[3.2.x] Refs #32365 -- Allowed use of non-pytz timezone implementations.

Backport of 10d126198434810529e0220b0c6896ed64ca0e88 from master

1 files changed, 5 insertions, 0 deletions

diff --git a/django/forms/utils.py b/django/forms/utils.py
index fbe79f1142..50412f414b 100644
--- a/django/forms/utils.py
+++ b/django/forms/utils.py
@@ -161,6 +161,11 @@ def from_current_timezone(value):
     if settings.USE_TZ and value is not None and timezone.is_naive(value):
         current_timezone = timezone.get_current_timezone()
         try:
+            if (
+                not timezone._is_pytz_zone(current_timezone) and
+                timezone._datetime_ambiguous_or_imaginary(value, current_timezone)
+            ):
+                raise ValueError('Ambiguous or non-existent time.')
             return timezone.make_aware(value, current_timezone)
         except Exception as exc:
             raise ValidationError(