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
本文《.NET时间段库》通过枚举PeriodRelation描述了两个时间段之间的关系:
// ------------------------------------------------------------------------
public enum PeriodRelation
{
After,
StartTouching,
StartInside,
InsideStartTouching,
EnclosingStartTouching,
Enclosing,
EnclosingEndTouching,
ExactMatch,
Inside,
InsideEndTouching,
EndInside,
EndTouching,
Before,
} // enum PeriodRelation
其他回答
如果重叠本身也需要计算,可以使用以下公式:
overlap = max(0, min(EndDate1, EndDate2) - max(StartDate1, StartDate2))
if (overlap > 0) {
...
}
本文《.NET时间段库》通过枚举PeriodRelation描述了两个时间段之间的关系:
// ------------------------------------------------------------------------
public enum PeriodRelation
{
After,
StartTouching,
StartInside,
InsideStartTouching,
EnclosingStartTouching,
Enclosing,
EnclosingEndTouching,
ExactMatch,
Inside,
InsideEndTouching,
EndInside,
EndTouching,
Before,
} // enum PeriodRelation
你可以试试这个:
//custom date for example
$d1 = new DateTime("2012-07-08");
$d2 = new DateTime("2012-07-11");
$d3 = new DateTime("2012-07-08");
$d4 = new DateTime("2012-07-15");
//create a date period object
$interval = new DateInterval('P1D');
$daterange = iterator_to_array(new DatePeriod($d1, $interval, $d2));
$daterange1 = iterator_to_array(new DatePeriod($d3, $interval, $d4));
array_map(function($v) use ($daterange1) { if(in_array($v, $daterange1)) print "Bingo!";}, $daterange);
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
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;
}