60 lines
1.9 KiB
JavaScript
60 lines
1.9 KiB
JavaScript
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"use strict";
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exports.differenceInCalendarISOWeeks = differenceInCalendarISOWeeks;
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var _index = require("./_lib/getTimezoneOffsetInMilliseconds.cjs");
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var _index2 = require("./_lib/normalizeDates.cjs");
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var _index3 = require("./constants.cjs");
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var _index4 = require("./startOfISOWeek.cjs");
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/**
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* The {@link differenceInCalendarISOWeeks} function options.
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*/
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/**
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* @name differenceInCalendarISOWeeks
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* @category ISO Week Helpers
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* @summary Get the number of calendar ISO weeks between the given dates.
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*
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* @description
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* Get the number of calendar ISO weeks between the given dates.
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*
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* ISO week-numbering year: http://en.wikipedia.org/wiki/ISO_week_date
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*
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* @param laterDate - The later date
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* @param earlierDate - The earlier date
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* @param options - An object with options
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*
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* @returns The number of calendar ISO weeks
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*
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* @example
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* // How many calendar ISO weeks are between 6 July 2014 and 21 July 2014?
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* const result = differenceInCalendarISOWeeks(
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* new Date(2014, 6, 21),
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* new Date(2014, 6, 6),
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* );
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* //=> 3
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*/
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function differenceInCalendarISOWeeks(laterDate, earlierDate, options) {
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const [laterDate_, earlierDate_] = (0, _index2.normalizeDates)(
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options?.in,
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laterDate,
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earlierDate,
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);
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const startOfISOWeekLeft = (0, _index4.startOfISOWeek)(laterDate_);
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const startOfISOWeekRight = (0, _index4.startOfISOWeek)(earlierDate_);
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const timestampLeft =
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+startOfISOWeekLeft -
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(0, _index.getTimezoneOffsetInMilliseconds)(startOfISOWeekLeft);
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const timestampRight =
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+startOfISOWeekRight -
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(0, _index.getTimezoneOffsetInMilliseconds)(startOfISOWeekRight);
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// Round the number of weeks to the nearest integer because the number of
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// milliseconds in a week is not constant (e.g. it's different in the week of
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// the daylight saving time clock shift).
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return Math.round(
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(timestampLeft - timestampRight) / _index3.millisecondsInWeek,
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);
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}
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