Understanding Cron Syntax

A Cron expression is a string representing a schedule for executing automated backend tasks, database backups, or API calls. It consists of five distinct fields separated by white space.

First Asterisk: Minute (0 - 59)
Second Asterisk: Hour (0 - 23)
Third Asterisk: Day of the Month (1 - 31)
Fourth Asterisk: Month (1 - 12)
Fifth Asterisk: Day of the Week (0 - 6) (Sunday to Saturday)

Special Characters in Cron

Beyond simple numbers, developers use special operators to create complex schedules without writing extensive backend logic:

* (Asterisk): Specifies all possible values for a field. "Every minute" or "Every day".
, (Comma): Specifies a list of values. Example: 1,5,10.
- (Hyphen): Specifies a range of values. Example: 1-5 for Monday through Friday.
/ (Slash): Specifies step values. Example: */5 in the minute field means "every 5 minutes".