--- a/frontends/web/app.py
+++ b/frontends/web/app.py
@@ -324,6 +324,9 @@ def decode_page():
             day_phrase = request.form.get('day_phrase', '')
             pin = request.form.get('pin', '').strip()
             rsa_password = request.form.get('rsa_password', '')
+            
+            # Get encoding date from form (detected from filename in JS)
+            stego_date = request.form.get('stego_date', '').strip()
             
             if not day_phrase:
                 flash('Day phrase is required', 'error')
@@ -373,7 +376,8 @@ def decode_page():
                 day_phrase=day_phrase,
                 pin=pin,
                 rsa_key_data=rsa_key_data,
-                rsa_password=key_password
+                rsa_password=key_password,
+                date_str=stego_date if stego_date else None
             )
             
             if decode_result.is_file: