Do You Start With 1 Or 24 On Advent Calendar. If you want to start your own advent calendar, you may come across two different trains of thought. An advent calendar starts with the first day, which is usually december 1st (if you have 24, 25 or 31 days advent calendar).

While the date for advent sunday varies each year—advent begins on november 28th in 2021, most advent calendars begin on december 1 and continue for 24 days ­. In other words, you would count back from 24.