An alternative view:

Dec 23: Christmas Adam

Dec 24: Christmas Eve

Dec 25: Christmas Day

Dec 26: 2nd Day of Christmas

aka Boxing Day

Dec 27: 3rd Day of Christmas

Dec 28: 4th Day of Christmas

Dec 29: 5th Day of Christmas

Dec 30: 6th Day of Christmas

Dec 31: 7th Day of Christmas

aka New Year’s Eve

Jan 01: 8th Day of Christmas

aka New Year’s Day

Jan 02: 9th Day of Christmas

Jan 03: 10th Day of Christmas

Jan 04: 11th Day of Christmas

Jan 05: 12th Day of Christmas

aka Twelfth Night

Jan 06: Epiphany (Gregorian, trad.)

aka Three Kings’ Day

aka Little Christmas

Looking to celebrate Christmas throughout the year.

🎄🎄🎄✨🎄🎄🎄

🎄MERRY CHRISTMAS!🎄

🎄🎄🎄🤱🏽🎄🎄🎄

Thanks to @Bearetta for a fun joke and the inspiration to comment on the calendar!