DMleadgen
46d973904b
Next.js website for Rocky Mountain Vending company featuring: - Product catalog with Stripe integration - Service areas and parts pages - Admin dashboard with Clerk authentication - SEO optimized pages with JSON-LD structured data Co-authored-by: Cursor <cursoragent@cursor.com>
53 lines
1.6 KiB
Text
53 lines
1.6 KiB
Text
import { constructFrom } from "./constructFrom.js";
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import { startOfISOWeek } from "./startOfISOWeek.js";
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import { toDate } from "./toDate.js";
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/**
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* The {@link getISOWeekYear} function options.
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*/
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/**
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* @name getISOWeekYear
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* @category ISO Week-Numbering Year Helpers
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* @summary Get the ISO week-numbering year of the given date.
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*
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* @description
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* Get the ISO week-numbering year of the given date,
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* which always starts 3 days before the year's first Thursday.
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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 date - The given date
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*
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* @returns The ISO week-numbering year
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*
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* @example
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* // Which ISO-week numbering year is 2 January 2005?
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* const result = getISOWeekYear(new Date(2005, 0, 2))
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* //=> 2004
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*/
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export function getISOWeekYear(date, options) {
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const _date = toDate(date, options?.in);
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const year = _date.getFullYear();
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const fourthOfJanuaryOfNextYear = 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 startOfNextYear = startOfISOWeek(fourthOfJanuaryOfNextYear);
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const fourthOfJanuaryOfThisYear = constructFrom(_date, 0);
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fourthOfJanuaryOfThisYear.setFullYear(year, 0, 4);
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fourthOfJanuaryOfThisYear.setHours(0, 0, 0, 0);
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const startOfThisYear = startOfISOWeek(fourthOfJanuaryOfThisYear);
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if (_date.getTime() >= startOfNextYear.getTime()) {
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return year + 1;
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} else if (_date.getTime() >= startOfThisYear.getTime()) {
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return year;
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} else {
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return year - 1;
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}
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}
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// Fallback for modularized imports:
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export default getISOWeekYear;
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