Date-Utils

A collection of date-related utilities.

tl;dr

• Install by executing npm install @wojtekmaj/date-utils or yarn add @wojtekmaj/date-utils.
• Import by adding import * as dateUtils from '@wojtekmaj/date-utils'.
• Do stuff with it!

  const now = new Date();
  const startOfCentury = getCenturyStart(now);

User guide

General getters

getYear()

Gets year from a given date.

Sample usage

import { getYear } from '@wojtekmaj/date-utils';

getYear(new Date(2019, 0, 1)); // 2019

getMonth()

Gets month index from a given date. For example, returns 0 for January, 1 for February and so on.

Sample usage

import { getMonth } from '@wojtekmaj/date-utils';

getMonth(new Date(2019, 0, 1)); // 0

getMonthHuman()

Gets human-readable month number from a given date. For example, returns 1 for January, 2 for February and so on.

Sample usage

import { getMonthHuman } from '@wojtekmaj/date-utils';

getMonthHuman(new Date(2019, 0, 1)); // 1

getDate()

Gets day of the month from a given date.

Sample usage

import { getDate } from '@wojtekmaj/date-utils';

getDate(new Date(2019, 0, 15)); // 15

getHours()

Gets hours from a given date or string.

Sample usage

import { getHours } from '@wojtekmaj/date-utils';

getHours(new Date(2019, 0, 15, 22, 41, 56)); // 22
getHours('22:41'); // 22
getHours('22:41:56'); // 22

getMinutes()

Gets minutes from a given date or string.

Sample usage

import { getMinutes } from '@wojtekmaj/date-utils';

getMinutes(new Date(2019, 0, 15, 22, 41, 56)); // 41
getMinutes('22:41'); // 41
getMinutes('22:41:56'); // 41

getSeconds()

Gets seconds from a given date or string.

Sample usage

import { getSeconds } from '@wojtekmaj/date-utils';

getSeconds(new Date(2019, 0, 15, 22, 41, 56)); // 56
getSeconds('22:41'); // 0
getSeconds('22:41:56'); // 56
getSeconds('22:41:56.321'); // 56

getMilliseconds()

Gets milliseconds from a given date or string.

Sample usage

import { getMilliseconds } from '@wojtekmaj/date-utils';

getMilliseconds(new Date(2019, 0, 15, 22, 41, 56, 321)); // 321
getMilliseconds('22:41'); // 0
getMilliseconds('22:41:56'); // 0
getMilliseconds('22:41:56.321'); // 321

Century-related getters

getCenturyStart()

Gets century start date from a given date.

Sample usage

import { getCenturyStart } from '@wojtekmaj/date-utils';

getCenturyStart(new Date(2019, 0, 1)); // new Date(2001, 0, 1)

getCenturyEnd()

Gets century start date from a given date.

Sample usage

import { getCenturyEnd } from '@wojtekmaj/date-utils';

getCenturyEnd(new Date(2019, 0, 1)); // new Date(2100, 12, 31, 23, 59, 999)

getPreviousCenturyStart()

Gets previous century start date from a given date.

Sample usage

import { getPreviousCenturyStart } from '@wojtekmaj/date-utils';

getPreviousCenturyStart(new Date(2019, 0, 1)); // new Date(1901, 0, 1)

getPreviousCenturyEnd()

Gets century start date from a given date.

Sample usage

import { getPreviousCenturyEnd } from '@wojtekmaj/date-utils';

getPreviousCenturyEnd(new Date(2019, 0, 1)); // new Date(2000, 12, 31, 23, 59, 999)

getNextCenturyStart()

Gets next century start date from a given date.

Sample usage

import { getNextCenturyStart } from '@wojtekmaj/date-utils';

getNextCenturyStart(new Date(2019, 0, 1)); // new Date(2101, 0, 1)

getNextCenturyEnd()

Gets next century start date from a given date.

Sample usage

import { getNextCenturyEnd } from '@wojtekmaj/date-utils';

getNextCenturyEnd(new Date(2019, 0, 1)); // new Date(2200, 12, 31, 23, 59, 999)

getCenturyRange()

Gets century start and end dates from a given date. Returns an array of values equal to the ones returned by getCenturyStart() and getCenturyEnd().

Sample usage

import { getCenturyRange } from '@wojtekmaj/date-utils';

getCenturyRange(new Date(2019, 0, 1)); // [new Date(2001, 0, 1), new Date(2100, 12, 31, 23, 59, 999)

Decade-related getters

getDecadeStart()

Gets decade start date from a given date.

