How to change time in crontab in celery beat without explicitly refreshing celery beat from cmd,then how its possible to pass my new task in queue?

app.conf.beat_schedule = {
'send-mail-everyday': {
    'task': 'pizza_order.tasks.sub_task',
    'schedule': crontab(hour=d['hours'], minute=25),  # day_of_month,month_of_year
}

} This is crontab part. I have implemented scheduling from here to my task.