fix

src/populate.py

@@ -53,7 +53,7 @@ def get_leaderboard_df(results_dataset_name: str) -> pd.DataFrame:
                 "Organization": first_row["organization"],
                 "Success Rate (%)": success_rate,
                 "Problems Solved": num_solved,
-                "Submitted On": pd.to_datetime(first_row["submission_ts"].strftime("%Y-%m-%d %H:%M")),
+                "Submitted On": pd.to_datetime(first_row["submission_ts"]).strftime("%Y-%m-%d %H:%M"),
             }
         )