About Cronuru

Cronuru is for engineers who write cron expressions across more than one stack. Every cron-flavored scheduler — Linux crontab, Kubernetes CronJob, AWS EventBridge, GitHub Actions, Spring, Quartz — has its own slight variation of the syntax. Cronuru shows you how the same schedule looks in each one, plus the gotchas that only matter on certain platforms.

What's here

• A parser that explains any expression in plain English with the next ten run times in your timezone.
• Per-pattern landing pages for the schedules you'll actually write — every 5 minutes, every weekday at 9 AM, the first of every month, etc. Each one includes copy-paste snippets for every major scheduler.
• Dialect references for Unix, Quartz, Kubernetes, AWS EventBridge, Spring, and GitHub Actions — field counts, special characters, edge cases, and the things that differ between them.
• Guides for the conceptual pieces: how the five fields work, why day-of-month and day-of-week behave unexpectedly when both are set, what happens to cron during daylight saving, etc.

How it works

Everything runs in your browser. There's no backend, no API, no analytics that tracks individual users — just a static site served from Cloudflare's edge. Parsing is done by cronstrue (for the human-readable explanation) and cron-parser (for the next run times).

Privacy

Cronuru uses Cloudflare Web Analytics, which is privacy-first: no cookies, no fingerprinting, no individual visitor profiles. See the privacy page for details.