Using the function DateAdd will do the work, but the function only do one type of calculation at a time, so you can either convert the hours to minutes make a total add up, or use one DateAdd for hours, one for minutes.
- Dim LDate As Date
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LDate = DateAdd ("n", 495, Time())
"n" represent minutes, and 495 is adding 495 minutes (8hrs and 15mins) to Time(). But use Now() instead if you are adding time that pass 12 AM to another day.