根据用户输入使用django-celery安排任务

I am building a reporting portal using django. In this portal I need to give users the ability to schedule reports to run on a reoccurring basis. I have been researching django-celery and understand that you can use the periodic_task decorator to schedule a reoccurring task but in all the examples I have seen the cron schedule information is hard coded into the decorator.I am building a reporting portal using django.