title: calculate difference between two time in hour
body: <p>I want to calculate difference between two time in hours using <code>django</code> in <code>sql db</code> the time are stored in timefield.</p>
  
  <p>I tried this: </p>
  
  <pre><code>def DesigInfo(request):  # attendance summary
    emplist = models.staff.objects.values('empId', 'name')
    fDate = request.POST.get('fromDate')
    tDate = request.POST.get('toDate')
  
    if request.GET.get('empId_id'):
      sel = attendance.objects.filter(empId_id=request.GET.get('empId_id'),)
      for i in sel:
          # print i.
          # print   i.outTime
          # print i.inTime.hour,i.inTime.minute,i.inTime.second - i.outTime.hour,i.outTime.minute,i.outTime.second
          ss = i.inTime.hour
          ss1 = 12 - ss
          mm = i.outTime.hour
          mm1 = (12 + mm) - 12
          print ss1 + mm1
  </code></pre>