Happy New Year!
To you traditionalists!
This used to be new year's day. Makes sense since today's feast celebrates the conception of Christ and Christians believe that life begins at conception. So up until 1753 this was it.
This is from Catholic Nexus:
Roman Church historian Dionysius Exiguus, in calculating his history of the Christian Church, took this day as the supposed date of the Annunciation. March 25th afterward became the first day of the calendar year, until the Gregorian Calendar Reform of 1753 changed the day to January 1st.