58f8093689
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39 lines
1.4 KiB
JavaScript
39 lines
1.4 KiB
JavaScript
"use strict";
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exports.endOfISOWeekYear = endOfISOWeekYear;
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var _index = require("./getISOWeekYear.js");
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var _index2 = require("./startOfISOWeek.js");
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var _index3 = require("./constructFrom.js");
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/**
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* @name endOfISOWeekYear
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* @category ISO Week-Numbering Year Helpers
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* @summary Return the end of an ISO week-numbering year for the given date.
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*
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* @description
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* Return the end of an ISO week-numbering year,
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* which always starts 3 days before the year's first Thursday.
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* The result will be in the local timezone.
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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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* @typeParam DateType - The `Date` type, the function operates on. Gets inferred from passed arguments. Allows to use extensions like [`UTCDate`](https://github.com/date-fns/utc).
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*
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* @param date - The original date
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*
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* @returns The end of an ISO week-numbering year
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*
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* @example
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* // The end of an ISO week-numbering year for 2 July 2005:
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* const result = endOfISOWeekYear(new Date(2005, 6, 2))
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* //=> Sun Jan 01 2006 23:59:59.999
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*/
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function endOfISOWeekYear(date) {
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const year = (0, _index.getISOWeekYear)(date);
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const fourthOfJanuaryOfNextYear = (0, _index3.constructFrom)(date, 0);
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fourthOfJanuaryOfNextYear.setFullYear(year + 1, 0, 4);
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fourthOfJanuaryOfNextYear.setHours(0, 0, 0, 0);
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const _date = (0, _index2.startOfISOWeek)(fourthOfJanuaryOfNextYear);
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_date.setMilliseconds(_date.getMilliseconds() - 1);
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return _date;
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}
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