Enter here masked date when you want this event to happen. If you enter full date (like dd.mm.yyyy), you create Onetime event and that event happens only on that specific day, after what it expires. However, if you enter masked date with only date (dd.__.____) or date and month (dd.mm.____), you create Recurring event that repeats once a month, or once a year in second case. Order of entering dd (date), mm (month), yyyy (year) and sign for date separator depend entirely on your regional windows settings, and is displayed as a "Valid date formats..." label below masked date.