Cron Expression Parser

About This Tool

The Cron Expression Parser analyzes 5-field cron expressions and translates them into plain English descriptions. It shows a field-by-field breakdown (minute, hour, day, month, weekday), a human-readable schedule summary, and the next 5 upcoming run times from the current moment.

Cron is the standard Unix job scheduler. Expressions are widely used in cloud platforms (AWS EventBridge, GitHub Actions, Kubernetes CronJobs, crontab) to schedule recurring tasks. All parsing runs in your browser — no expression data is sent to any server.

How to Use

1. Enter a cron expression in the input field (e.g., 0 9 * * 1-5).
2. Click Parse or select one of the 8 preset expressions.
3. Review the per-field breakdown and human-readable description.
4. Check the Next 5 runs section to verify the schedule is correct.

Cron Field Reference

Format: minute hour day-of-month month day-of-week. Ranges: minute 0–59, hour 0–23, day 1–31, month 1–12, weekday 0–7 (0 and 7 = Sunday). Special values: * = every unit; */n = every n units; a-b = range;a,b,c = list of values. Example: 0 9 * * 1-5 = every weekday at 9:00 AM.

Use Cases

DevOps engineers verify cron expressions before deploying scheduled jobs to production. Developers debugging missed or unexpected task runs use the next-run preview to confirm timing. Teams setting up data pipeline schedules use preset expressions as starting templates. System administrators document crontab entries by converting cryptic expressions to plain English for team documentation.

FAQ

• Does this support 6-field or 7-field cron expressions? — No. This tool parses standard 5-field Unix cron. AWS and Quartz schedulers use 6- or 7-field variants with seconds or years.
• What timezone does the next-run calculation use? — Your local browser timezone. Cron jobs on servers run in the server's timezone, which may differ.
• How do I run a job every 5 minutes? — Use */5 * * * *.