In Christianity, under which the Gregorian calendar has evolved, the New Year is traditionally the festival of the circumcision of Christ, always followed as such by the Anglican Church and the Lutheran Church.
Mesopotamia (Iraq) introduced the concept of New Year celebration in 2000 BC. Ein and celebrated the new year at the time of the vernal equinox in mid-March.   The first Roman calendar marks March 1st as New Year’s Day. The calendar was only ten months old and started in March. The fact that the new year started once in March is still reflected in some of the names of the months. From September to December, from the ninth to the twelfth month, they were originally between the seventh and the tenth month. (Septem in Latin means “seven”, octo, “eight”, novem, “nine” and December “ten”). The Roman legend generally attributes to his second king Numa the foundation of the months of January and February. These were placed for the first time at the end of the year, but the first two months were taken into account.
The Kalenden of January (Latin: Kalendae Ianuariae) was celebrated as new year, after 153 years BC. The day of the inauguration of the new consuls was. The Romans had long and not consecutively dated their years in these consortia, and the January Kalenden began the new year by adapting that date. Nevertheless, private and religious celebrations around the new year of March have been going on for some time and there is no consensus on the question of the time allotted to the new state on 1 January.  As soon as the New Year arrived, it became a good time for family reunions and celebrations. A series of disasters, including the failure of the uprising of Mr. Aemilius Lepidus in 78 a. C., establishes a superstition which was to bring down the market days of Rome on the days of January, and the popes use intercalation to prevent it.  
In 567, the Council of Tours officially abolished the 1st of January at the beginning of the year. Many times and in different places of medieval Christian Europe, the New Year was celebrated on December 25 in honor of the birth of Jesus. March 1st in the old Roman style; March 25 in honor of the day of the woman and the feast of the Annunciation; and Easter holidays. These days were also significant from an astronomical and astrological point of view, since March 25th was considered the vernal equinox at the time of the Julian reform and December 25th as the winter solstice. (The slight disagreement between the Julian calendar and the solar year, howe
ver, changed in the days leading up to the Council of Nicaea, which was the basis of the calculations used in the Gregorian calendar reform.) Medieval calendars often continued to indicate month since January December, although its readers enjoy the transition from one year to another another day.
Among the pagans of the seventh century in Flanders and the Netherlands, it was customary to exchange gifts on the first day of the new year. San Eligio (deceased in 659 or 660) cried this custom and warned the Flemish and the Dutch: “No, do not make small animals, small deer or Iotticos or tables [for the house]. the puck] at night or exchanging New Year’s gifts or surplus drinks [another Christmas custom]. “ On the day of the New Year’s celebration by European Christians, they exchanged.
Christmas presents for the New Year in the Christian liturgical calendar of Western Christians in the twelve days. Lay people of Christmas;  The custom of exchanging Christmas gifts in the Christian context goes back to the biblical magicians who gave gifts to the baby Jesus.  
Because of the leap year error in the Julian calendar, the date of Easter had decreased since the First Council of Nicaea had decided to calculate the date of Easter in the year 325. In the 16th century, the deviation of observed equinox was unacceptable. In 1582, Pope Gregory XIII declared that the Gregorian calendar was widely used today and corrected the error by eliminating it for 10 days. The reform of the Gregorian calendar was also restored on January 1, New Year’s Day. Although most Catholic countries adopted the Gregorian calendar almost immediately, it was gradually taken over by the Protestant countries. For example, the British only adopted the Reform calendar in 1752. Until then, the British Empire and its American colonies celebrated the New Year on March 25th.
Most Western European countries officially acce
. pted January 1, just before their adoption, on New Year’s Day