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 FT_ELAPMIN()
 Return difference, in minutes, between two mil format times.
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 Syntax

      FT_ELAPMIN( <cTIME1>, <cTIME2> ) -> nMINUTES

 Arguments

     <cTIME1, cTIME2>  character strings of military form "hhmm",
         where 0<=hh<24.

 Returns

     <nMINUTES>

 Description

     Finds the arithmetic difference between time two times
     (time 2 - time 1).
     If time 2 is smaller than time 1, a NEGATIVE value is returned.

 Examples

     FT_ELAPMIN( "1718", "2040" ) ->  322
     FT_ELAPMIN( "2040", "1718" ) -> -322

 Source: ELAPMIL.PRG

 Author: Alexander B. Spencer