You can access the Business Hours and Holidays setting to define the working hours and holidays for your business.

Working days, hours, and holidays are helpful when assigning resources to tasks and service orders. They are also factored in when using the Gantt View of projects.

To access the Business Hours and Holidays setting, click the following icon.

This will open the following form.

Here, you can set the "From" and "To" hours and mark which days of the week you celebrate the weekend.

Here, you can set the holidays your company observes, and when creating, you can choose whether or not the holiday repeats every year.

Here, you can set up holidays that vary in date in future years. Holidays that repeat every year are automatically added to the future years' holiday schedules.