Sam - it can most likely be handled on the XPression side of things. If you just need to clean off the leading "0:", you can do something like this on the text object:
'script to clean off leading clock zero
if (left(Text,2) = "0:") then
Text = Right(Text,Len(Text)-2)
end if
This isn't one of my panels, is it? There may be a way to control the output in Dashboard as well. I just haven't done it yet.
-Brian
#DashBoard