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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 Wojciech Maj

date-utils's People

Contributors

akihironagai avatar dependabot[bot] avatar felixmosh avatar wojtekmaj avatar

Stargazers

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Watchers

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Forkers

felixmosh narendrayogi rkterungwa16 libraries-packages ohardy arcataroger

date-utils's Issues

Adding functions

Hi there, thanks for the amazing lib.
I would like to add more functions to this library.

updated README

https://github.com/leesei/date-utils/commit/a04b82e7ed9b29cbf26b4c018a01650346308443
add ISO/ISO-like strings section

week number

https://www.wikiwand.com/en/ISO_week_date
Will base on implementation in https://stackoverflow.com/a/6117889
Tests will be added with Wiki's data.

Please comment on these API:

getISOWeekNumber(date: Date | string) => number  (50)
getISOWeek(date: Date | string) => string        ("W50")
getISOWeekDay(date: Date | string) => string     ("W504" or "W50-4")
getISOWeekFull(date: Date | string) => string    ("2020W50")
getISOWeekDayFull(date: Date | string) => string ("20202020W504" or "20202020W50-4")

getMonday

/**
 * Gets Monday in the same week.
 *
 * @param {Date} date Date to get Monday from.
 * @param {Date} startWithSunday Whether week starts with Sunday
 */
export const getMonday = (date, startWithSunday = false) => {
  const dayStartDate = getDayStart(date);
  const day = dayStartDate.getDay();
  let mondayRel = -(day - 1); // default value
  if (day === 0) {
    // adjust when day is Sunday
    mondayRel = (startWithSunday)? 1 : -6;
  }
  console.log("Monday is %d days difference", mondayRel);

  return getPreviousDayStart(dayStartDate, mondayRel);
};

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