In all ReliaSoft desktop applications except MPC, actions and Project Planner gates contain important dates like start dates and due dates. You can specify which dates will be considered working days for all actions and gates in the database. This way, an action's cost/time estimates, as well as its duration, will be based solely on working days.
To define the working days for the database, choose File > Manage Database > Working Days/Holidays. (In a secure database, this is available only for users with the "Manage project planning resources and working days" permission.)
In the window that appears, use the Define Work Week area on the left side to specify which days of the week will be considered regular working days (e.g., Monday-Friday).
On the Define Holidays tab, you can define three different types of holidays.
Fixed Date - Recurring holidays occur every year on the same calendar date (e.g., New Year's Day is always January 1).
Variable Date - Recurring holidays occur every year, but not always on the same date (e.g., Thanksgiving is always the fourth Thursday of November).
Fixed Date - Non-recurring holidays occur once and do not happen again. For example, a specific Monday could become a non-working day due to weather conditions.
In the Holiday Properties window, select Move to adjacent working day if necessary to make sure the holiday will be observed when a) it occurs outside the work week, but b) there is a regular working day immediately before/after it. In this case, the holiday is observed on the nearest working day. (If there is a working day immediately before and after the holiday, it is observed on the following day.)
The View Observed Holidays tab allows you to easily examine the names and dates of all holidays that will be observed during the work week, and can also help you make sure your working days/holidays settings are correct. Specify the years you want to view in the Displayed Range in Years area.