To manage your company's business schedules(s) go to Manage --> Business Schedules:
Then, you can either create a new one or edit an existing schedule by clicking on the name.
The business schedule editor contains two sections, Hours of Operation & Special Hours.
Hours of Operation
This section allows you to specify what hours the office is open per day of the week.
If the office is closed on a specific day, change the button from "Open" to "Closed" by clicking it.
This section allows you to add special days the office will be closed, this will be mostly utilized for holidays or office vacation days.
The date can either be a one-time add or can be set to occur on the same day every year.