Marc Mintel
5397309103
Some checks failed
Build & Deploy / 🔍 Prepare (push) Successful in 20s
Build & Deploy / 🧪 QA (push) Failing after 34s
Build & Deploy / 🏗️ Build (push) Has started running
Build & Deploy / 🚀 Deploy (push) Has been cancelled
Build & Deploy / 🧪 Smoke Test (push) Has been cancelled
Build & Deploy / ⚡ Lighthouse (push) Has been cancelled
Build & Deploy / 🔔 Notify (push) Has been cancelled
42 lines
1.3 KiB
Plaintext
42 lines
1.3 KiB
Plaintext
import { addWeeks } from "./addWeeks.js";
|
|
import { millisecondsInWeek } from "./constants.js";
|
|
import { startOfISOWeekYear } from "./startOfISOWeekYear.js";
|
|
|
|
/**
|
|
* The {@link getISOWeeksInYear} function options.
|
|
*/
|
|
|
|
/**
|
|
* @name getISOWeeksInYear
|
|
* @category ISO Week-Numbering Year Helpers
|
|
* @summary Get the number of weeks in an ISO week-numbering year of the given date.
|
|
*
|
|
* @description
|
|
* Get the number of weeks in an ISO week-numbering year of the given date.
|
|
*
|
|
* ISO week-numbering year: http://en.wikipedia.org/wiki/ISO_week_date
|
|
*
|
|
* @param date - The given date
|
|
* @param options - An object with options
|
|
*
|
|
* @returns The number of ISO weeks in a year
|
|
*
|
|
* @example
|
|
* // How many weeks are in ISO week-numbering year 2015?
|
|
* const result = getISOWeeksInYear(new Date(2015, 1, 11))
|
|
* //=> 53
|
|
*/
|
|
export function getISOWeeksInYear(date, options) {
|
|
const thisYear = startOfISOWeekYear(date, options);
|
|
const nextYear = startOfISOWeekYear(addWeeks(thisYear, 60));
|
|
const diff = +nextYear - +thisYear;
|
|
|
|
// Round the number of weeks to the nearest integer because the number of
|
|
// milliseconds in a week is not constant (e.g. it's different in the week of
|
|
// the daylight saving time clock shift).
|
|
return Math.round(diff / millisecondsInWeek);
|
|
}
|
|
|
|
// Fallback for modularized imports:
|
|
export default getISOWeeksInYear;
|