added date format validation

app.py

@@ -13,6 +13,9 @@ pipe = pipeline("automatic-speech-recognition", model="Artanis1551/whisper_swedi
 
 
 def process_video1(date):
+    # If the date is not in YYYY-MM-DD format, return an error message
+    if not date or len(date) != 10 or date[4] != "-" or date[7] != "-":
+        return "", "Please enter a date in the format YYYY-MM-DD."
     try:
         video_path = download_video1(date)