EOMONTH (start_date,months)
@months @start_date.
#NUM!, @start_date @months .
Excel.
A1 12/21/00, EOMONTH(A1,0)=12/31/00, EOMONTH(A1,5)=5/31/01, EOMONTH(A1,2)=2/28/01
MONTH.