Overlapping of two Date Range

Question

Given two date ranges, whether the two date ranges overlap?

As an example, suppose we have ranges denoted by DateTime variables StartDate1 to EndDate1 and StartDate2 to EndDate2.

eg:

(A) StartDate1- 14-08-2014   EndDate1 - 14-08-2015
    StartDate2- 14-08-2012   EndDate2 - 14-08-2013

(B) StartDate1- 14-08-2014   EndDate1 - 14-08-2015
    StartDate2- 14-08-2013   EndDate2 - 14-08-2014

(C) StartDate1- 14-08-2014   EndDate1 - 14-08-2015
    StartDate2- 15-08-2014   EndDate2 - 13-08-2015

(D) StartDate1- 14-08-2014   EndDate1 - 14-08-2015
    StartDate2- 14-08-2015   EndDate2 - 14-08-2016

(E) StartDate1- 14-08-2014   EndDate1 - 14-08-2015
    StartDate2- 15-08-2015   EndDate2 - 15-08-2016

JaskeyLam · Accepted Answer · 2014-08-14T06:16:36.970

-1

Not Overlapped:

Start1 > End2(after) OR End1 < Start2(before)

So overlapped will be NOT (Start1 > End2 OR End1 < Start2)

Please note that in order to use "<" or ">" ,you can use Date.getTime() to get the Date of long.

    SimpleDateFormat sdf = new SimpleDateFormat("dd-MM-yyyy");      
    long Start1 =sdf.parse("14-08-2014").getTime();
    long End1=sdf.parse("14-08-2015").getTime();
    long Start2=sdf.parse("14-08-2012").getTime();
    long End2=sdf.parse("14-08-2013").getTime();
    System.out.println("overlapped :" +!((Start1>End2)||(End1<Start2)));

edited Aug 14 '14 at 06:16

answered Aug 14 '14 at 04:34

JaskeyLam

15,405
21
114
149

can you please explain with example? given above date ranges. – beDev Aug 14 '14 at 04:37
This is only one case, what about the others? further, the requirement was that the ranges will overlap - being inclusive is not required (though it's an option). – Nir Alfasi Aug 14 '14 at 04:42
yes can you please explain for all possibility? – beDev Aug 14 '14 at 04:47
now above example does not include (StartDate1 <= EndDate2) && (StartDate2 <= EndDate1) condition. – beDev Aug 14 '14 at 05:03
@alfasin , can I have a upvote since I updated my answer and op has accepted it – JaskeyLam Nov 10 '14 at 13:15

Overlapping of two Date Range

1 Answers1