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

Modern JavaScript date utility library

import toDate from '../../toDate/index.js';
import startOfUTCISOWeek from '../startOfUTCISOWeek/index.js';
import startOfUTCISOWeekYear from '../startOfUTCISOWeekYear/index.js';
var MILLISECONDS_IN_WEEK = 604800000; // 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 getUTCISOWeek(dirtyDate) {
  if (arguments.length < 1) {
    throw new TypeError('1 argument required, but only ' + arguments.length + ' present');
  }

  var date = toDate(dirtyDate);
  var diff = startOfUTCISOWeek(date).getTime() - startOfUTCISOWeekYear(date).getTime(); // Round the number of days to the nearest integer
  // because the number of milliseconds in a week is not constant
  // (e.g. it's different in the week of the daylight saving time clock shift)

  return Math.round(diff / MILLISECONDS_IN_WEEK) + 1;
}