VSys can use holidays for communication (e.g. automatically sending Christmas or birthday greetings to someone when they log into the kiosk) and for knowing when certain jobs won't be done (e.g. no book deliveries on New Year's Eve). There are a large number of built-in holidays in VSys, and you can define your own as well.
From the Setup panel, click on Holidays.
There are three kinds of holidays:
Click Add holiday to create a new one, click on any holiday to edit it or right-click on a holiday to Edit, Disable or Delete it.