What Is a Cron Expression?

A cron expression defines minute, hour, day, month and weekday values to run scheduled jobs.

Open Cron generator

Cron fields

Classic cron has five fields: minute, hour, day of month, month and day of week.

For example, 0 9 * * * means every day at 09:00.

Does a cron expression include a time zone?

Classic five-field cron uses the host system time zone.

What does 0 9 * * * mean?

It means every day at 09:00 in the host system time.