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- import getISOWeekYear from "../getISOWeekYear/index.js";
- import startOfISOWeek from "../startOfISOWeek/index.js";
- import requiredArgs from "../_lib/requiredArgs/index.js";
- /**
- * @name endOfISOWeekYear
- * @category ISO Week-Numbering Year Helpers
- * @summary Return the end of an ISO week-numbering year for the given date.
- *
- * @description
- * Return the end of an ISO week-numbering year,
- * which always starts 3 days before the year's first Thursday.
- * The result will be in the local timezone.
- *
- * ISO week-numbering year: http://en.wikipedia.org/wiki/ISO_week_date
- *
- * @param {Date|Number} date - the original date
- * @returns {Date} the end of an ISO week-numbering year
- * @throws {TypeError} 1 argument required
- *
- * @example
- * // The end of an ISO week-numbering year for 2 July 2005:
- * const result = endOfISOWeekYear(new Date(2005, 6, 2))
- * //=> Sun Jan 01 2006 23:59:59.999
- */
- export default function endOfISOWeekYear(dirtyDate) {
- requiredArgs(1, arguments);
- var year = getISOWeekYear(dirtyDate);
- var fourthOfJanuaryOfNextYear = new Date(0);
- fourthOfJanuaryOfNextYear.setFullYear(year + 1, 0, 4);
- fourthOfJanuaryOfNextYear.setHours(0, 0, 0, 0);
- var date = startOfISOWeek(fourthOfJanuaryOfNextYear);
- date.setMilliseconds(date.getMilliseconds() - 1);
- return date;
- }
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