want to find when the job will be started in celery

Question

i am new to celery. i have some configuration in celeryconfig.py as follow:

from datetime import timedelta

BROKER_URL='redis://localhost:6379/0'
CELERY_RESULT_BACKEND="redis"
CELERY_REDIS_HOST="localhost"
CELERY_REDIS_PORT=6379
CELERY_REDIS_DB=0
CELERY_IMPORT=("mail")

CELERYBEAT_SCHEDULE={'runs-every-30-seconds' :
                        {
                                'task': 'mail.mail',
                                'schedule': timedelta(seconds=30),
                        },
                    }

i have scheduled that the job will run periodically in 30 seconds. now i want that the jobs should start on 29 aug at 4:00PM then how should i configure this??

Answer 1

You should use Cron instead of timedelta. The Celery documentation discusses this specifically, and provides some useful examples. See Crontab schedules

Here is an example from Celery:

from celery.schedules import crontab

CELERYBEAT_SCHEDULE = {
    # Executes every Monday morning at 7:30 A.M
    'every-monday-morning': {
        'task': 'tasks.add',
        'schedule': crontab(hour=7, minute=30, day_of_week=1),
        'args': (16, 16),
    },
}

To make this work for your condition, you will also need to specify the cron month_of_year parameter.