fix timezone converter bug

app.py

@@ -31,7 +31,7 @@ def convert_timezone(dt: datetime, target_tz: str) -> str:
     if dt.tzinfo is None:
         raise ValueError("dt must be timezone-aware")
 
-    return f"When time in {dt.tzinfo} is {dt.strftime('%Y-%m-%d %H:%M:%S')}, the time in {target_tz} is: {dt.astimezone(ZoneInfo(target_tz)).strftime('%Y-%m-%d %H:%M:%S')}
+    return f"When time in {dt.tzinfo} is {dt.strftime('%Y-%m-%d %H:%M:%S')}, the time in {target_tz} is: {dt.astimezone(ZoneInfo(target_tz)).strftime('%Y-%m-%d %H:%M:%S')}"
 
 @tool
 def get_current_time_in_timezone(timezone: str) -> str: