Defines a <a class="localLink" href="http://schema.org/Date">Date</a> or <a class="localLink" href="http://schema.org/DateTime">DateTime</a> during which a scheduled <a class="localLink" href="http://schema.org/Event">Event</a> will not take place. The property allows exceptions to a <a class="localLink" href="http://schema.org/Schedule">Schedule</a> to be specified. If an exception is specified as a <a class="localLink" href="http://schema.org/DateTime">DateTime</a> then only the event that would have started at that specific date and time should be excluded from the schedule. If an exception is specified as a <a class="localLink" href="http://schema.org/Date">Date</a> then any event that is scheduled for that 24 hour period should be excluded from the schedule. This allows a whole day to be excluded from the schedule without having to itemise every scheduled event.