From 8a94a48c09afbc1e1769b5d1503d47d44110bf3b Mon Sep 17 00:00:00 2001
From: chentiantian <chentiantian@myhexin.com>
Date: Fri, 14 Jun 2024 10:54:21 +0800
Subject: [PATCH] fix (schedulers): when model.date_changed is None, use
 _default.now()

---
 django_celery_beat/schedulers.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/django_celery_beat/schedulers.py b/django_celery_beat/schedulers.py
index 810152fc..25f932d6 100644
--- a/django_celery_beat/schedulers.py
+++ b/django_celery_beat/schedulers.py
@@ -84,7 +84,7 @@ def __init__(self, model, app=None):
         self.model = model
 
         if not model.last_run_at:
-            model.last_run_at = model.date_changed
+            model.last_run_at = model.date_changed or self._default_now()
             # if last_run_at is not set and
             # model.start_time last_run_at should be in way past.
             # This will trigger the job to run at start_time