When Is The 12th Day Of Christmas In 2024. For many, christmas day marks the “first day”, which would give twelfth night its earlier date, while others believe the 12 days of christmas begin on boxing day. The 12 days begin on christmas day because this is the day that celebrates jesus’ birth.
In ancient times, the day began with midnight mass. United states 2024 holiday calendar with all major holidays and observances.