Fixed RemovedInDjango50Warning in handle_timezone with Django 4.2. (#…

…1581)

Fixes #1580.

Unless USE_DEPRECATED_PYTZ is present and True, we should not be passing the
is_dst parameter.

django_filters/utils.py

@@ -231,7 +231,18 @@ def resolve_field(model_field, lookup_expr):
 
 def handle_timezone(value, is_dst=None):
     if settings.USE_TZ and timezone.is_naive(value):
-        if django.VERSION < (5, 0):
+        # Pre-4.x versions of Django have is_dst. Later Django versions have
+        # zoneinfo where the is_dst argument has no meaning. is_dst will be
+        # removed in the 5.x series.
+        #
+        # On intermediate versions, the default is to use zoneinfo, but pytz
+        # is still available under USE_DEPRECATED_PYTZ, and is_dst is
+        # meaningful there. Under those versions we should only use is_dst
+        # if USE_DEPRECATED_PYTZ is present and True; otherwise, we will cause
+        # deprecation warnings, and we should not. See #1580.
+        #
+        # This can be removed once 3.2 is no longer supported upstream.
+        if django.VERSION < (4, 0) or (django.VERSION < (5, 0) and settings.USE_DEPRECATED_PYTZ):
             return timezone.make_aware(value, timezone.get_current_timezone(), is_dst)
         return timezone.make_aware(value, timezone.get_current_timezone())
     elif not settings.USE_TZ and timezone.is_aware(value):