You can run an AWS Glue crawler on demand or on a regular schedule. When you
set up a crawler based on a schedule, you can specify certain constraints, such as the
frequency of the crawler runs, which days of the week it runs, and at what time. You can
create these custom schedules in cron format. For more information, see
cron
When setting up a crawler schedule, you should consider the features and limitations of cron. For example, if you choose to run your crawler on day 31 each month, keep in mind that some months don't have 31 days.
