给定两个日期范围,确定两个日期是否重叠的最简单或最有效的方法是什么?
例如,假设我们有由DateTime变量StartDate1到EndDate1和StartDate2到EndDate2表示的范围。
给定两个日期范围,确定两个日期是否重叠的最简单或最有效的方法是什么?
例如,假设我们有由DateTime变量StartDate1到EndDate1和StartDate2到EndDate2表示的范围。
当前回答
在Microsoft SQL SERVER中-SQL函数
CREATE FUNCTION IsOverlapDates
(
@startDate1 as datetime,
@endDate1 as datetime,
@startDate2 as datetime,
@endDate2 as datetime
)
RETURNS int
AS
BEGIN
DECLARE @Overlap as int
SET @Overlap = (SELECT CASE WHEN (
(@startDate1 BETWEEN @startDate2 AND @endDate2) -- caters for inner and end date outer
OR
(@endDate1 BETWEEN @startDate2 AND @endDate2) -- caters for inner and start date outer
OR
(@startDate2 BETWEEN @startDate1 AND @endDate1) -- only one needed for outer range where dates are inside.
) THEN 1 ELSE 0 END
)
RETURN @Overlap
END
GO
--Execution of the above code
DECLARE @startDate1 as datetime
DECLARE @endDate1 as datetime
DECLARE @startDate2 as datetime
DECLARE @endDate2 as datetime
DECLARE @Overlap as int
SET @startDate1 = '2014-06-01 01:00:00'
SET @endDate1 = '2014-06-01 02:00:00'
SET @startDate2 = '2014-06-01 01:00:00'
SET @endDate2 = '2014-06-01 01:30:00'
SET @Overlap = [dbo].[IsOverlapDates] (@startDate1, @endDate1, @startDate2, @endDate2)
SELECT Overlap = @Overlap
其他回答
使用Java util.Date,这里是我所做的。
public static boolean checkTimeOverlaps(Date startDate1, Date endDate1, Date startDate2, Date endDate2)
{
if (startDate1 == null || endDate1 == null || startDate2 == null || endDate2 == null)
return false;
if ((startDate1.getTime() <= endDate2.getTime()) && (startDate2.getTime() <= endDate1.getTime()))
return true;
return false;
}
使用momentjs的简短回答:
function isOverlapping(startDate1, endDate1, startDate2, endDate2){
return moment(startDate1).isSameOrBefore(endDate2) &&
moment(startDate2).isSameOrBefore(endDate1);
}
答案基于上述答案,但缩短了。
我认为最简单的方法是比较EndDate1是否在StartDate2之前,EndDate2是否在StartDate 1之前。
当然,如果您正在考虑StartDate总是在EndDate之前的时间间隔。
if (StartDate1 > StartDate2) swap(StartDate, EndDate);
(StartDate1 <= EndDate2) and (StartDate2 <= EndDate1);
这是一段神奇的代码:
var isOverlapping = ((A == null || D == null || A <= D)
&& (C == null || B == null || C <= B)
&& (A == null || B == null || A <= B)
&& (C == null || D == null || C <= D));
哪里
A->1启动B->1结束C->2启动D->2结束
证据查看此测试控制台代码要点。