Support active timezone (#750)

* Support active timezone

* Add pytz to 3rd-parties

django_filters/utils.py

@@ -146,7 +146,7 @@ def resolve_field(model_field, lookup_expr):
 
 def handle_timezone(value, is_dst=None):
     if settings.USE_TZ and timezone.is_naive(value):
-        return make_aware(value, timezone.get_default_timezone(), is_dst)
+        return make_aware(value, timezone.get_current_timezone(), is_dst)
     elif not settings.USE_TZ and timezone.is_aware(value):
         return timezone.make_naive(value, timezone.utc)
     return value

setup.cfg

@@ -9,5 +9,5 @@ skip=.tox
 atomic=true
 multi_line_output=3
 known_standard_library=mock
-known_third_party=django,rest_framework
+known_third_party=django,pytz,rest_framework
 known_first_party=django_filters

tests/test_fields.py

@@ -3,9 +3,16 @@
 import decimal
 from datetime import datetime, time, timedelta, tzinfo
 
+import pytz
 from django import forms
 from django.test import TestCase, override_settings
-from django.utils.timezone import get_default_timezone, make_aware
+from django.utils.timezone import (
+    activate,
+    deactivate,
+    get_current_timezone,
+    get_default_timezone,
+    make_aware
+)
 
 from django_filters.fields import (
     BaseCSVField,
@@ -169,6 +176,25 @@ def test_datetime_timezone_awareness(self):
         self.assertTrue(isinstance(d.tzinfo, tzinfo))
         self.assertEqual(d, r)
 
+    def test_datetime_timezone_with_current_timezone(self):
+        z = pytz.timezone('Asia/Tokyo')  # Central European Time +01:00
+
+        f = IsoDateTimeField()
+        r = make_aware(self.reference_dt, get_default_timezone())
+
+        activate(z)
+        d = f.strptime(self.reference_str + "+01:00", IsoDateTimeField.ISO_8601)
+        deactivate()
+        self.assertTrue(isinstance(d.tzinfo, tzinfo))
+        self.assertEqual(d, r + r.utcoffset() - d.utcoffset())
+
+        activate(z)
+        d = f.strptime(self.reference_str + "", IsoDateTimeField.ISO_8601)
+        deactivate()
+        self.assertTrue(isinstance(d.tzinfo, tzinfo))
+        self.assertEqual(z.zone, d.tzinfo.zone)
+        self.assertEqual(d, r + r.utcoffset() - d.utcoffset())
+
     @override_settings(USE_TZ=False)
     def test_datetime_timezone_naivety(self):
         # parsed datetimes should obey USE_TZ