Crystal Reports Time totals

I am trying to calculate totals hours worked in my report.  The fields that I am originally using are a string and I converted to time field by using the ctime formula.  So for my formula I was trying to use the datediff function and when I do an error checking it errors out and says I need the field to be a datetime or time field.  I also a changed the field format to a 24 hour clock.

This is what I want to accomplish   EndTime (ex.16:00) - StartTime (ex 08:00) = total hours worked (ex 8:00)
This is driving me crazy for something simple in theory has to  be so frustrating implementing it.

Any help is appreciated
Brian SchraederI.T.Asked:
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Ido MilletProfessor of MIS at Penn State Erie and Owner, Millet SoftwareCommented:
You probably need to use the cDateTime() function to convert your field to DateTime.  
See Online help on this function.
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Brian SchraederI.T.Author Commented:
Thank you so much I feel so stupid.....
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