Here is where you can setup your hours of operations for each day of the week.
Select a day from the DOW dropdown.
If this is the day that you want your week to start on check the "Start of Week" checkbox.
Set the hour in which your store will open, and select if it is AM or PM.
Be sure to set this to the earliest possible time that an order may go live, in the case of deferred orders, or an employee may clock in. This will ensure that all orders and timeclock records are accounted for on the proper business day.
Set the hour in which your store will close, and select if it is AM or PM. If the store is open past midnight; click the "Next Day" box to indicate that close time is actually the next day. This will be important for reporting and payroll.
Be sure to always save your changes.