Managing Holiday Rules for Tasks
Holiday Rules are collections of holiday dates that Administrators use when scheduling tasks.
After you create a Holiday Rule, you can apply the rule to an Organizational Unit and then apply the Organizational Unit to the schedule template. For example, you might have defined a Holiday Rule for all the yearly holiday dates for the "East Sales Region" Organizational Unit. When you select the "East Sales Region" as the Organizational Unit for a schedule, the predefined holiday dates apply to the tasks in the schedule.
See Applying a Holiday Rule to an Organizational Unit and Applying a Holiday Rule to a Schedule Template.