Base and Overlay Calendars
Base calendars maintain basic information regarding working times (for example, hours in the standard working week), and overlay calendars define non-working time exclusions (for example, public holidays) which can be applied to a base calendar at runtime.
A base calendar is associated with a particular timezone, while an overlay calendar is timezone-neutral, and so can be applied to modify different base calendars. A default base calendar is provided with the TIBCO ActiveMatrix BPM system, and you can create additional base calendars.
TIBCO ActiveMatrix BPM uses the working and non-working times defined in these system calendars when performing date calculations on system objects. For example, when TIBCO ActiveMatrix BPM schedules a user task, it uses the system calendars to calculate the work item’s duration and any deadline.
Maintaining these Calendars is an administrative function, which is carried out in TIBCO Openspace - see System Calendar Management.