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Cron

Cron Expression Parser

Human-readable parsing of cron expressions · supports Chinese / English

Cron expression
✓ Every 5 minutes
Common presets
Field reference
FieldAllowedDescription
Minute0-59Which minute in the hour
Hour0-23Which hour in the day
Day1-31Which day of the month
Month1-12Month
Weekday0-60 = Sunday, 1 = Monday, …

Overview: Cron Expression Parser is a professional tool that translates the cryptic * * * * * syntax into a clear Chinese or English description, so operations engineers and developers can quickly verify when a scheduled task will fire. Built on cronstrue, it supports the standard 5-field cron syntax as well as common second-level extensions.

How to use: Step 1 — type a cron expression such as */5 * * * * in the input box; the tool describes the schedule in natural language below it in real time. Step 2 — illegal expressions show a red error message with the exact offending field and reason. Step 3 — pick Chinese or English at the top for internationalised teams. Step 4 — the "Common presets" area offers the most common schedules (every minute, hourly, daily, weekly, monthly) that fill the input on click. Step 5 — the "Field reference" table at the bottom shows the meaning and value range of each of the five cron fields for reference.

Typical scenarios: Linux administrators sanity-check an expression before saving crontab -e; DevOps engineers configure GitLab CI Schedule or GitHub Actions cron triggers; Kubernetes CronJob resource definitions are validated; back-end developers verify schedules for Quartz, node-cron and similar frameworks; data platform engineers configure the schedule expression of an Airflow DAG.

Technical notes: Standard cron has 5 fields, from left to right: minute (0–59), hour (0–23), day (1–31), month (1–12), day-of-week (0–6, where 0 is Sunday). It supports * (any), / (step, e.g. */5), - (range, e.g. 1-5) and , (list, e.g. 1,3,5). Day-of-week also accepts three-letter names MON-SUN. Some implementations (like Quartz) support 6 fields (extra seconds) or 7 fields (extra year); the tool tries to recognise these too.

Privacy: All parsing happens locally in your browser and the expression is never uploaded, so it is safe for validating cron configurations that contain internal system schedule information.

Frequently Asked Questions

How do I use Cron Expression Parser?
Step 2 — illegal expressions show a red error message with the exact offending field and reason. Step 3 — pick Chinese or English at the top for internationalised teams.
What can Cron Expression Parser do?
Typical scenarios: Linux administrators sanity-check an expression before saving crontab -e ; DevOps engineers configure GitLab CI Schedule or GitHub Actions cron triggers; Kubernetes CronJob resource definitions are validated; back-end…
Is my data private when I use Cron Expression Parser?
Privacy: All parsing happens locally in your browser and the expression is never uploaded, so it is safe for validating cron configurations that contain internal system schedule information. Privacy: All parsing happens locally in your browser and the expression is never uploaded, so it is safe for validating cron…
What technical details should I know about Cron Expression Parser?
It supports * (any), / (step, e.g. */5 ), - (range, e.g. 1-5 ) and , (list, e.g. 1,3,5 ). Day-of-week also accepts three-letter names MON - SUN .