Syntax: @EDATE(S, M)
S = Start date
M = Months
@EDATE returns a date/time value representing the date M months after S if M is positive, and M months previous to S if M is negative. The date returned will be on the same day of the month as S.
Examples:
@EDATE(@DATEVALUE(``2/29/92''), 3) = 33753 or 05/29/92
@EDATE(@DATEVALUE(``2/29/92''), 12) = 34028 or 2/28/93
@EDATE(@DATEVALUE(``3/30/93''), -6) = 33877 or 09/30/92