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From How to create a document | Developer Pages
# Reminder schedule
If you set up reminders, you need to specify a schedule in cron format (quartz). There are multiple resources on the web to help you set up the schedule. Here are some of them:
* https://www.freeformatter.com/cron-expression-generator-quartz.html
* http://www.quartz-scheduler.org/documentation/quartz-2.x/tutorials/crontrigger.html
From Signicat Express API | Developer Pages
Defines a chron expression that control the interval of the reminders (Use UTC time). We use Quartz cron expressions, read more about it here: http://www.quartz-scheduler.org/documentation/quartz-2.x/tutorials/crontrigger.html.