Sample usage

import { getDecadeStart } from '@wojtekmaj/date-utils';

getDecadeStart(new Date(2019, 0, 1)); // new Date(2011, 0, 1)

getDecadeEnd()

Gets decade start date from a given date.

Sample usage

import { getDecadeEnd } from '@wojtekmaj/date-utils';

getDecadeEnd(new Date(2019, 0, 1)); // new Date(2020, 12, 31, 23, 59, 999)

getPreviousDecadeStart()

Gets previous decade start date from a given date.

Sample usage

import { getPreviousDecadeStart } from '@wojtekmaj/date-utils';

getPreviousDecadeStart(new Date(2019, 0, 1)); // new Date(2001, 0, 1)

getPreviousDecadeEnd()

Gets decade start date from a given date.

Sample usage

import { getPreviousDecadeEnd } from '@wojtekmaj/date-utils';

getPreviousDecadeEnd(new Date(2019, 0, 1)); // new Date(2010, 12, 31, 23, 59, 999)

getNextDecadeStart()

Gets next decade start date from a given date.

Sample usage

import { getNextDecadeStart } from '@wojtekmaj/date-utils';

getNextDecadeStart(new Date(2019, 0, 1)); // new Date(2021, 0, 1)

getNextDecadeEnd()

Gets next decade start date from a given date.

Sample usage

import { getNextDecadeEnd } from '@wojtekmaj/date-utils';

getNextDecadeEnd(new Date(2019, 0, 1)); // new Date(2030, 12, 31, 23, 59, 999)

getDecadeRange()

Gets decade start and end dates from a given date. Returns an array of values equal to the ones returned by getDecadeStart() and getDecadeEnd().

Sample usage

import { getDecadeRange } from '@wojtekmaj/date-utils';

getDecadeRange(new Date(2019, 0, 1)); // [new Date(2011, 0, 1), new Date(2020, 12, 31, 23, 59, 999)

Year-related getters

getYearStart()

Gets year start date from a given date.

Sample usage

import { getYearStart } from '@wojtekmaj/date-utils';

getYearStart(new Date(2019, 6, 1)); // new Date(2019, 0, 1)

getYearEnd()

Gets year start date from a given date.

Sample usage

import { getYearEnd } from '@wojtekmaj/date-utils';

getYearEnd(new Date(2019, 6, 1)); // new Date(2019, 12, 31, 23, 59, 999)

getPreviousYearStart()

Gets previous year start date from a given date.

Sample usage

import { getPreviousYearStart } from '@wojtekmaj/date-utils';

getPreviousYearStart(new Date(2019, 6, 1)); // new Date(2018, 0, 1)

getPreviousYearEnd()

Gets year start date from a given date.

Sample usage

import { getPreviousYearEnd } from '@wojtekmaj/date-utils';

getPreviousYearEnd(new Date(2019, 6, 1)); // new Date(2018, 12, 31, 23, 59, 999)

getNextYearStart()

Gets next year start date from a given date.

Sample usage

import { getNextYearStart } from '@wojtekmaj/date-utils';

getNextYearStart(new Date(2019, 6, 1)); // new Date(2020, 0, 1)

getNextYearEnd()

Gets next year start date from a given date.

Sample usage

import { getNextYearEnd } from '@wojtekmaj/date-utils';

getNextYearEnd(new Date(2019, 6, 1)); // new Date(2020, 12, 31, 23, 59, 999)

getYearRange()

Gets year start and end dates from a given date. Returns an array of values equal to the ones returned by getYearStart() and getYearEnd().

Sample usage

import { getYearRange } from '@wojtekmaj/date-utils';

getYearRange(new Date(2019, 6, 1)); // [new Date(2019, 0, 1), new Date(2019, 12, 31, 23, 59, 999)

Month-related getters

getMonthStart()

Gets month start date from a given date.

Sample usage

import { getMonthStart } from '@wojtekmaj/date-utils';

getMonthStart(new Date(2019, 6, 15)); // new Date(2019, 6, 1)

getMonthEnd()

Gets month start date from a given date.

Sample usage

import { getMonthEnd } from '@wojtekmaj/date-utils';

getMonthEnd(new Date(2019, 6, 15)); // new Date(2019, 6, 31, 23, 59, 999)

getPreviousMonthStart()

Gets previous month start date from a given date.

Sample usage

import { getPreviousMonthStart } from '@wojtekmaj/date-utils';

getPreviousMonthStart(new Date(2019, 6, 15)); // new Date(2019, 5, 1)

getPreviousMonthEnd()

Gets month start date from a given date.

