Function To Subtract 2 Decimal Times & Return A True Time

Dec 4, 2007

I have created a userdefined function. the Idea is for the user to calculate the difference in hours and minutes. The input would be like budtime = 30 , realtime = 1.25 the answer I would like to have is 28:45 (28hours and 45 mins). Im aware that I can format the cell manually with [h]:mm but I'd like the function to do it.
I have written this:

Function RT(BudTime, RealTime)
RT = Format(((CDec(BudTime) - CDec(RealTime) / 24)), "[h]:mm")
End Function

I'm trying to subtract two times to get the difference. Entries are in military format (1615) and VBA converts the time to 16:15. My problem is that when a time is entered between 0001 and 0059 (i.e. 0015), the VBA converts the time to :15. My formula does not recognize this, but does recognize 0:15 (entered without VBA). The cell is custom formatted as h:mm. I've tried several other formats including [h]:mm but can't get any to work. How can I get a formula to recognize it?

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