can i overload a function

[Kshitij]

hi

can i overload a function that already exists in mysql ?

i need to overload the datediff function of mysql.
the datediff function takes 2 date values as arguments and returns the difference in no. of days.
i need to overload it so that it takes 3 arguments, the extra argument being an interval argument (month/year/minutes..). The interval argument determines the return format of the difference in the 2 dates.

please note that the timestampdiff() function would satisfy my requirements but i need the datediff function to perform the same operation.

any help would be appreciated.

thanks

kshitij