date-fns/esm/_lib/startOfUTCISOWeek/index.js

Modern JavaScript date utility library

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;
}