Calendars of any number can be defined to the system and easily modified online. They can apply to a dedicated owner or to the whole system.

The only purpose of having calendars in Entire Operations is to distinguish between working days and non-working days. Entire Operations does not perform any activities on non-working days. You can determine whether a job network scheduled for execution on a non-working day should be activated before or after the scheduled day or whether it should be cancelled.

On the other hand, if you want a job network to run, for example, each Friday, you do not need a calendar.

For more detailed information, see the sections Calendars and Calendar Maintenance in the User's Guide.