Is there an easy way to do time calucations.

Add/Subtract seconds/minutes/days

For example:
Adding 80 mintues to 05/16/2001 11:11:11 PM would result in
05/17/2001 12:31:11 AM

I have looked around the help file and what I have determined is that each
section (mm/dd/yyyy mm:hh:ss) needs to be calculated separately then bring the individual results together into one string.

That seems like a lot a work to do a pretty simple thing.

Any help would be appreciated.