hi
i am trying to make following formula detail is A_col has today date B_col
has some older dates i need result in C_col, if B_col date older than 90 days
of A_col

A_col B_col C_col
07/01/2006 02/01/2006 3 Month is over !
07/01/2006 05/25/2006 -

thanks in advance.
tufail