64 lines
2.1 KiB
JavaScript
64 lines
2.1 KiB
JavaScript
|
import { getTimezoneOffsetInMilliseconds } from "./_lib/getTimezoneOffsetInMilliseconds.js";
|
||
|
|
import { normalizeDates } from "./_lib/normalizeDates.js";
|
||
|
|
import { millisecondsInDay } from "./constants.js";
|
||
|
|
import { startOfDay } from "./startOfDay.js";
|
||
|
|
|
||
|
|
/**
|
||
|
|
* The {@link differenceInCalendarDays} function options.
|
||
|
|
*/
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @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.
|
||
|
|
*
|
||
|
|
* @param laterDate - The later date
|
||
|
|
* @param earlierDate - The earlier date
|
||
|
|
* @param options - The options object
|
||
|
|
*
|
||
|
|
* @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
|
||
|
|
*/
|
||
|
|
export function differenceInCalendarDays(laterDate, earlierDate, options) {
|
||
|
|
const [laterDate_, earlierDate_] = normalizeDates(
|
||
|
|
options?.in,
|
||
|
|
laterDate,
|
||
|
|
earlierDate,
|
||
|
|
);
|
||
|
|
|
||
|
|
const laterStartOfDay = startOfDay(laterDate_);
|
||
|
|
const earlierStartOfDay = startOfDay(earlierDate_);
|
||
|
|
|
||
|
|
const laterTimestamp =
|
||
|
|
+laterStartOfDay - getTimezoneOffsetInMilliseconds(laterStartOfDay);
|
||
|
|
const earlierTimestamp =
|
||
|
|
+earlierStartOfDay - getTimezoneOffsetInMilliseconds(earlierStartOfDay);
|
||
|
|
|
||
|
|
// 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((laterTimestamp - earlierTimestamp) / millisecondsInDay);
|
||
|
|
}
|
||
|
|
|
||
|
|
// Fallback for modularized imports:
|
||
|
|
export default differenceInCalendarDays;
|