As an admin, you can customize the list of Time Off types that your team will pick from to log off-work hours. The default list includes common options such as Sick Day, Vacation and Public Holiday, but you can easily add others:
In your admin area, go to Time Off types, under Manage and add or edit options for your team. All team members will have access to the same options.
You'll notice that Time Off types have a property called Date range which, when enabled, will allow users to enter a start and end date for their Time Off period. This is not recommended for Public Holidays, but it's good for other Time Off types that can take multiple consecutive days, such as a Vacation or a Parental Leave.