Here you go,
Numbervar datediff;
Numbervar days;
Numbervar Hrs;
Numbervar hours;
Numbervar Mins;
Numbervar Mns;
StringVar var;
datediff := ({@begin date}) - ({@end_date}); // Result in days
days := (Truncate(datediff));
hrs := (Datediff - days) * 24; //Convert Remaining to hours
Hours := (Truncate(hrs));
Mins := (hrs - hours) * 60; //Convert Remaining to minutes
Mns := (Truncate(Mins,0));
var := Totext(Abs(days), 0) + " " + Totext(Abs(hours),0) + ":" + Totext(Abs(Mns),0) ;
This is how I calculate in ver 7.x There could be a easier way in 9.0 which I am not much familiar with.
Hope this helps.
Good-Luck