Crontab Validator

* * * * *
Every minute */5 * * * *
Every 5 minutes 0 * * * *
Every hour 0 0 * * *
Daily at midnight 0 2 * * 1-5
2am weekdays 0 0 1 * *
1st of month @daily
Daily shortcut @weekly
Weekly shortcut @monthly
Monthly shortcut @reboot
At reboot