Hi,

I am using this formula:
AND(T$4=DATE(YEAR($AR5),MONTH($AR5),1),T
$4<=DATE(YEAR($AS5),MONTH($AS5)+1,0))

(the logic is that first cell is fist half of month and the other
second half):

01/03/2007(cell: T4) 16/03/2007(Cell: T5)

They are both returning true with

AR5 = 16/03/2007
AS5 = 30/03/2007

What I would like is to have cell T4 to return false and T5 to be
true. This is because AR5 is above the 15th of March.

My sheet has the 12 months split this way, the above is an example.

Any ideas?

Thanks in advance.