40 lines
1.0 KiB
JavaScript
40 lines
1.0 KiB
JavaScript
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import toDate from '../toDate/index.js';
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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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* ### v2.0.0 breaking changes:
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*
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* - [Changes that are common for the whole library](https://github.com/date-fns/date-fns/blob/master/docs/upgradeGuide.md#Common-Changes).
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*
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* @param {Date|Number} date - the given date
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* @returns {Number} the day of ISO week
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* @throws {TypeError} 1 argument required
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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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* var result = getISODay(new Date(2012, 1, 26))
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* //=> 7
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*/
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export default function getISODay(dirtyDate) {
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if (arguments.length < 1) {
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throw new TypeError('1 argument required, but only ' + arguments.length + ' present');
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}
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var date = toDate(dirtyDate);
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var 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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