About add parameter

Hi

Is there any suggestion about  below?

Requirement:

Display the program run time in the report .

In order to meet the requirement, I added a parameter 'p_run_time' from define window.

The value set is 'FND_STANDARD_DATE  and selected  'current date'.

Then , I added below formula to capture the  value of _p_run_time and want to display in the xml data.

function CF_RUN_DATEFormula return Char is

v_run_date varchar2(200);

begin

v_run_date := trunc(apps.fnd_date.canonical_to_date(:P_Current_date)) ;

return v_run_date;

exception

when others then

v_run_date := NULL;