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| Viewing file: Select action/file-type: 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);
} |
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