Cron Expression Tool

Describe when it should run in plain language, or edit the cron expression directly.

Free · No signup · Multilingual schedule input

Natural Schedule · deterministic

When should it run?

Auto-detectENITESFRDEPTZHJAKOARHI

Describe a schedule

Understood asEvery day at 15:00
Generated cron0 15 * * *
Valid · Unix / Linux (POSIX core)

Browser local time. Strict five-field numeric core. Day-of-week uses 0=Sunday through 6=Saturday.

Schedule preview

Next executions

Browser local time
  1. 1
  2. 2
  3. 3
  4. 4
  5. 5
Quick start

Try an example

Five-field structure

Generated meaning

0Minute0–59
15Hour0–23
*Day of month1–31
*Month1–12
*Day of weekprofile dependent
*Any value
,List
-Range
/Step
Validation rules

Deterministic result

Natural Schedule currently uses a deterministic English/Italian parser. It converts the phrase to a structured schedule, compiles it for the selected environment, then sends the generated expression through the independent cron validator before showing it as valid.

It does not monitor jobs, call a server or send alerts. Unsupported or ambiguous schedules fail closed instead of guessing.

Choose the right cron environment

Cron syntax is similar across platforms, but not identical. Keep Unix/Linux, GitHub Actions and Cloudflare Workers separate so platform rules are not silently mixed.

Understand the schedule before you use it

Check all five fields, read a plain-language explanation and preview upcoming execution times. Unsupported or ambiguous schedules fail closed instead of being guessed.

FAQ

Does this monitor my cron jobs?

No. It validates and previews cron expressions locally in your browser.

Does the Cloudflare profile support L, W and #?

Cloudflare supports those extensions, but this version deliberately does not simulate them yet.

Why can GitHub Actions reject very frequent schedules?

GitHub Actions requires at least five minutes between scheduled workflow runs.