EDATE

The result is a date which is a number of months away from the start date. Only months are considered; days are not used for calculation.

བརྡ་སྤྲོད།

EDATE(Start date;Months)

start_date:ཚེས་གྲངས་ཤིག

Months:ཟླ་བའི་གྲངས།

དཔེ་གཞི།

What date is one month prior to 2001-03-31?

=EDATE("2001-03-31";-1) returns the serial number 36950. Formatted as a date, this is 2001-02-28.