A base calendar defines the working hours for a day. In
a calendar, the working days and hours reflect the dates and time
during which the schedule activities are completed.
Depending on your business needs, you can create several calendars
with different working hours. You can associate these calendars to
a project according to the work pattern of the project.
You can set exceptions to the base calendars by defining non-working
days. These exceptions affect the project and resource calendars
that inherits the base calendar. Project specific exceptions can be
added to the project calendar, not in the base calendar.
Note: Both the project and resource calendars are instances of, and
based on the base calendar. When you set exceptions to the base calendar,
both the project and resource calendars are affected; however, if
you set exceptions to the project or resource calendars, the base
calendar is not affected.