title: combine() argument 1 must be datetime.date, not str
body: <p>When using queryset in Django date range getting error</p>
  
  <pre><code>from_date = request.POST.get('from_date')
  to_date = request.POST.get('to_date')
  min_dt = datetime.datetime.combine(from_date, datetime.time.min)
  max_dt = datetime.datetime.combine(to_date, datetime.time.max)
  daily_en = All_enquiries.objects.filter(enquired_at__range = (min_dt, max_dt))
  </code></pre>
  
  <p>when using variable manually value its working fine below</p>
  
  <pre><code>from_date = datetime.date(2019, 12, 9)
  to_date = datetime.date(2019, 12, 9)
  </code></pre>