Sunday, May 1, 2016

Excel formula to find overlapping dates in columns

Query: I have a range of dates, start date and end date in a single row in below format.

I want to check for overlap for in each row using formula .


An overlap exists if any of end date is equal to or lesser than start date for other blocks or any of  start date is equal to or greater than end date for other blocks.

We will compare each end date for criteria 1 & compare each start date criteria 2 as mentioned above using following formula.

=IF(SUMPRODUCT((INDEX((A2:F2)*(MOD(COLUMN(A2:F2),2)<>0),,)<=TRANSPOSE(INDEX((B2:G2)*(MOD(COLUMN(B2:G2),2)=0),,)))*(INDEX((B2:G2)*(MOD(COLUMN(B2:G2),2)=0),,)>=TRANSPOSE(INDEX((A2:F2)*(MOD(COLUMN(A2:F2),2)<>0),,))))>1,"Overlap","No Overlap")

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