Setting Up Agile Planner → System Settings → Company Calendar
You can use the Company Calendar tab to customize the calendar being used by your organization. You can define your organization's working and non-working days, you can define the days in your organization's working week, and you can define the number of hours in a day that makes up a full working day. These settings are used to determine resource capacity and scheduling for resources that are used in task plans or for the number of days that can appear in a sprint burndown chart. Individual resources have their own calendars and they may override company calendar settings in their local calendar (if they are given permission to do so).
Working days are the days in a week, month, and year that count towards resource allocation and resource capacity.
The default number of working hours per day is eight.
Working weeks are the weeks in a year, typically grouped by month (within quarters).