DateBook keeps track of birthdays, anniversaries, holidays, appointments or any event you want to keep track of. Warning notices or reminders of upcoming events are displayed upon startup based on the amount of notice you require. Features include many event types: onetime, every other week, monthly, quarterly, annually and events such as the first Sunday of every month or the fourth Thursday in November. A number of predefined events are included (Easter, Daylight Savings Time, and other holidays) and can be quickly added to your date book.