To change the reporting time periods:

Default Setting for the Reporting Time Periods Are Set as Follows: 

Breakfast: 6:00am to 10:00am

Lunch: 10:00 am to 4:00 pm

Dinner 4:00 pm to 11:00 pm 

Late Night: 11:00 pm to 6:00 am

Log into Management Console

Go under Setup

System Preferences

Select reporting time periods. 

This would be i.e. 

Breakfast, Lunch, Dinner. They are set up for the times the sales will report for.