50 lines
1.9 KiB
JavaScript
50 lines
1.9 KiB
JavaScript
import differenceInDays from "../differenceInDays/index.js";
|
|
import requiredArgs from "../_lib/requiredArgs/index.js";
|
|
import { getRoundingMethod } from "../_lib/roundingMethods/index.js";
|
|
/**
|
|
* @name differenceInWeeks
|
|
* @category Week Helpers
|
|
* @summary Get the number of full weeks between the given dates.
|
|
*
|
|
* @description
|
|
* Get the number of full weeks between two dates. Fractional weeks are
|
|
* truncated towards zero by default.
|
|
*
|
|
* One "full week" is the distance between a local time in one day to the same
|
|
* local time 7 days earlier or later. A full week can sometimes be less than
|
|
* or more than 7*24 hours if a daylight savings change happens between two dates.
|
|
*
|
|
* To ignore DST and only measure exact 7*24-hour periods, use this instead:
|
|
* `Math.floor(differenceInHours(dateLeft, dateRight)/(7*24))|0`.
|
|
*
|
|
*
|
|
* @param {Date|Number} dateLeft - the later date
|
|
* @param {Date|Number} dateRight - the earlier date
|
|
* @param {Object} [options] - an object with options.
|
|
* @param {String} [options.roundingMethod='trunc'] - a rounding method (`ceil`, `floor`, `round` or `trunc`)
|
|
* @returns {Number} the number of full weeks
|
|
* @throws {TypeError} 2 arguments required
|
|
*
|
|
* @example
|
|
* // How many full weeks are between 5 July 2014 and 20 July 2014?
|
|
* const result = differenceInWeeks(new Date(2014, 6, 20), new Date(2014, 6, 5))
|
|
* //=> 2
|
|
*
|
|
* // How many full weeks are between
|
|
* // 1 March 2020 0:00 and 6 June 2020 0:00 ?
|
|
* // Note: because local time is used, the
|
|
* // result will always be 8 weeks (54 days),
|
|
* // even if DST starts and the period has
|
|
* // only 54*24-1 hours.
|
|
* const result = differenceInWeeks(
|
|
* new Date(2020, 5, 1),
|
|
* new Date(2020, 2, 6)
|
|
* )
|
|
* //=> 8
|
|
*/
|
|
|
|
export default function differenceInWeeks(dateLeft, dateRight, options) {
|
|
requiredArgs(2, arguments);
|
|
var diff = differenceInDays(dateLeft, dateRight) / 7;
|
|
return getRoundingMethod(options === null || options === void 0 ? void 0 : options.roundingMethod)(diff);
|
|
} |