Cron Expression Hub

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    Understanding Cron Expressions

    What is a Cron Expression?

    A cron expression is a string comprising five or six fields separated by white space that represents a set of times, normally as a schedule to execute a routine task.

    Special Characters

    • * (Asterisk) – Matches all values in the specific field descriptor layer.
    • / (Slash) – Describes increments of ranges. For example, */5 in the minutes field means every 5 minutes.
    • , (Comma) – Separates items in a discrete listing configuration (e.g., 1,2,5).
    • - (Hyphen) – Specifies continuous ranges of valid target items (e.g., 9-17).

    Standard Cron Syntax Field Order

    • Minute – 0 to 59
    • Hour – 0 to 23
    • Day of Month – 1 to 31
    • Month – 1 to 12 (or JAN-DEC)
    • Day of Week – 0 to 6 (Sunday=0, or SUN-SAT)