If your start date (15th April 2005) is in A2 and the first day of the
month you wish to check is in B2
=2+(DAY($A$2+28+CEILING(B2-$A$2,14))20)
e.g. in B2 September 1 2005 (format as "mmm-yyyy" if desired)
the above formula will give 3
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daddylonglegs
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