Decode cron expressions in seconds

What Is a Cron Expression?

A cron expression is a compact, five-field string that tells a scheduler exactly when to run a task. The fields represent minute, hour, day of month, month, and day of week, in that order. Cron originated in Unix systems during the 1970s and remains the de facto standard for time-based job scheduling in Linux servers, CI/CD pipelines, Kubernetes CronJobs, and cloud services such as AWS EventBridge and Google Cloud Scheduler.

How to Use This Cron Helper

Type or paste any five-field cron expression into the input and the tool will instantly parse it, showing you the next five upcoming run times in UTC. If you are unsure where to start, select one of the built-in presets -- such as "Every hour" or "Every weekday at 8am" -- and the expression will be populated automatically. From there you can tweak individual fields until the schedule matches your requirements. The copy button lets you grab the finished expression for use in your crontab, CI config, or application code.

Cron Syntax Quick Reference

Each of the five fields accepts single values, ranges (1-5), lists (1,3,5), and step values (*/10). An asterisk (*) means "every possible value." Combining these operators gives you fine-grained control: for example, 0 9-17 * * 1-5 fires at the top of every hour during business hours on weekdays. Remember that day-of-week values run from 0 (Sunday) through 6 (Saturday) in standard cron, though some implementations also accept 7 for Sunday.

Common Scheduling Patterns

• Heartbeat checks: */5 * * * * runs every five minutes, ideal for uptime monitoring.
• Nightly backups: 0 2 * * * triggers at 2 AM daily, a common choice for database dumps.
• Weekly reports: 0 9 * * 1 fires every Monday at 9 AM for start-of-week summaries.
• Monthly billing: 0 0 1 * * runs at midnight on the first of each month.
• Business-hours tasks: 0 8 * * 1-5 executes at 8 AM on weekdays only.