Excel - Subtract a number of days from a date

Put this formula this in any cell (except A1):

=DATE(YEAR(A1), MONTH(A1), DAY(A1)-35)

Assumes your date is in Cell A1

or

=DATE(YEAR(A1), MONTH(A1), DAY(A1)-(A2))

Where your date is in Cell A1 and number of days is in Cell A2