Update app.py

converting to datetime

app.py

@@ -124,7 +124,7 @@ def add_new_eval(
         "model": repo_id,
         "precision": precision,
         "status": "PENDING",
-        "submitted_time": current_time,
+        "submitted_time": pd.to_datetime(current_time),
         "task": task,
         "likes": model_info.likes,
         "params": model_size}