52 lines
2.1 KiB
JavaScript
52 lines
2.1 KiB
JavaScript
import getTimezoneOffsetInMilliseconds from '../_lib/getTimezoneOffsetInMilliseconds/index.js';
|
|
import startOfDay from '../startOfDay/index.js';
|
|
var MILLISECONDS_IN_DAY = 86400000;
|
|
/**
|
|
* @name differenceInCalendarDays
|
|
* @category Day Helpers
|
|
* @summary Get the number of calendar days between the given dates.
|
|
*
|
|
* @description
|
|
* Get the number of calendar days between the given dates. This means that the times are removed
|
|
* from the dates and then the difference in days is calculated.
|
|
*
|
|
* ### v2.0.0 breaking changes:
|
|
*
|
|
* - [Changes that are common for the whole library](https://github.com/date-fns/date-fns/blob/master/docs/upgradeGuide.md#Common-Changes).
|
|
*
|
|
* @param {Date|Number} dateLeft - the later date
|
|
* @param {Date|Number} dateRight - the earlier date
|
|
* @returns {Number} the number of calendar days
|
|
* @throws {TypeError} 2 arguments required
|
|
*
|
|
* @example
|
|
* // How many calendar days are between
|
|
* // 2 July 2011 23:00:00 and 2 July 2012 00:00:00?
|
|
* var result = differenceInCalendarDays(
|
|
* new Date(2012, 6, 2, 0, 0),
|
|
* new Date(2011, 6, 2, 23, 0)
|
|
* )
|
|
* //=> 366
|
|
* // How many calendar days are between
|
|
* // 2 July 2011 23:59:00 and 3 July 2011 00:01:00?
|
|
* var result = differenceInCalendarDays(
|
|
* new Date(2011, 6, 3, 0, 1),
|
|
* new Date(2011, 6, 2, 23, 59)
|
|
* )
|
|
* //=> 1
|
|
*/
|
|
|
|
export default function differenceInCalendarDays(dirtyDateLeft, dirtyDateRight) {
|
|
if (arguments.length < 2) {
|
|
throw new TypeError('2 arguments required, but only ' + arguments.length + ' present');
|
|
}
|
|
|
|
var startOfDayLeft = startOfDay(dirtyDateLeft);
|
|
var startOfDayRight = startOfDay(dirtyDateRight);
|
|
var timestampLeft = startOfDayLeft.getTime() - getTimezoneOffsetInMilliseconds(startOfDayLeft);
|
|
var timestampRight = startOfDayRight.getTime() - getTimezoneOffsetInMilliseconds(startOfDayRight); // Round the number of days to the nearest integer
|
|
// because the number of milliseconds in a day is not constant
|
|
// (e.g. it's different in the day of the daylight saving time clock shift)
|
|
|
|
return Math.round((timestampLeft - timestampRight) / MILLISECONDS_IN_DAY);
|
|
} |