Allowed date edit in forum post in admin

widget_alipins/forum/models.py

@@ -6,6 +6,7 @@ class Post(models.Model):
     post_title = models.CharField(max_length=50)
     post_body = models.TextField(max_length=1500)
     pub_date = models.DateTimeField("date published", auto_now_add=True)
+    pub_date.editable=True
     author = models.ForeignKey(WidgetUser, on_delete=models.CASCADE)
     post_image = models.ImageField(null = True, blank = True, upload_to = "forum/")