bc518174
 王天杨
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"use strict";
exports.differenceInCalendarISOWeeks = differenceInCalendarISOWeeks;
var _index = require("./constants.js");
var _index2 = require("./startOfISOWeek.js");
var _index3 = require("./_lib/getTimezoneOffsetInMilliseconds.js");
/**
* @name differenceInCalendarISOWeeks
* @category ISO Week Helpers
* @summary Get the number of calendar ISO weeks between the given dates.
*
* @description
* Get the number of calendar ISO weeks between the given dates.
*
* 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 dateLeft - The later date
* @param dateRight - The earlier date
*
* @returns The number of calendar ISO weeks
*
* @example
* // How many calendar ISO weeks are between 6 July 2014 and 21 July 2014?
* const result = differenceInCalendarISOWeeks(
* new Date(2014, 6, 21),
* new Date(2014, 6, 6)
* )
* //=> 3
*/
function differenceInCalendarISOWeeks(dateLeft, dateRight) {
const startOfISOWeekLeft = (0, _index2.startOfISOWeek)(dateLeft);
const startOfISOWeekRight = (0, _index2.startOfISOWeek)(dateRight);
const timestampLeft =
+startOfISOWeekLeft -
(0, _index3.getTimezoneOffsetInMilliseconds)(startOfISOWeekLeft);
const timestampRight =
+startOfISOWeekRight -
(0, _index3.getTimezoneOffsetInMilliseconds)(startOfISOWeekRight);
// 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(
(timestampLeft - timestampRight) / _index.millisecondsInWeek,
);
}
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