Cron Expression Parser

Parse cron schedules into human-readable plain language descriptions.

Category: Developer

How to Use Cron Expression Parser

  1. Paste or type your input string, code snippet, or text block into the cron expression parser editor.
  2. Configure formatting rules, target case, indent spacing, or encoding parameters.
  3. Click Process to execute the transformation instantly inside browser memory.
  4. Copy the formatted output or download it as a text file.

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Frequently Asked Questions

What are the 5 standard fields in a Linux crontab expression?

A standard cron expression consists of 5 space-separated fields: Minute (0-59), Hour (0-23), Day of Month (1-31), Month (1-12 or JAN-DEC), and Day of Week (0-6 or SUN-SAT, where 0 and 7 both represent Sunday).

What does the asterisk (*) and step value (/) mean in cron syntax?

An asterisk ('*') is a wildcard representing all possible values for that field. A slash ('/') specifies step increments; for example, '*/15' in the minute field means 'every 15 minutes' (0, 15, 30, 45).

How does the parser translate common cron schedules into plain English?

The parser recognizes standard scheduling conventions: '*/5 * * * *' becomes 'Every 5 minutes', '0 0 * * *' becomes 'Every day at midnight (00:00)', and '0 12 * * 1-5' becomes 'Every weekday (Monday through Friday) at noon'.

What is the difference between standard 5-field cron and 6-field cron?

Standard Unix/Linux crontab uses 5 fields (minutes to day-of-week). Extended schedulers like Quartz, AWS EventBridge, or Spring Framework often use 6 or 7 fields by adding a Seconds field at the beginning or a Year field at the end.

How do Day of Month and Day of Week interact in cron?

In standard crontab, if both Day of Month and Day of Week are explicitly specified (not wildcards), the job triggers when EITHER condition is met (logical OR), which can sometimes surprise developers expecting an AND relationship.