57 lines
2.0 KiB
JavaScript
57 lines
2.0 KiB
JavaScript
|
"use strict";
|
||
|
exports.differenceInCalendarDays = differenceInCalendarDays;
|
||
|
var _index = require("./constants.js");
|
||
|
var _index2 = require("./startOfDay.js");
|
||
|
var _index3 = require("./_lib/getTimezoneOffsetInMilliseconds.js");
|
||
|
|
||
|
/**
|
||
|
* @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.
|
||
|
*
|
||
|
* @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 days
|
||
|
*
|
||
|
* @example
|
||
|
* // How many calendar days are between
|
||
|
* // 2 July 2011 23:00:00 and 2 July 2012 00:00:00?
|
||
|
* const 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?
|
||
|
* const result = differenceInCalendarDays(
|
||
|
* new Date(2011, 6, 3, 0, 1),
|
||
|
* new Date(2011, 6, 2, 23, 59)
|
||
|
* )
|
||
|
* //=> 1
|
||
|
*/
|
||
|
function differenceInCalendarDays(dateLeft, dateRight) {
|
||
|
const startOfDayLeft = (0, _index2.startOfDay)(dateLeft);
|
||
|
const startOfDayRight = (0, _index2.startOfDay)(dateRight);
|
||
|
|
||
|
const timestampLeft =
|
||
|
+startOfDayLeft -
|
||
|
(0, _index3.getTimezoneOffsetInMilliseconds)(startOfDayLeft);
|
||
|
const timestampRight =
|
||
|
+startOfDayRight -
|
||
|
(0, _index3.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 week of
|
||
|
// the daylight saving time clock shift).
|
||
|
return Math.round(
|
||
|
(timestampLeft - timestampRight) / _index.millisecondsInDay,
|
||
|
);
|
||
|
}
|