As you are configuring Microsoft Project Server 2010 for the first time, you can modify the default standard enterprise calendar to account for the working and nonworking times observed by your organization. You can modify any enterprise calendar at any time by selecting the calendar in Microsoft Project Web App, and making changes in Microsoft Project Professional 2010.
To modify an existing enterprise calendar:
On the Quick Launch, in the Settings section, click Server Settings.
On the Server Settings page, in the Enterprise Data section, click Enterprise Calendars.
Click the row that contains the calendar that you want to change, and then click Edit Calendar.
If the Windows Security dialog box appears, log on to Project Server 2010.
Project Professional 2010 opens and displays the Change Working Time dialog box.
Use the calendar with the Exceptions and Work Weeks tabs to modify the working and nonworking times for your organization.
For more information, see Modify working and nonworking times.
Click OK on the Change Working Time dialog box to save the new calendar to Project Server 2010.
Close Project Professional 2010.