Cron Expression Explainer
What is a Cron Explainer?
The Cron Explainer (or Cron Expression Parser) is a developer utility that translates complex Cron syntax into plain English. Cron is a time-based job scheduler in Unix-like operating systems, used to schedule commands to run periodically at fixed times, dates, or intervals.
Cron syntax consists of five fields: `Minute Hour Day Month Weekday`. While `* * * * *` is easy (every minute), expressions like `0 0 1,15 * 3` are hard to read at a glance. A mistake in a cron expression can lead to critical backups failing or emails sending at the wrong time.
This tool parses the string and provides a human-readable sentence describing the schedule. It validates the syntax to ensure you haven't used invalid ranges (like minute 61) and helps you confidently deploy your scheduled tasks.
1How to Use
- Enter Expression: Paste your Cron string into the input box (e.g., `30 2 * * 1`).
- Read Explanation: Instantly see the plain English translation (e.g., 'At 02:30 on Monday').
- Validate: If the background turns red or shows an error, check your syntax.
- Check Fields: Verify that you haven't confused the order (e.g., Minute comes before Hour).
★Key Features
- Natural Language Translation: Turns code into sentences.
- Real-time Parsing: Explains as you type.
- syntax Validation: Checks for basic structure and valid numeric ranges.
- Five-Field Support: Supports standard Unix cron format (Minute, Hour, Day of Month, Month, Day of Week).
- Example Reference: Helps you learn Cron syntax by experimenting.