In countries which use the Gregorian calendar, New Year's Day is usually celebrated on 1 January. The order of months in the Roman calendar has been January to December since King Numa Pompilius in about 700 BC, according to Plutarch and Macrobius. However, Roman writers identified years by naming the year's consuls, who did not enter office on 1 January until 153 BC. Since then 1 January has been the first day of the year, except during the Middle Ages when several other days were the first (1 March, 25 March, Easter, 1 September, 25 December). With the expansion of Western culture to the rest of the world during the twentieth century, the 1 January date became global, even in countries with their own New Year celebrations on other days (e.g., China and India). At present, the celebration of the New Year is a major event worldwide. Many large-scale events are held in major cities around the world, with many large fireworks events on New Year's Eve (31 December). Sydney launched over 80,000 fireworks at midnight, and had more than one and a half million attendees; it was also the most-watched event on television worldwide last year. In Valparaiso upwards of two million visitors witnessed the largest fireworks display in a natural setting; a total of more than 21 kilometers of fireworks on the bay, from the commercial port city of Valparaiso to Concon, Chile, all in 25 minutes of entertainment. London's New Year celebrations centre around the London Eye, with an impressive fireworks display while Big Ben strikes midnight. In New York, the celebration is focused around a large crystal ball that descends in a one minute countdown in Times Square. Edinburgh plays host to one of the world's largest Hogmanay events. The celebrations last for four days and attract visitors from around the globe to take part in street parties and attend concerts. In the culture of Latin America there are a variety of traditions and superstitions surrounding these dates as omens for the coming year. January remains a symbol of the New Year's celebration. According to the Christian tradition, 1 January coincides with the circumcision of Christ (eight days after birth), when the name of Jesus was given to him (Luke 2: 21).

This day commemorates the March 1st Movement in 1919. On March 1 of this year, the Korean people declared their nation's independence from Japan. It was a catalyst for the establishment of the Provisional Government of the Republic of Korea(April 13, 1919).

The day on which to esteem the personalities of children and plan for their happiness. In Korea, Children's Day started on May 1, 1922, when 8 persons including Bang Jeong-hwan declared the Day and held an anniversary. In 1946, the Day changed to May 5, and became a public holiday in 1975.

The day commemorates men and women who died while in military service or independence movement. It was originated from the traditional customs of Mangzhong, one of the 24 solar terms. On this day, national commemorating ceremony is held in National Cemetery.

The day celebrates promulgation of the Constitution of the Republic of Korea in 1948.

The day celebrates national liberation from Japan in 1945. On this day, Emperor Shōwa announced surrender and World War II was ended. On the same day of 1948, the government of the Republic of Korea was established. The word "Gwangbok" means "restoration of light".

Gaecheonjeol is a public holiday in South Korea on October 3. Also known by the English name National Foundation Day, this holiday celebrates the creation of the state of Gojoseon (ancient Korea) founded by Dangun Wanggeom in the year 2333 BC.

Christmas is commonly called "Seongtanjeol (성탄절,聖誕節)" in Korean(especially among Christians), but official Korean name fixed by law is "Gidoktansinil". In South Korea, Christianity is the one of two major religions, with Buddhism. Christmas or Christmas Day is an annual Christian holiday commemorating the birth of Jesus Christ. It is celebrated on December 25, but this date is not known to be Jesus' actual birthday, and may have initially been chosen to correspond with either the day exactly nine months after some early Christians believed Jesus had been conceived, a historical Roman festival, or the date of the northern hemisphere's winter solstice. Christmas is central to the Christmas and holiday season, and in Christianity marks the beginning of the larger season of Christmastide, which lasts twelve days