Please help!!!!!

I 've a function datemanipulation() and iam passing a date say "passdate" i am using year() day() and month() functions to get the corresponding values , i am doing some calculations year value . According to calcutations the year value will increase or decrease

i 've to return the date in which ever format i've got it , thatis if passdate(parameter) is dd/yyyy/mm then i've to return in that same format??

thanking you in advance

regards
Rahd.