It is celebrated on 25 December across the world annually with full enthusiasm. The day reminds the birth of Jesus Christ, the son of God.
For Western Christian churches, Christmas Day always occurs on December 25, though some cultures observe the main celebration on the night prior, Christmas Eve.
The oldest existing record of a feast to celebrate the birth of Christ in the western Church is in the Roman almanac called the Chronographer (or Chronograph) of 354, also know as the Philocalian Calendar. This almanac noted that a festival commemorating Christ’s birth was observed by the church in Rome in the year 336.
About 350 A.D., Pope Julius I set December 25 as the date when the Church would commemorate when Jesus was born. Many historians believe that the Church stirred up interest in a festival at this time of year to counter the pagan festivals surrounding the solstice, but no historical document unequivocally explains Rome’s reasons for setting the date as December 25.