Free Cron Expression Generator
Build cron schedule expressions with a visual GUI or type directly. Get a plain-English description and see the next 5 scheduled run times. Auto-saves your last expression.
0–59
0–23
1–31
1–12
0=Sun–6=Sat
Common Presets
About Cron Expression Generator
Cron is a Unix-based job scheduler that runs tasks at specified times. A cron expression consists of 5 fields separated by spaces: Minute, Hour, Day of Month, Month, and Day of Week. This tool helps you build expressions visually and verifies them by showing the next scheduled run times.
Cron Expression Syntax Reference
| Symbol | Meaning | Example |
|---|---|---|
| * | Any/every value | * (every minute/hour/etc.) |
| , | Value list | 1,15,30 (at minutes 1, 15, 30) |
| - | Range | 9-17 (hours 9 through 17) |
| / | Step | */15 (every 15 units) |
Frequently Asked Questions
Standard Unix cron uses the server's local timezone. Most cloud schedulers (AWS EventBridge, GitHub Actions) use UTC. Always check your platform's timezone setting and add a comment to your crontab noting the timezone.
Some systems (Spring, AWS) add a Seconds field as the first field, giving 6 total. Standard Unix/Linux cron uses 5 fields (no seconds). This tool generates standard 5-field expressions.
Standard cron does not support sub-minute intervals. To run every 30 seconds, use two crontab entries: one for :00 and one for :30, or use a loop in your script with a sleep 30 between iterations.