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About This Tool
The Cron Expression Parser breaks down 5-field cron schedule expressions into intuitive time and calendar components.
In Unix administration, backend microservices, and scheduled automation jobs, crontab syntax defines exact trigger timings for recurring maintenance tasks, database backups, and queue processing.
### The 5 Standard Cron Fields Standard Unix cron expressions consist of five space-separated fields evaluated from left to right: 1. Minute (0–59): Specific minute of the hour, or step intervals like */15. 2. Hour (0–23): Hour of the day in 24-hour military time. 3. Day of Month (1–31): Specific calendar day of the month. 4. Month (1–12): Numeric month of the year (January through December). 5. Day of Week (0–7): Day of the week (where 0 and 7 represent Sunday).
### Concrete Schedule Example Enter the expression "30 2 * * 1-5" into the parser: - Minute: 30 (half-past the hour) - Hour: 2 (2:00 AM) - Day of Month: * (every day of the month) - Month: * (every month) - Day of Week: 1-5 (Monday through Friday) This translates to running a scheduled job at 02:30 AM every weekday morning.
### Processing and Privacy All cron parsing and string tokenization execute client-side in your web browser. No server crontabs or cron expressions leave your computer.
How to Use
- 1
Enter or paste a 5-field cron expression into the input field (e.g. "*/15 * * * *").
- 2
Review the five visual summary cards displaying Minute, Hour, Day of Month, Month, and Day of Week.
- 3
Adjust values, ranges, or step intervals to verify the timing breakdown.
Frequently Asked Questions
What does an asterisk (*) mean in a cron expression?
An asterisk represents a wildcard meaning "every" possible value for that field (for example, * in the hour field means every hour).
What does a step value like */15 represent?
A forward slash introduces a step interval. In the minute field, */15 triggers every 15 minutes starting from minute 0 (0, 15, 30, and 45).
Does this tool support 6-field quartz cron expressions with seconds?
This tool visualizes the standard 5-field Unix/Linux crontab format (minute, hour, day of month, month, day of week).
Are my cron expressions saved on a server?
No. All parsing runs locally in your browser memory.