Do You Start An Advent Calendar With 1 Or 24

Do You Start An Advent Calendar With 1 Or 24. The first sunday of advent is also the beginning of the new liturgical year when we transition into a new liturgical cycle. I definitely do 1 > 24 but i guess you can treat it as a countdown.

The traditional day for starting advent ranges from november 27 and december 3. In 2020, that day is november 29.