diff --git a/src/adsb/concat_parquet_to_final.py b/src/adsb/concat_parquet_to_final.py
index 669a6ae..4cf796b 100644
--- a/src/adsb/concat_parquet_to_final.py
+++ b/src/adsb/concat_parquet_to_final.py
@@ -1,29 +1,34 @@
 from pathlib import Path
 import polars as pl
+import argparse
 
-OUTPUT_DIR = Path("./data/output")
+OUTPUT_DIR = Path("./outputs")
 
-compressed_dir = OUTPUT_DIR / "compressed"
-date_dirs = sorted(p for p in compressed_dir.iterdir() if p.is_dir())
-if not date_dirs:
-    raise FileNotFoundError(f"No date folders found in {compressed_dir}")
+def main():
+    parser = argparse.ArgumentParser(description="Concatenate compressed parquet files for a single day")
+    parser.add_argument("--date", type=str, required=True, help="Date in YYYY-MM-DD format")
+    args = parser.parse_args()
 
-start_date = date_dirs[0].name
-end_date = date_dirs[-1].name
-parquet_files = []
-for d in date_dirs:
-    parquet_files.extend(sorted(d.glob("*.parquet")))
+    compressed_dir = OUTPUT_DIR / "compressed"
+    date_dir = compressed_dir / args.date
+    if not date_dir.is_dir():
+        raise FileNotFoundError(f"No date folder found: {date_dir}")
 
-if not parquet_files:
-    raise FileNotFoundError("No parquet files found in compressed subfolders")
+    parquet_files = sorted(date_dir.glob("*.parquet"))
+    if not parquet_files:
+        raise FileNotFoundError(f"No parquet files found in {date_dir}")
 
-frames = [pl.read_parquet(p) for p in parquet_files]
-df = pl.concat(frames, how="vertical", rechunk=True)
+    frames = [pl.read_parquet(p) for p in parquet_files]
+    df = pl.concat(frames, how="vertical", rechunk=True)
 
-df = df.sort(["time", "icao"])
-output_path = OUTPUT_DIR / f"openairframes_adsb_{start_date}_{end_date}.parquet"
-print(f"Writing combined parquet to {output_path} with {df.height} rows")
-df.write_parquet(output_path)
-csv_output_path = OUTPUT_DIR / f"openairframes_adsb_{start_date}_{end_date}.csv"
-print(f"Writing combined csv to {csv_output_path} with {df.height} rows")
-df.write_csv(csv_output_path)
\ No newline at end of file
+    df = df.sort(["time", "icao"])
+    output_path = OUTPUT_DIR / f"openairframes_adsb_{args.date}_{args.date}.parquet"
+    print(f"Writing combined parquet to {output_path} with {df.height} rows")
+    df.write_parquet(output_path)
+
+    csv_output_path = OUTPUT_DIR / f"openairframes_adsb_{args.date}_{args.date}.csv"
+    print(f"Writing combined csv to {csv_output_path} with {df.height} rows")
+    df.write_csv(csv_output_path)
+
+if __name__ == "__main__":
+    main()
\ No newline at end of file