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Hi Hylton.
There is an ISBLANK() function that will test if the cell is blank. Safer might be to test IF UPPER($Data.F$3:F$1000)  NOT "Y" Check the help on SUMFS also for multiple test criteria as you could test for ISBLANK(), is not "y", is not "Y"

Is there a reason you are not entering the dates as a date rather than a number.


On 28/09/2018 03:24, Hylton Conacher (ZR1HPC) wrote:
I am using the formula of


This formula works but I would like to have a blank field i.e. "" instead of "N".

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