How do I enter holidays whose dates do not follow a simple rule?
The calendar can handle holidays on a fixed date (like Chrismas day) or on a certain weekday in n-th week of a month. The American observance rule, whereby holidays with a fixed date that fall on a weekend are taken on the following Monday, is implemented. More complicated holidays like Eastern holidays can be entered on a year by year basis, by specifying a year (and not only a day and month). To facilitate the process of entering such holidays for each individual year, we provide the copy holiday function.