Tet Nguyen Dan (also known as Tet Ca [1], Tet Ta, Lunar New Year, Traditional New Year or simply Tet) is the New Year's holiday according to the lunar calendar of the peoples of East Asia Cultural Area, including there are China, Japan, Korea and Vietnam. According to historical upheaval, the Japanese abandoned the Lunar New Year, while the Chinese, Koreans and Vietnamese still keep the tradition of celebrating this Tet even if they settle in other countries. In Vietnam, before Tet, there are also customs such as "worshiping Apple Quan" (23 December of lunar December) and "worshiping Tat Nien" (29 or 30 December of the lunar calendar). Because Tet is based on the lunar calendar, the Vietnamese Lunar New Year is later than the New Year (or Western New Year). Due to the rule of three leap years a month of the lunar calendar, the first day of the year of the Lunar New Year is never before January 21 of the solar calendar and after the February 19 of the solar calendar, but falls in between these days. The entire Lunar New Year holiday usually lasts about 7 to 8 days of the end of the old year and the first 7 days of the new year (December 23 to the end of January 7). [2] Every year, Tet is celebrated on the 1st (or 1st [3]) of the first lunar month throughout Vietnam and in some other countries where Vietnamese communities live. Sauce and kumquat in the North, Central or apricot in the South is considered an indispensable preparation in the days bordering Tet. Then, during the New Year, families get together, visit relatives, give good wishes, celebrate the age and worship ancestors.