>say i've got yyyy/mm/dd or yy/mm/dd or mm/yy/dd or mm/yyyy/dd
>i 've to do calculations on year part and return the date in the same format as it was given to the function.
Rahd,
More duplication to same question.

function docalculation
lparameters pdDate
lnYear = year(pdDate)
* Your cals here
* lnAddYears = your calc
* Add, subtract year
* return gomonth(pdDate, lnAddYears*12) 
* Add, subtract days
* return pdDate + lnAddDays

You don't need to do any conversion for dateformat.
Cetin