Time-keeper NPM

TimeKeeper.js

A simple date-time library.

Features

simple api
- no support milliseconds.
- no support day of weeks.
- no support DST: daylight saving time (summer time).
- no flexible formatter.
- no invalid state.
- no mutable state.
typescript support

Installation

$ npm install time-keeper

Example

import * as assert from 'assert';
import {
  get,
  inTimeZone,
  isLeapYear,
  now,
  parseISOString,
  parseUNIXTime,
  plus,
  toISOString,
  toTimeZoneOffsetString,
  toUNIXTime
} from 'time-keeper';

// You can also use import by function.
// import { get } from 'time-keeper/get';
// import { inTimeZone } from 'time-keeper/in-time-zone';
// import { isLeapYear } from 'time-keeper/is-leap-year';
// import { now } from 'time-keeper/now';
// import { parseISOString } from 'time-keeper/parse-iso-string';
// import { parseUNIXTime } from 'time-keeper/parse-unix-time';
// import { plus } from 'time-keeper/plus';
// import { toISOString } from 'time-keeper/to-iso-string';
// import { toTimeZoneOffsetString } from 'time-keeper/to-time-zone-offset-string';
// import { toUNIXTime } from 'time-keeper/to-unix-time';

const dt1 = now();
const dt2 = parseUNIXTime(toUNIXTime(dt1));
assert(toUNIXTime(dt1) === toUNIXTime(dt2));

const dt3 = parseISOString('2006-06-17T23:28:40+09:00');
assert(get(dt3, 'year') === 2006);
assert(get(dt3, 'month') === 6);
assert(get(dt3, 'date') === 17);
assert(get(dt3, 'hour') === 23);
assert(get(dt3, 'minute') === 28);
assert(get(dt3, 'second') === 40);
assert(toTimeZoneOffsetString(dt3) === '+09:00');
assert(isLeapYear(dt3) === false);

const dt4 = inTimeZone(dt3, '+02:00');
assert(toISOString(dt3) === '2006-06-17T23:28:40+09:00');
assert(toISOString(dt4) === '2006-06-17T16:28:40+02:00');

const dt5 = plus(dt4, 2, 'day');
assert(toISOString(dt4) === '2006-06-17T16:28:40+02:00');
assert(toISOString(dt5) === '2006-06-19T16:28:40+02:00');

See: src/.