Calendars in Microsoft Project

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Microsoft Project uses three types of calendars as tools for scheduling the project, as shown in the following table.

Project calendar Governs when tasks are scheduled to be worked on and when resources are scheduled to work on assigned tasks.

Resource calendar Governs when resources are scheduled to work on assigned tasks. One group of resources (for example, day shift resources) can be assigned to a different base calendar than another group of resources (for example, swing shift resources). Each resource can have his or her own individual resource calendar, which can reflect special work schedules, personal days off, and vacation time. By default, the resource calendar is the Standard calendar.

Task calendar Governs when tasks are scheduled to be worked on. As a rule, tasks are scheduled according to the project calendar and the calendars of any assigned resources. However, sometimes a task has special scheduling requirements that are different from the norm. For example, a task might be carried out by a machine running 24 hours a day. In such a case, it's useful for a task to have its own calendar.

You can use any of the three base calendars (Standard, Night Shift, or 24 Hours) as the basis for the project calendar, resource calendars, or task calendars.

All three of these calendars can easily be customized for specialized working days and times. If you need to apply a common working schedule to a group of resources or a set of tasks and it isn't built in to Microsoft Project already, you can create your own base calendar.

For more information about the task calendar, see "Working with Task Calendars" on page 169. For more information about the resource calendar, see "Setting Resource Working Time Calendars" on page 187.

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