Cron Expression Builder
Build and validate cron expressions visually. See human-readable descriptions and next execution times for any cron schedule.
****** * * * *Every minute
About Cron Expression Builder
Writing cron expressions from memory is error-prone, especially for complex schedules. The Cron Expression Builder gives you a visual interface to compose, validate, and understand cron schedules without memorizing the syntax.
Visual schedule builder
Use dropdown menus and selectors to define each of the five cron fields: minute, hour, day of month, month, and day of week. Choose between specific values, ranges, intervals, or wildcards for each field. The resulting cron expression updates in real time as you make selections.
Human-readable descriptions
Every expression is translated into plain English so you can verify the schedule at a glance. Instead of deciphering "30 4 1,15 * *" on your own, the tool tells you it means "at 4:30 AM on the 1st and 15th of every month."
Next execution preview
See the next five dates and times when the cron job would fire, calculated from your current local time. This is invaluable for catching off-by-one errors or confirming that a schedule behaves correctly across month boundaries and daylight saving transitions.
Common presets
Start from one of the built-in presets - every minute, every hour, daily at midnight, weekly on Sunday, or monthly on the first - and customize from there. Presets are a fast way to get a working expression and then tweak it for your exact needs.
Copy the finished expression to your clipboard and paste it straight into your crontab, CI/CD pipeline, Kubernetes CronJob manifest, or cloud scheduler configuration.
Frequently Asked Questions
What is a cron expression?
A cron expression is a string of five fields separated by spaces that defines a recurring schedule. The fields represent minute, hour, day of month, month, and day of week. Special characters like asterisks (every value), slashes (intervals), commas (lists), and hyphens (ranges) let you describe complex schedules concisely.
What does */5 mean in a cron expression?
The syntax */5 means "every 5th unit." In the minute field, */5 triggers at minutes 0, 5, 10, 15, 20, and so on. You can use this interval syntax in any field to create evenly spaced schedules.
How do I schedule a job for weekdays only?
Set the day-of-week field to 1-5 (Monday through Friday). For example, "0 9 * * 1-5" runs at 9:00 AM every weekday. In standard cron, 0 represents Sunday and 6 represents Saturday.
Are the next execution times accurate?
The next execution times are calculated locally in your browser based on the cron expression and your system clock. They give you a reliable preview of when the schedule would fire, though actual execution depends on the cron daemon or scheduler running on your server.