Marc Mintel
5397309103
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50 lines
1.8 KiB
Plaintext
50 lines
1.8 KiB
Plaintext
"use strict";
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exports.setISOWeekYear = setISOWeekYear;
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var _index = require("./constructFrom.cjs");
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var _index2 = require("./differenceInCalendarDays.cjs");
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var _index3 = require("./startOfISOWeekYear.cjs");
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var _index4 = require("./toDate.cjs");
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/**
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* The {@link setISOWeekYear} function options.
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*/
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/**
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* @name setISOWeekYear
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* @category ISO Week-Numbering Year Helpers
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* @summary Set the ISO week-numbering year to the given date.
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*
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* @description
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* Set the ISO week-numbering year to the given date,
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* saving the week number and the weekday number.
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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 using extensions like [`UTCDate`](https://github.com/date-fns/utc).
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* @typeParam ResultDate - The result `Date` type, it is the type returned from the context function if it is passed, or inferred from the arguments.
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*
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* @param date - The date to be changed
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* @param weekYear - The ISO week-numbering year of the new date
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* @param options - An object with options
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*
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* @returns The new date with the ISO week-numbering year set
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*
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* @example
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* // Set ISO week-numbering year 2007 to 29 December 2008:
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* const result = setISOWeekYear(new Date(2008, 11, 29), 2007)
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* //=> Mon Jan 01 2007 00:00:00
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*/
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function setISOWeekYear(date, weekYear, options) {
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let _date = (0, _index4.toDate)(date, options?.in);
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const diff = (0, _index2.differenceInCalendarDays)(
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_date,
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(0, _index3.startOfISOWeekYear)(_date, options),
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);
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const fourthOfJanuary = (0, _index.constructFrom)(options?.in || date, 0);
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fourthOfJanuary.setFullYear(weekYear, 0, 4);
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fourthOfJanuary.setHours(0, 0, 0, 0);
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_date = (0, _index3.startOfISOWeekYear)(fourthOfJanuary);
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_date.setDate(_date.getDate() + diff);
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return _date;
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}
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