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Cron Expression Builder
Build cron expressions visually with dropdowns. Preview the next 5 execution times. Runs entirely in your browser — nothing is uploaded.
Schedule Builder
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Cron Expression Format
A cron expression has five fields: minute, hour, day of month, month, and day of week. Each field can be a specific value, a range (1-5), a list (1,3,5), or an interval (*/5).
Minute (0-59)
The minute of the hour. Use */5 for every 5 minutes.
Hour (0-23)
The hour of the day. 0 = midnight, 12 = noon.
Day/Month/Week
Day of month (1-31), month (1-12), weekday (0-7, 0=Sun).
Frequently Asked Questions
What is a cron expression?
A cron expression is a string of five fields that defines a schedule for running tasks. Each field represents a time unit: minute, hour, day of month, month, and day of week. For example, "0 9 * * 1-5" runs at 9 AM on weekdays.
Where are cron expressions used?
Cron expressions are used in Linux/Unix crontab, GitHub Actions, GitLab CI, Jenkins, serverless functions (AWS Lambda, Vercel Cron), and any job scheduler that supports cron syntax.
How do I read a cron expression?
Read left to right: minute (0-59), hour (0-23), day of month (1-31), month (1-12), day of week (0-7, where 0 and 7 = Sunday). For example, "0 9 * * 1-5" means "at 9:00 AM, Monday through Friday."