Format: minute hour day month weekday — e.g. 0 */6 * * *
Runs minute at 0, hour at 9, every day of month, every month, day of week from 1 through 5.
- minute0→ minute at 0
- hour9→ hour at 9
- day of month*→ every day of month
- month*→ every month
- day of week1-5→ day of week from 1 through 5