Cron Expression Explainer

A Cron Expression Explainer translates a five-field (or six-field with seconds) cron expression like "*/15 * * * *" into a human-readable schedule description and lists the next several scheduled execution times — all computed locally in your browser.

Every 15 minutes, every hour, every day

Presets

About Cron Expression Explainer

Paste any standard or Quartz-style cron expression and the tool describes what it means ("Every 15 minutes") and shows the next five upcoming runs in your local time zone. Common presets — every minute, hourly, daily at midnight, weekdays at 9 — are one click away. Powered by the cronstrue library plus a small in-house next-run calculator.

What Cron Expression Explainer does

Translates standard 5-field and Quartz 6-field cron expressions to plain English
Lists the next five scheduled runs in your local time zone
One-click presets — every minute, hourly, daily at midnight, weekdays at 9, weekly on Monday
Per-field editor with valid-value reminders (0-59, 0-23, etc.)
Powered by cronstrue plus an in-house next-run calculator

When to reach for Cron Expression Explainer

Validating a cron expression before pasting it into a Kubernetes CronJob spec
Translating a legacy crontab line a teammate asked you to review
Building a new schedule from a preset without memorizing the field order
Verifying that your '0 0 * * 0' actually runs when you expect it to

How to use Cron Expression Explainer

01
Pick a preset or type a pattern
Start from a preset (every 5 minutes, weekdays at 9) or enter your own 5- or 6-field cron expression.
02
Read the plain-English description
The explanation updates live; the next five run times appear in your local zone.
03
Copy the expression
Click Copy to put the canonical expression on your clipboard.

When to use Cron Expression Explainer vs alternatives

Alternative	Use Cron Expression Explainer when…	Use the alternative when…
crontab.guru	you want next-run previews in your local zone and Quartz seconds-field support.	you specifically want their UX or community examples.
Writing it from memory	you want to skip a 2 a.m. incident from a misplaced asterisk.	you write cron daily and trust your fingers.

Frequently asked questions

What cron flavor does this support?

Standard 5-field Unix/Linux cron (minute, hour, day of month, month, day of week). Quartz extensions like the optional seconds field and ? day-of-month wildcard are also recognised.

Why does my expression run more often than I expected?

If you specify both a day of month and a day of week, most cron implementations treat them as OR — the job runs on either match, not both. The explainer mentions this when relevant.

Can I generate a cron expression from scratch?

Yes — pick a preset ("every minute", "every 5 minutes", "daily at 09:00", "every Monday") as a starting point, then tweak the fields directly.

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Related concepts

Cron Expression
A cron expression is a five-field string (or six fields with the Quartz seconds extension) that describes a recurring schedule — used by Unix cron, Kubernetes CronJobs, GitHub Actions schedules, and most modern job runners to say things like 'every 15 minutes' or 'every weekday at 9am'.