bc518174
 王天杨
提交两个项目文件
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"use strict";
exports.getISOWeek = getISOWeek;
var _index = require("./constants.js");
var _index2 = require("./startOfISOWeek.js");
var _index3 = require("./startOfISOWeekYear.js");
var _index4 = require("./toDate.js");
/**
* @name getISOWeek
* @category ISO Week Helpers
* @summary Get the ISO week of the given date.
*
* @description
* Get the ISO week of the given date.
*
* ISO week-numbering year: http://en.wikipedia.org/wiki/ISO_week_date
*
* @typeParam DateType - The `Date` type, the function operates on. Gets inferred from passed arguments. Allows to use extensions like [`UTCDate`](https://github.com/date-fns/utc).
*
* @param date - The given date
*
* @returns The ISO week
*
* @example
* // Which week of the ISO-week numbering year is 2 January 2005?
* const result = getISOWeek(new Date(2005, 0, 2))
* //=> 53
*/
function getISOWeek(date) {
const _date = (0, _index4.toDate)(date);
const diff =
+(0, _index2.startOfISOWeek)(_date) -
+(0, _index3.startOfISOWeekYear)(_date);
// 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 / _index.millisecondsInWeek) + 1;
}
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