40 lines
1.4 KiB
JavaScript
40 lines
1.4 KiB
JavaScript
import { getISOWeekYear } from "./getISOWeekYear.mjs";
|
|
import { startOfISOWeek } from "./startOfISOWeek.mjs";
|
|
import { constructFrom } from "./constructFrom.mjs";
|
|
|
|
/**
|
|
* @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
|
|
*
|
|
* @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).
|
|
*
|
|
* @param date - The original date
|
|
*
|
|
* @returns The end of an ISO week-numbering year
|
|
*
|
|
* @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 function endOfISOWeekYear(date) {
|
|
const year = getISOWeekYear(date);
|
|
const fourthOfJanuaryOfNextYear = constructFrom(date, 0);
|
|
fourthOfJanuaryOfNextYear.setFullYear(year + 1, 0, 4);
|
|
fourthOfJanuaryOfNextYear.setHours(0, 0, 0, 0);
|
|
const _date = startOfISOWeek(fourthOfJanuaryOfNextYear);
|
|
_date.setMilliseconds(_date.getMilliseconds() - 1);
|
|
return _date;
|
|
}
|
|
|
|
// Fallback for modularized imports:
|
|
export default endOfISOWeekYear;
|