Update app.py

app.py

@@ -10,7 +10,7 @@ from Gradio_UI import GradioUI
 # Below is an example of a tool that does nothing. Amaze us with your creativity !
 
 @tool
-def convert_time_only(time_str: str, from_tz_str: str, to_tz_str: str, fmt="%H:%M": str) -> str:
+def convert_time_only(time_str: str, from_tz_str: str, to_tz_str: str, fmt: str ="%H:%M") -> str:
     """A tool that converts a given time from a source timezone to a destination timezone using today's date.
 
     Args: