Just add 90 to the "Start Date"
In the earlier formula: Add 90 days to C2 and check if the date is first of the month (DAY) check) : if not, calculate the start at the first of the NEXT month- EMONTH(C2+90,0) is end of the month in which the 90 days occur say 24 July, so we find EOMONTH (July) and add 1 (day) to we get 1st August as the start date.
Hope this helps
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