If your dates are in column A this formula, say in cell C1, will give
you the number joining within the last 90 days
=COUNTIF(A:A,""&TODAY()-91)
then this formula for the next 90 days
=COUNTIF(A:A,""&TODAY()-181)-C1
then for the rest
=COUNTIF(A:A,"<"&TODAY()-180)
--
daddylonglegs
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