN

token	meaning	example
YYYY	year	2015, 1999
YY	year	15, 99
MMMM	month	January, December
MMM	month	Jan, Dec
MM	month	01, 12
M	month	1, 12
DD	day	02, 31
D	day	2, 31
HH	hour-24	23, 08
H	hour-24	23, 8
hh	hour-12	11, 08
h	hour-12	11, 8
A	meridiem	a.m., p.m.
mm	minute	14, 07
m	minute	14, 7
ss	second	05, 10
s	second	5, 10
SSS	millisecond	753, 022
SS	millisecond	75, 02
S	millisecond	7, 0

NOTE 1

The minimum year that can be parsed is year 100, the maximum year is year 9999. Year 69 or less are translated into 2000s, year 70 or more and year 99 or less are translated into 1900s.

date.parse('Dec 31 100', 'MMM d YYYY');     // => (Dec 31 100)
date.parse('Dec 31 9999', 'MMM d YYYY');    // => (Dec 31 9999)
date.parse('Dec 31 0', 'MMM d YYYY');       // => (Dec 31 2000)
date.parse('Dec 31 69', 'MMM d YYYY');      // => (Dec 31 2069)
date.parse('Dec 31 70', 'MMM d YYYY');      // => (Dec 31 1970)
date.parse('Dec 31 99', 'MMM d YYYY');      // => (Dec 31 1999)

NOTE 2

When using hh or h (hour-12), need to use together A (meridiem).

isValid(dateString, formatString)

• {string} dateString - date string
• {string} formatString - format string

date.isValid('2015/01/02 23:14:05', 'YYYY/MM/DD HH:mm:ss'); // => true
date.isValid('29-02-2015', 'DD-MM-YYYY');                   // => false

The formatString you can set is the same as the parse function's.

addYears(dateObj, years)

• {object} dateObj - date object
• {number} years - adding year

let now = new Date();
let next_year = date.addYears(now, 1);  // => Date object

addMonths(dateObj, months)

• {object} dateObj - date object
• {number} months - adding month

let now = new Date();
let next_month = date.addMonths(now, 1); // => Date object

addDays(dateObj, days)

• {object} dateObj - date object
• {number} days - adding day

let now = new Date();
let yesterday = date.addDays(now, -1);  // => Date object

addHours(dateObj, hours)

• {object} dateObj - date object
• {number} hours - adding hour

let now = new Date();
let an_hour_ago = date.addHours(now, -1); // => Date object

addMinutes(dateObj, minutes)

• {object} dateObj - date object
• {number} minutes - adding minute

let now = new Date();
let two_minutes_later = date.addMinutes(now, 2);    // => Date object

addSeconds(dateObj, seconds)

• {object} dateObj - date object
• {number} seconds - adding second

let now = new Date();
let three_seconds_ago = date.addSeconds(now, -3);   // => Date object

addMilliseconds(dateObj, milliseconds)

• {object} dateObj - date object
• {number} milliseconds - adding millisecond

let now = new Date();
let a_millisecond_later = date.addMilliseconds(now, 1); // => Date object

subtract(dateObj1, dateObj2)

• {object} date1 - date object
• {object} date2 - date object

let today = new Date(2015, 0, 2);
let yesterday = new Date(2015, 0, 1);

date.subtract(today, yesterday).toDays();           // => 1 = today - yesterday
date.subtract(today, yesterday).toHours();          // => 24
date.subtract(today, yesterday).toMinutes();        // => 1440
date.subtract(today, yesterday).toSeconds();        // => 86400
date.subtract(today, yesterday).toMilliseconds();   // => 86400000

isLeapYear(dateObj)

• {object} dateObj - date object

let date1 = new Date(2015, 0, 2);
let date2 = new Date(2012, 0, 2);
date.isLeapYear(date1); // => false
date.isLeapYear(date2); // => true

isSameDay(dateObj)

• {object} date1 - date object
• {object} date2 - date object

let date1 = new Date(2017, 0, 2, 0);        // Jan 2 2017 00:00:00
let date2 = new Date(2017, 0, 2, 23, 59);   // Jan 2 2017 23:59:00
let date3 = new Date(2017, 0, 1, 23, 59);   // Jan 1 2017 23:59:00
date.isSameDay(date1, date2);   // => true
date.isSameDay(date1, date3);   // => false

Locale

It supports the following languages for now:

• Arabic (ar)
• Azerbaijani (az)
• Bengali (bn)
• Burmese (my)
• Chinese (zh-cn)
• Chinese (zh-tw)
• Czech (cs)
• Dutch (nl)
• English (en)
• French (fr)
• German (de)
• Greek (el)
• Hindi (hi)
• Hungarian (hu)
• Indonesian (id)
• Italian (it)
• Japanese (ja)
• Javanese (jv)
• Korean (ko)
• Persian (fa)
• Polish (pl)
• Portuguese (pt)
• Punjabi (pa-in)
• Romanian (ro)
• Russian (ru)
• Serbian (sr)
• Spanish (es)
• Thai (th)
• Turkish (tr)
• Ukrainian (uk)
• Uzbek (uz)
• Vietnamese (vi)

Month, day of week, and meridiem are displayed in English by default. If you want to use other languages, can switch to them as follows:
Node.js:

let date = require('date-and-time');
date.locale('fr');  // French
date.format(new Date(), 'dddd D MMMM'); // => 'lundi 11 janvier'

babelify:

import date from './date-and-time';
import './locale/it';

date.locale('it');  // Italian
date.format(new Date(), 'dddd D MMMM'); // => 'Lunedì 11 gennaio'

AMD:

require(['date-and-time', 'locale/de'], function (date) {
    date.locale('de');  // German
    date.format(new Date(), 'dddd, D. MMMM');   // => 'Montag, 11. Januar'
});

the browser:

<script src="date-and-time.min.js"></script>
<script src="locale/zh-cn.js"></script>
<script>
date.locale('zh-cn');  // Chinese
date.format(new Date(), 'MMMD日dddd');  // => '1月11日星期一'
</script>

Customizing

You can not only switch to other languages, but can customize them as you want:

let now = new Date();
date.format(now, 'h:m A');  // => '12:34 p.m.'

date.setLocales('en', {
    A: ['AM', 'PM']
});

date.format(now, 'h:m A');  // => '12:34 PM'

Browser Support

Chrome, Firefox, Safari, Opera, and Internet Explorer 6+.

License

MIT