Computation on Time in QlikView

[#1]

Could anyone tell me how to find the difference of two time expression? I was trying to find subtract a time expression from another time expression, so that the resulting value is in minutes. Could anyone help me with this. The two time fields are as follows:

=Time(TIme#(Num(WORK_END_TIME,'0000'),'hhmm'),'hh:mm')

=Time(TIme#(Num(WORK_START_TIME,'0000'),'hhmm'),'hh:mm')

How do I get the time difference\ minutes from these time strings.

[Gysbert_Wassenaar]

Subtract them and use the interval function to show the result in minutes: Interval( Time1 - Time2, 'm')