~/tools/cron-expression-parser

Cron Expression Parser & Generator

Parse, validate, and generate cron expressions instantly — with human-readable descriptions, next run times, timezone support, and 20+ presets.

// How to use

1. Paste or type a cron expression
2. Read the plain-English description
3. Check next run times with timezone
4. Use Builder tab to create from scratch
* Pick from 20+ presets or try the special char guide

100% client-side — no data leaves your browser

cron-parser — expression parser & generator

CRON EXPRESSION5-field (min hr dom mon dow) or 6-field with seconds

MINUTE

?HOUR

?DAY

?MONTH

?WEEKDAY

quick start:

What is a Cron Expression? How to Parse & Generate One?

A cron expression is a string that defines a schedule for recurring tasks. It originates from the Unix cron daemon and consists of 5 fields (or 6 with seconds) representing minute, hour, day of month, month, and day of week. Tools like AWS EventBridge, GitHub Actions, Kubernetes CronJobs, and most CI/CD systems use this format.

Common Use Cases

Scheduled Jobs

Run database backups, cleanup tasks, or batch jobs on a schedule

CI/CD Pipelines

Trigger nightly builds or automated test runs with GitHub Actions

AWS EventBridge

Schedule Lambda functions or Step Functions using cron rules

Kubernetes CronJobs

Define recurring pod execution schedules in k8s manifests

Data Pipelines

Orchestrate ETL workflows in tools like Airflow or dbt

Monitoring

Check system health, send reports, or rotate logs on a schedule