django - Caught VariableDoesNotExist while rendering: Failed lookup for key [time_filter] in u'[{}, -

views.py

def when(request):     user = request.user     report = report.objects.get(user=request.user)     reportform = reportform(instance=report)        settings = settings.objects.get(user=request.user)     settingsform = settingsform(instance=settings)      settings=settings.objects.get(user=2)     if settings.date_format == '0':         date_filter = 'd/m/y'     else:         date_filter = 'm/d/y'     if settings.time_format == '0':         time_filter = 'i:mp'     else:         time_filter = 'h:m'     if request.method == 'post':                     reportform = reportform(instance=report,data=request.post)         if reportform.is_valid():             report = reportform.save(commit=false)              report.user = request.user             report.save()             return redirect('/member/media/')      return render_to_response('incident/when.html',{                   'newreport_menu': true,                    'form': reportform,                   },                    context_instance=requestcontext(request)) 

template is

{{ form.manual_time|date:time_filter }} {{ form.manual_date|date:date_filter }} 

giving error in date_filter , time_filter in template,the error "caught variabledoesnotexist while rendering: failed lookup key [time_filter] in u'[{},"

you haven't included time_filter or date_filter in context dictionary pass render_to_response.