A project calendarA calendar of working days or shifts that establishes those ... More lists time intervals in which activities or resources can or cannot be scheduled. A projectA temporary endeavour undertaken to create a unique product,... More usually has one default calendar for the normal workweek, but many have other calendars as well. Each calendar can be customised with its own holidays and extra workThe total number of hours, people or effort required to comp... More days. Resources and activities can be attached to any of the calendars that are defined.