95 lines
3.6 KiB
JavaScript
95 lines
3.6 KiB
JavaScript
import toDate from '../toDate/index.js';
|
|
var MILLISECONDS_IN_DAY = 24 * 60 * 60 * 1000;
|
|
/**
|
|
* @name getOverlappingDaysInIntervals
|
|
* @category Interval Helpers
|
|
* @summary Get the number of days that overlap in two time intervals
|
|
*
|
|
* @description
|
|
* Get the number of days that overlap in two time intervals
|
|
*
|
|
* ### 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).
|
|
*
|
|
* - The function was renamed from `getOverlappingDaysInRanges` to `getOverlappingDaysInIntervals`.
|
|
* This change was made to mirror the use of the word "interval" in standard ISO 8601:2004 terminology:
|
|
*
|
|
* ```
|
|
* 2.1.3
|
|
* time interval
|
|
* part of the time axis limited by two instants
|
|
* ```
|
|
*
|
|
* Also, this function now accepts an object with `start` and `end` properties
|
|
* instead of two arguments as an interval.
|
|
* This function now throws `RangeError` if the start of the interval is after its end
|
|
* or if any date in the interval is `Invalid Date`.
|
|
*
|
|
* ```javascript
|
|
* // Before v2.0.0
|
|
*
|
|
* getOverlappingDaysInRanges(
|
|
* new Date(2014, 0, 10), new Date(2014, 0, 20),
|
|
* new Date(2014, 0, 17), new Date(2014, 0, 21)
|
|
* )
|
|
*
|
|
* // v2.0.0 onward
|
|
*
|
|
* getOverlappingDaysInIntervals(
|
|
* { start: new Date(2014, 0, 10), end: new Date(2014, 0, 20) },
|
|
* { start: new Date(2014, 0, 17), end: new Date(2014, 0, 21) }
|
|
* )
|
|
* ```
|
|
*
|
|
* @param {Interval} intervalLeft - the first interval to compare. See [Interval]{@link docs/Interval}
|
|
* @param {Interval} intervalRight - the second interval to compare. See [Interval]{@link docs/Interval}
|
|
* @returns {Number} the number of days that overlap in two time intervals
|
|
* @throws {TypeError} 2 arguments required
|
|
* @throws {RangeError} The start of an interval cannot be after its end
|
|
* @throws {RangeError} Date in interval cannot be `Invalid Date`
|
|
*
|
|
* @example
|
|
* // For overlapping time intervals adds 1 for each started overlapping day:
|
|
* getOverlappingDaysInIntervals(
|
|
* { start: new Date(2014, 0, 10), end: new Date(2014, 0, 20) },
|
|
* { start: new Date(2014, 0, 17), end: new Date(2014, 0, 21) }
|
|
* )
|
|
* //=> 3
|
|
*
|
|
* @example
|
|
* // For non-overlapping time intervals returns 0:
|
|
* getOverlappingDaysInIntervals(
|
|
* { start: new Date(2014, 0, 10), end: new Date(2014, 0, 20) },
|
|
* { start: new Date(2014, 0, 21), end: new Date(2014, 0, 22) }
|
|
* )
|
|
* //=> 0
|
|
*/
|
|
|
|
export default function getOverlappingDaysInIntervals(dirtyIntervalLeft, dirtyIntervalRight) {
|
|
if (arguments.length < 2) {
|
|
throw new TypeError('2 arguments required, but only ' + arguments.length + ' present');
|
|
}
|
|
|
|
var intervalLeft = dirtyIntervalLeft || {};
|
|
var intervalRight = dirtyIntervalRight || {};
|
|
var leftStartTime = toDate(intervalLeft.start).getTime();
|
|
var leftEndTime = toDate(intervalLeft.end).getTime();
|
|
var rightStartTime = toDate(intervalRight.start).getTime();
|
|
var rightEndTime = toDate(intervalRight.end).getTime(); // Throw an exception if start date is after end date or if any date is `Invalid Date`
|
|
|
|
if (!(leftStartTime <= leftEndTime && rightStartTime <= rightEndTime)) {
|
|
throw new RangeError('Invalid interval');
|
|
}
|
|
|
|
var isOverlapping = leftStartTime < rightEndTime && rightStartTime < leftEndTime;
|
|
|
|
if (!isOverlapping) {
|
|
return 0;
|
|
}
|
|
|
|
var overlapStartDate = rightStartTime < leftStartTime ? leftStartTime : rightStartTime;
|
|
var overlapEndDate = rightEndTime > leftEndTime ? leftEndTime : rightEndTime;
|
|
var differenceInMs = overlapEndDate - overlapStartDate;
|
|
return Math.ceil(differenceInMs / MILLISECONDS_IN_DAY);
|
|
} |