=date(year(a1),month(a1)+1,0)

--

HTH

RP

"Steve F." <Steve wrote in message
...
Is there a formula I can use that can return the last day of the month
from a
date entered in another cell? It needs to work for all months, regardless
of
length of month.

Ex.: 11/12/2004 is entered in A1. I want B1 to return 11/30/2004.