34 lines
853 B
JavaScript
34 lines
853 B
JavaScript
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import toDate from "../toDate/index.js";
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import requiredArgs from "../_lib/requiredArgs/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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* @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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* const 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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requiredArgs(1, arguments);
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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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