OK I have two cells (different than last posting) that have times listed in there as shown below.

:20:30
and
:30:40

I want to get the difference between these two cells to show in a third area so I can see lets say -:10:10 like D2-D1. I try to do this now but get the #Value! Error. And no Formatting cells helps. How would I go about this?

TIA.
Jimmy