One way that would give you the last day of the quarter:

=A1+92-DAY(A1+92)

--
HTH

Sandy
In Perth, the ancient capital of Scotland


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"emiller" wrote in message
...
I have a date in column A. I want to set up quarterly windows using this
date. What is the formula for adding 3 months to date? I can get the
ending
date by subtracting a day from the beginning of the next quarter date.