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Issues with project or global calendar used with such dates added added, in upcoming execution will be marked as being in state "Calendar Day Off" (1):
Upcoming scheduled issues executions, are to show "Action" as "Calendar day off", meaning no action of set triggers is to happen at that date (1):
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Calendar can be assigned to a Scheduled Issue on the third step of Create Scheduled Issue or Edit Scheduled Issue wizard (as presented here). It is possible to choose from Global Calendars or Project Calendars created for a particular project.
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It is possible to select "Default calendar" within each project (for Project Calendars) and for the whole JIRA Jira (for Global Calendars). This means, during creating new Scheduled Issue, that calendar will be selected by default.