calc for wrapping time around midnight?

[E. Riley Casey]

I am using FMP4 and need to add a time clock capability to our 
database system.  We routinely have people working past midnight into 
the next day as a continuous  work day.   I have seen a nicely done 
example file in FMP7  that returns a  continuous block of hours when 
ever the end time is less than the start time but it appears to 
depend on a function that is not available in FMP4.  Can anyone 
suggest a way to calculate a field that would return the total hours 
worked from say 4 pm on one day until 3 am on the next morning 
without having to have separate records for each day?

Thanks
--
E. Riley Casey
Silver Spring MD
301-608-2180 ph
301-608-0789 fx
301-440-2923 shoe phone
Entertainment Sound Production ( http://www.ESPsound.com )