Adding hours to time gives a new date

Hello,

Can anyone tell me if there is a FM for following example:

Date = 12.12.2008

Time = 19:00:00

I want to add 8 hours to the "Time". The new date and time then should be 13.12.2008 03:00:00.

I've search the forum for some hours but couldn't find a similar example.

Kind rgds,

Patrick