Hello Al.
I was testing the code that you gived me, but it return me a invalid result.
I use this:

class=code
ltDateTime1 = {^2001-06-22 09:00:00}
ltDateTime2 = {^2001-06-23 15:00:00}
lnTimeDifferenceInSeconds = ((ltDateTime2 - ltDateTime1)/3600)

The result that it return me is: 30.0000
The result of this must to be: 6
What do you think is happening.?