[Python] how can celery execute a periodic task immediately？

I want to use celery to execute a periodic task.
According to the documentation: http://docs.celeryproject.org/en/latest/userguide/periodic-tasks.html#entries, I wrote down the following code:

app.conf.beat_schedule = {
'test_celery': {
'task': 'tasks.login.test_timertask',
'schedule': 60.0,
}
}


but when I run it as follows:

celery beat -A tasks.login --loglevel=info


the first task is executed after 60s.
I want to start the task once the worker starts rather than with 60 seconds delay. What should I do?

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