Cron Expression Parser

Cron Expression Format

A cron expression consists of five fields separated by spaces: minute hour day-of-month month day-of-week. Each field can contain a number, a range (1-5), a list (1,3,5), a step (*/10), or a wildcard (*).

Field Ranges

• Minute: 0–59
• Hour: 0–23
• Day of month: 1–31
• Month: 1–12
• Day of week: 0–6 (0 = Sunday)

Common Patterns

• * * * * * — every minute
• */5 * * * * — every 5 minutes
• 0 * * * * — every hour at minute 0
• 0 9 * * * — daily at 9:00 AM
• 0 9 * * 1-5 — weekdays at 9:00 AM
• 0 0 1 * * — midnight on the 1st of every month
• 0 0 1 1 * — midnight on January 1st (yearly)