Sample usage

import { getPreviousMonthEnd } from '@wojtekmaj/date-utils';

getPreviousMonthEnd(new Date(2019, 6, 15)); // new Date(2019, 5, 30, 23, 59, 999)

getNextMonthStart()

Gets next month start date from a given date.

Sample usage

import { getNextMonthStart } from '@wojtekmaj/date-utils';

getNextMonthStart(new Date(2019, 6, 15)); // new Date(2019, 7, 1)

getNextMonthEnd()

Gets next month start date from a given date.

Sample usage

import { getNextMonthEnd } from '@wojtekmaj/date-utils';

getNextMonthEnd(new Date(2019, 6, 15)); // new Date(2019, 7, 31, 23, 59, 999)

getMonthRange()

Gets month start and end dates from a given date. Returns an array of values equal to the ones returned by getMonthStart() and getMonthEnd().

Sample usage

import { getMonthRange } from '@wojtekmaj/date-utils';

getMonthRange(new Date(2019, 6, 15)); // [new Date(2019, 6, 1), new Date(2019, 6, 31, 23, 59, 999)

Day-related getters

getDayStart()

Gets day start date from a given date.

Sample usage

import { getDayStart } from '@wojtekmaj/date-utils';

getDayStart(new Date(2019, 6, 15, 12)); // new Date(2019, 6, 15)

getDayEnd()

Gets day start date from a given date.

Sample usage

import { getDayEnd } from '@wojtekmaj/date-utils';

getDayEnd(new Date(2019, 6, 15, 12)); // new Date(2019, 6, 15, 23, 59, 999)

getPreviousDayStart()

Gets previous day start date from a given date.

Sample usage

import { getPreviousDayStart } from '@wojtekmaj/date-utils';

getPreviousDayStart(new Date(2019, 6, 15, 12)); // new Date(2019, 6, 14)

getPreviousDayEnd()

Gets day start date from a given date.

Sample usage

import { getPreviousDayEnd } from '@wojtekmaj/date-utils';

getPreviousDayEnd(new Date(2019, 6, 15, 12)); // new Date(2019, 6, 14, 23, 59, 999)

getNextDayStart()

Gets next day start date from a given date.

Sample usage

import { getNextDayStart } from '@wojtekmaj/date-utils';

getNextDayStart(new Date(2019, 6, 15, 12)); // new Date(2019, 6, 16)

getNextDayEnd()

Gets next day start date from a given date.

Sample usage

import { getNextDayEnd } from '@wojtekmaj/date-utils';

getNextDayEnd(new Date(2019, 6, 15, 12)); // new Date(2019, 6, 16, 23, 59, 999)

getDayRange()

Gets day start and end dates from a given date. Returns an array of values equal to the ones returned by getDayStart() and getDayEnd().

Sample usage

import { getDayRange } from '@wojtekmaj/date-utils';

getDayRange(new Date(2019, 6, 15, 12)); // [new Date(2019, 6, 15), new Date(2019, 6, 15, 23, 59, 999)

Other

getDaysInMonth()

Gets number of days in a month from a given date.

Sample usage

import { getDaysInMonth } from '@wojtekmaj/date-utils';

getDaysInMonth(new Date(2019, 0, 15)); // 31

getHoursMinutes()

Returns local hours and minutes (hh:mm).

Sample usage

import { getHoursMinutes } from '@wojtekmaj/date-utils';

getHoursMinutes(new Date(2019, 0, 15, 16, 4)); // "16:04"

getHoursMinutesSeconds()

Returns local hours, minutes and seconds (hh:mm:ss).

Sample usage

import { getHoursMinutesSeconds } from '@wojtekmaj/date-utils';

getHoursMinutesSeconds(new Date(2019, 0, 15, 16, 4, 41)); // "16:04:41"

getISOLocalMonth()

Returns local month in ISO-like format (YYYY-MM).

Sample usage

import { getISOLocalMonth } from '@wojtekmaj/date-utils';

getISOLocalMonth(new Date(2019, 0, 15)); // "2019-01"

getISOLocalDate()

Returns local date in ISO-like format (YYYY-MM-DD).

Sample usage

import { getISOLocalDate } from '@wojtekmaj/date-utils';

getISOLocalDate(new Date(2019, 0, 15)); // "2019-01-15"

getISOLocalDateTime()

Returns local date & time in ISO-like format (YYYY-MM-DDThh:mm:ss).

Sample usage

import { getISOLocalDateTime } from '@wojtekmaj/date-utils';

getISOLocalDateTime(new Date(2019, 0, 15, 16, 4, 41)); // "2019-01-15T16:04:41"

License

The MIT License.

Author

Wojciech Maj