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Viewing file:     index.js (1.3 KB)      -rw-r--r--

import startOfISOWeekYear from "../startOfISOWeekYear/index.js";
import addWeeks from "../addWeeks/index.js";
import requiredArgs from "../_lib/requiredArgs/index.js";
var MILLISECONDS_IN_WEEK = 604800000;
/**
 * @name getISOWeeksInYear
 * @category ISO Week-Numbering Year Helpers
 * @summary Get the number of weeks in an ISO week-numbering year of the given date.
 *
 * @description
 * Get the number of weeks in an ISO week-numbering year of the given date.
 *
 * ISO week-numbering year: http://en.wikipedia.org/wiki/ISO_week_date
 *
 * @param {Date|Number} date - the given date
 * @returns {Number} the number of ISO weeks in a year
 * @throws {TypeError} 1 argument required
 *
 * @example
 * // How many weeks are in ISO week-numbering year 2015?
 * const result = getISOWeeksInYear(new Date(2015, 1, 11))
 * //=> 53
 */

export default function getISOWeeksInYear(dirtyDate) {
  requiredArgs(1, arguments);
  var thisYear = startOfISOWeekYear(dirtyDate);
  var nextYear = startOfISOWeekYear(addWeeks(thisYear, 60));
  var diff = nextYear.valueOf() - thisYear.valueOf(); // Round the number of weeks 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);
}