You add a calculated date to specify a recurring event, such as Friday of the first week of even months. Calculated dates are also used for events or holidays that do not always fall on the same date each year.
In WorkStation, in the System Tree pane, select the calendar that you want to add the exception dates to.
Click the Calendar Editor tab.
On the Calendar Editor toolbar, click the Add Calculated button
In the Edit Calendar Entry dialog box, in the Entry name box, type the name that you want to display on the date list.
In the Month box, select a month for the calculated date.
In the Week of month box, select the week of month for the calculated date.
In the Day of week box, select a weekday for the calculated date.
Click OK .
On the File menu, click Save .