A standard Unix cron expression consists of 5 whitespace-separated fields:
┌───────────── Minute (0 - 59)
│ ┌─────────── Hour (0 - 23)
│ │ ┌───────── Day of Month (1 - 31)
│ │ │ ┌─────── Month (1 - 12 or JAN - DEC)
│ │ │ │ ┌───── Day of Week (0 - 7, where 0 and 7 are Sunday)
│ │ │ │ │
* * * * *Allowed Values per Field
| Field | Required | Allowed Values | Allowed Special Characters |
|---|---|---|---|
| Minute | Yes | 0–59 | * , - / |
| Hour | Yes | 0–23 | * , - / |
| Day of Month | Yes | 1–31 | * , - / ? L W |
| Month | Yes | 1–12 or JAN–DEC | * , - / |
| Day of Week | Yes | 0–7 (0/7 = Sun) or SUN–SAT | * , - / ? L # |