Fix tz issue

Author: milind-shakya-sp

django_celery_beat/models.py

@@ -120,7 +120,7 @@ def maybe_make_aware(self, dt):
 
 def maybe_make_naive(dt):
     if dt.tzinfo:
-        dt = dateutil.parser.parse(dt.now().isoformat())
+        dt = dt.replace(tzinfo=None)
     return dt