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What is a Cron Expression?

A cron expression is a string of 5 fields separated by spaces that define when a scheduled task should run. Each field represents a specific time unit:

  • *Minute (0-59)
  • *Hour (0-23)
  • *Day of Month (1-31)
  • *Month (1-12)
  • *Day of Week (0-6, where 0 is Sunday)

Example: 0 9 * * 1-5 means "At 9:00 AM, Monday through Friday"

Cron Expression Syntax Guide

Special characters you can use:

  • * (asterisk) = any value
  • , (comma) = value list separator
  • - (hyphen) = range of values
  • / (slash) = step values

Examples:

  • */15 * * * * = Every 15 minutes
  • 0 0 * * 0 = Every Sunday at midnight
  • 0 9,17 * * * = Daily at 9 AM and 5 PM