Duration Calculation

[abTech]

 I have table that contains this tow columns i want to calculate the duration time in a new column the both column are timestamp data type 

[snibrahim1993]

Try this @abTech 
Interval( Timestamp#(EndDate, 'MM-DD-YY hh:mm TT') - Timestamp#(StartDate, 'MM-DD-YY hh:mm TT'), 'hh:mm' )