Crontab Generator

Create and understand cron expressions

Presets

“Every 15 minutes, between 09:00 and 17:59, Monday through Friday”

Minute0–59Hour0–23Day of month1–31Month1–12Day of week0–6 (Sun=0)

Evaluate in UTC

*/15 9-17 * * 1-5 /usr/local/bin/backup.sh

Add with crontab -e. Use absolute paths — cron runs with a minimal PATH.