[Tools] Fix for join time with no ms

tools/tools.py

@@ -756,7 +756,11 @@ class Tools(commands.Cog):
 
     @staticmethod
     def _dynamic_time(time):
-        date_join = datetime.datetime.strptime(str(time), "%Y-%m-%d %H:%M:%S.%f")
+        try:
+            date_join = datetime.datetime.strptime(str(time), "%Y-%m-%d %H:%M:%S.%f")
+        except ValueError:
+            member_created_at = f"{str(member.created_at)}.0"
+            date_join = datetime.datetime.strptime(str(time), "%Y-%m-%d %H:%M:%S.%f")
         date_now = datetime.datetime.now(datetime.timezone.utc)
         date_now = date_now.replace(tzinfo=None)
         since_join = date_now - date_join