When Does The 12 Days Of Christmas Officially Begin?

After listening to the classic Christmas song "The 12 Days Of Christmas" it got me thinking: When officially does the 12 days start? We have an answer. 

According to WhyChristmas, the 12 days of Christmas start on Christmas Day and last until the evening of the 5th January. Actually, the 12 Days have been celebrated in Europe since before the middle ages and were a time of celebration, and still are.

Each day has a special purpose. Don't confuse these days with the song:

Day 1 (25th December): Christmas Day - celebrating the Birth of Jesus
Day 2 (26th December also known as Boxing Day): St Stephen’s Day. He was the first Christian martyr (someone who dies for their faith). It's also the day when the Christmas Carol 'Good King Wenceslas' takes place.
Day 3 (27th December): St John the Apostle (One of Jesus's Disciples and friends)
Day 4 (28th December): The Feast of the Holy Innocents - when people remember the baby boys which King Herod killed when he was trying to find and kill the Baby Jesus.
Day 5 (29th December): St Thomas Becket. He was Archbishop of Canterbury in the 12th century and was murdered on 29th December 1170 for challenging the King’s authority over Church.
Day 6 (30th December): St Egwin of Worcester.
Day 7 (31st December): New Years Eve (known as Hogmanay in Scotland). Pope Sylvester I is traditionally celebrated on this day. He was one of the earliest popes (in the 4th Century). In many central and eastern European countries (including Austria, Bosnia and Herzegovina, Croatia, the Czech Republic, Germany, Hungary, Israel, Italy, Luxembourg, Poland, Slovakia, Switzerland and Slovenia) New Years Eve is still sometimes called 'Silvester'. In the UK, New Years Eve was a traditional day for ‘games’ and sporting competitions. Archery was a very popular sport and during the middle ages it was the law that it had to be practised by all men between ages 17-60 on Sunday after Church! This was so the King had lots of very good archers ready in case he need to go to war!
Day 8 (1st January): 1st January - Mary, the Mother of Jesus
Day 9 (2nd January): St. Basil the Great and St. Gregory Nazianzen, two important 4th century Christians.
Day 10 (3rd January): Feast of the Holy Name of Jesus. This remembers when Jesus was officially 'named' in the Jewish Temple. It's celebrated by different churches on a wide number of different dates!
Day 11 (4th January): St. Elizabeth Ann Seton, the first American saint, who lived in the 18th and 19th centuries. In the past it also celebrated the feast of Saint Simon Stylites (who lives on a small platform on the top of a pillar for 37 years!).
Day 12 (5th January also known as Epiphany Eve): St. John Neumann who was the first Bishop in American. He lived in the 19th century."

So to answer your heated holiday debate, the 12 days start on Christmas day.