38 lines
935 B
JavaScript
38 lines
935 B
JavaScript
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import { toDate } from "./toDate.mjs";
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/**
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* @name getISODay
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* @category Weekday Helpers
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* @summary Get the day of the ISO week of the given date.
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*
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* @description
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* Get the day of the ISO week of the given date,
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* which is 7 for Sunday, 1 for Monday etc.
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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 to use extensions like [`UTCDate`](https://github.com/date-fns/utc).
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*
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* @param date - The given date
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*
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* @returns The day of ISO week
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*
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* @example
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* // Which day of the ISO week is 26 February 2012?
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* const result = getISODay(new Date(2012, 1, 26))
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* //=> 7
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*/
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export function getISODay(date) {
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const _date = toDate(date);
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let day = _date.getDay();
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if (day === 0) {
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day = 7;
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}
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return day;
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}
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// Fallback for modularized imports:
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export default getISODay;
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