Troubleshoot:Calculate difference in hours in form field. Error

Calculate difference in hours in form field.

I am trying to calculate hours worked in a form field.
 The formula works fine if hours before noon.
 If, however, the second field is after noon, e.g.
17:00, it gives a crazy number, such as -43.00.
 

Field one (TimeFrom) 
Type: Date Format:  I have tried both HH:mm and h:mm am/pm 
Enable fill-in is checked Calculate on exit is checked  

Field two (TimeTo) same as above  

Field three (TotalHours) 
Type:  calculation Format:  0:00 
Expression:  I have tried everything I can think of: 
=TimeTo-TimeFrom 
=sum(TimeTo,TimeFrom) 
=sum(TimeTo,-TimeFrom) 

 As I said, if TimeFrom is before noon and TimeTo is before noon, it calculates perfectly.
 However, if TimeTo is after noon, even with military time, it does not work.
 

I have searched and the only thing I can find is for Excel.
 That always works properly, but I do not want to do the form in Excel.
Thanks ahead for anyone who can help

Solutions to the Problem Calculate difference in hours in form field.

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Replace the last line of Doug's version with

ActiveDocument.FormFields("Text3").Result = Str(ElapsedHours) & "." & Format(ElapsedMinutes * 10 / 6, "00")

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