How do I update text in toga?

I am trying to create a simple clock app, and for that, I am using time. I want to update the time label

Imports

import toga
from toga.style import Pack
from toga.style.pack import COLUMN, ROW
import time

code

        self.time_label=toga.Label("00:00:00",style=Pack(padding=10,font_size=50))

I directly call the update_time() function in the startup method

        self.Update_time()

self.time_label is needed to change to the current time the text will change inside the Update_time() function

    def Update_time(self):
            current_time= time.strftime('%I:%M:%S')
            self.time_label.text=current_time

Now, I encounter that it only displays the time and does not change to the current time

For example, if I run the program at 9:22:56 it displays 9:22:56 but when it becomes 9:22:57, or 9:23:00, it still shows 9:22:56.

If you only call the update method once, then of course it will only update once. To update it regularly, you'll need to run an async task.

I think the startup method is called before the asyncio event loop is running, so instead you could override the on_running method, like this:

async def on_running(self):
    while True:
        self.Update_time()
        await asyncio.sleep(1)