Why Are There Only 24 Days On An Advent Calendar. An advent calendar is used to count down to christmas day. Although some advent calendars do have a dec 25th window, they are strictly incorrect as they should have 24 only, if the calendar is to reflect advent properly.

Originating in the 19th century, advent calendars help you count down the days until christmas, with a surprise gift to open each day leading up to it in december. Why are some advent calendars only 12 days?