That was actually my first attempt, but it doesn't work.

$time1 = Date_to_Time(2007,1,1,23,00,0);
$time2 = Date_to_Time(2007,1,1,03,00,0);
$time3 = Date_to_Time(2007,1,1,01,00,0);
[download]

1167692400      1167620400      1167613200
1167642000
09:00:00

Actually came up with a way to do this, but, would love to hear other/better suggestions. All of my jobs start at 5pm. So, what I can do is check and see if the start time of a particular job is < 5pm. If so, I know it started the next day, then I would do this:
$time = Date_to_Time(2007,1,2,02,00,0);
If it is after 5pm, then it's the same day so:
$time = Date_to_Time(2007,1,1,23,00,0);