# Cron Expression Generator Guide
Cron is a time-based job scheduler in Unix-like computer operating systems. Users that set up and maintain software environments use cron to schedule jobs (commands or shell scripts) to run periodically at fixed times, dates, or intervals.
Cron Format
* * * * *- Minute (0 - 59)
- Hour (0 - 23)
- Day of Month (1 - 31)
- Month (1 - 12)
- Day of Week (0 - 7) (Sun is 0 or 7)
Common Special Characters
*: Any value,: Value list separator-: Range of values/: Step values