Cron Expression Studio
Utilix Cron Expression Studio is a client-side crontab AST parser and schedule simulator that translates 5-field cron expressions into plain English and computes the exact next 10 UTC execution timestamps.
How to Test a Cron Expression and Preview the Exact Next 10 Execution Times?
Enter a 5-field cron string (such as `*/15 * * * *` or `0 9 * * 1-5`) into Utilix Cron Expression Studio or pick a quick preset to read a plain-English translation and verify the exact next 10 scheduled execution dates and times.
How to use Cron Expression Studio
- Enter 5-Field Cron Expression or Pick Preset: Type `[min] [hour] [day] [month] [weekday]` or select a preset schedule.
- Read Plain-English Translation: Verify the human-readable schedule summary and field-by-field breakdown.
- Inspect Next 10 Execution Timestamps: Review the simulated upcoming 10 trigger dates in UTC.
Frequently asked questions
What are the 5 fields in a standard cron expression?
From left to right: Minute (0–59), Hour (0–23), Day of Month (1–31), Month (1–12), and Day of Week (0–6, where 0 is Sunday).
What does `*/15 * * * *` mean?
The `*/15` step operator in the minute field means "run every 15th minute (0, 15, 30, 45) of every hour, every day."
Are these expressions compatible with GitHub Actions and Kubernetes CronJobs?
Yes, both GitHub Actions `on.schedule` and Kubernetes CronJobs use standard 5-field POSIX cron syntax evaluated in UTC.
Can I combine comma lists and hyphenated ranges like `0 9 * * 1-5`?
Yes, `1-5` in the Day of Week field runs Monday through Friday at 09:00.
Does it calculate leap years and month lengths accurately?
Yes, the simulator steps through real ECMAScript Date calendar boundaries.