[Skunkworks] KINDLY HELP:How to combine three columns and form a date and update

Hi skunkworks, kindly help me i have a table with these columns ( month int null, year int not null, acct_no char(15) not null, acct_type char(10) not null, effective_dt datetime null, late_fee_to_dt) the field effective_dt is null and i want it to be populate by a value which d=should be composed of '29' then the respective value of column month and respective value of column year, kindly help me do a script to update the effective_dt. will appreciate your assistance -- Best regards Esther Wambugu