How to calculate time difference in MS Access database

Step 1 Create table as follows

Sno AutoNumber    
startTime DateTime (Format: dd/mm/yyyy hh:nn)    
endTime DateTime (Format: dd/mm/yyyy hh:nn)    
difference Text (Size 15)    

Create query as follows

UPDATE timecalc SET difference = int((DateDiff("n",starttime,endtime)/60)) & "." & (DateDiff("n",starttime,endtime) Mod 60);