diff --git a/examples/date-diff.py b/examples/date-diff.py
index 241be85..470e002 100644
--- a/examples/date-diff.py
+++ b/examples/date-diff.py
@@ -45,7 +45,7 @@ start_time = date.today()
 print(start_time.strftime("%d.%m.%Y"))
 ruhestand = date(2025, 6, 10) 
 # Zeitdelta berechnen 
-duration = end_time - start_time 
+duration = ruhestand - start_time 
 print(duration) # Ausgabe: 9 Tage, 2:30:00
 
 def init_monitor():