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date-fns

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Modern JavaScript date utility library

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import toDate from '../../toDate/index.js'; // This function will be a part of public API when UTC function will be implemented. // See issue: https://github.com/date-fns/date-fns/issues/376 export default function startOfUTCISOWeek(dirtyDate) { if (arguments.length < 1) { throw new TypeError('1 argument required, but only ' + arguments.length + ' present'); } var weekStartsOn = 1; var date = toDate(dirtyDate); var day = date.getUTCDay(); var diff = (day < weekStartsOn ? 7 : 0) + day - weekStartsOn; date.setUTCDate(date.getUTCDate() - diff); date.setUTCHours(0, 0, 0, 0); return date; }