diff --git a/projects/conversion_csv_json/convert.py b/projects/conversion_csv_json/convert.py
new file mode 100644
index 0000000..dd33a77
--- /dev/null
+++ b/projects/conversion_csv_json/convert.py
@@ -0,0 +1,44 @@
+import csv
+import json
+import sys
+import os
+
+def csv_to_json(csv_filepath, json_filepath):
+    data = []
+    with open(csv_filepath, encoding='utf-8') as csvf:
+        csv_reader = csv.DictReader(csvf)
+        for row in csv_reader:
+            data.append(row)
+    with open(json_filepath, 'w', encoding='utf-8') as jsonf:
+        jsonf.write(json.dumps(data, indent=4))
+
+def json_to_csv(json_filepath, csv_filepath):
+    with open(json_filepath, 'r', encoding='utf-8') as jsonf:
+        data = json.load(jsonf)
+    if data:
+        with open(csv_filepath, 'w', encoding='utf-8', newline='') as csvf:
+            writer = csv.DictWriter(csvf, fieldnames=data[0].keys())
+            writer.writeheader()
+            writer.writerows(data)
+
+def auto_convert(input_file):
+    file_name, file_extension = os.path.splitext(input_file)
+    if file_extension.lower() == ".csv":
+        output_file = f"{file_name}.json"
+        csv_to_json(input_file, output_file)
+        print(f"Converted {input_file} to {output_file}")
+    elif file_extension.lower() == ".json":
+        output_file = f"{file_name}.csv"
+        json_to_csv(input_file, output_file)
+        print(f"Converted {input_file} to {output_file}")
+    else:
+        print("Unsupported file format. Please provide a .csv or .json file.")
+        sys.exit(1)
+
+if __name__ == "__main__":
+    if len(sys.argv) != 2:
+        print("Usage: python convert.py <input_file>")
+        sys.exit(1)
+    input_file = sys.argv[1]
+    auto_convert(input_file)
+
diff --git a/projects/conversion_csv_json/data/input.csv b/projects/conversion_csv_json/data/input.csv
new file mode 100644
index 0000000..e69de29
diff --git a/projects/conversion_csv_json/data/output.json b/projects/conversion_csv_json/data/output.json
new file mode 100644
index 0000000..e69de29
diff --git a/projects/dev/pto_countdown/main.py b/projects/dev/pto_countdown/main.py
index 970f193..99afb60 100644
--- a/projects/dev/pto_countdown/main.py
+++ b/projects/dev/pto_countdown/main.py
@@ -1,3 +1,5 @@
+#!/usr/bin/env python3
+
 from datetime import datetime, timedelta
 
 def calculate_reach_date(current_hours, max_hours, hours_added_bi_weekly):
@@ -40,4 +42,4 @@ reach_date = calculate_reach_date(current_hours, MAX_HOURS, HOURS_ADDED_BI_WEEKL
 
 # Output
 print(f"Current date: {datetime.now().strftime('%Y-%m-%d')}")
-print(f"You will reach the maximum hours on: {reach_date.strftime('%Y-%m-%d')}")
\ No newline at end of file
+print(f"You will reach the maximum hours on: {reach_date.strftime('%Y-%m-%d')}")