63 lines
2.3 KiB
JavaScript
63 lines
2.3 KiB
JavaScript
var parse = require('../parse/index.js')
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var MILLISECONDS_IN_DAY = 24 * 60 * 60 * 1000
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/**
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* @category Range Helpers
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* @summary Get the number of days that overlap in two date ranges
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*
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* @description
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* Get the number of days that overlap in two date ranges
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*
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* @param {Date|String|Number} initialRangeStartDate - the start of the initial range
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* @param {Date|String|Number} initialRangeEndDate - the end of the initial range
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* @param {Date|String|Number} comparedRangeStartDate - the start of the range to compare it with
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* @param {Date|String|Number} comparedRangeEndDate - the end of the range to compare it with
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* @returns {Number} the number of days that overlap in two date ranges
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* @throws {Error} startDate of a date range cannot be after its endDate
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*
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* @example
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* // For overlapping date ranges adds 1 for each started overlapping day:
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* getOverlappingDaysInRanges(
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* new Date(2014, 0, 10), new Date(2014, 0, 20), new Date(2014, 0, 17), new Date(2014, 0, 21)
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* )
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* //=> 3
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*
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* @example
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* // For non-overlapping date ranges returns 0:
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* getOverlappingDaysInRanges(
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* new Date(2014, 0, 10), new Date(2014, 0, 20), new Date(2014, 0, 21), new Date(2014, 0, 22)
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* )
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* //=> 0
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*/
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function getOverlappingDaysInRanges (dirtyInitialRangeStartDate, dirtyInitialRangeEndDate, dirtyComparedRangeStartDate, dirtyComparedRangeEndDate) {
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var initialStartTime = parse(dirtyInitialRangeStartDate).getTime()
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var initialEndTime = parse(dirtyInitialRangeEndDate).getTime()
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var comparedStartTime = parse(dirtyComparedRangeStartDate).getTime()
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var comparedEndTime = parse(dirtyComparedRangeEndDate).getTime()
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if (initialStartTime > initialEndTime || comparedStartTime > comparedEndTime) {
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throw new Error('The start of the range cannot be after the end of the range')
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}
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var isOverlapping = initialStartTime < comparedEndTime && comparedStartTime < initialEndTime
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if (!isOverlapping) {
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return 0
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}
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var overlapStartDate = comparedStartTime < initialStartTime
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? initialStartTime
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: comparedStartTime
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var overlapEndDate = comparedEndTime > initialEndTime
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? initialEndTime
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: comparedEndTime
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var differenceInMs = overlapEndDate - overlapStartDate
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return Math.ceil(differenceInMs / MILLISECONDS_IN_DAY)
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}
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module.exports = getOverlappingDaysInRanges
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