code: def get_closing_rule_for_now(location):
      
      now = get_now()
  
      if location:
          return ClosingRules.objects.filter(company=location,
                                             start__lte=now, end__gte=now)
  
      return Company.objects.first().closingrules_set.filter(start__lte=now,
                                                             end__gte=now)
docs: Returns QuerySet of ClosingRules that are currently valid