Update appStore/prep_data.py

appStore/prep_data.py

@@ -108,6 +108,12 @@ def remove_duplicates(results_list):
 
     return unique_results
 
+def extract_year(date_str):
+    try:
+        return str(datetime.strptime(date_str, "%Y-%m-%d").year)
+    except Exception:
+        return "Unknown"
+
 
 def get_max_end_year(_client, collection_name):
     """