Vietnam Unlimited Festival (Tet) or "Limited Nguyen Dan" (Tet Nguyen Dan):. means the festival the first dawn of the year. Considered as the most important religious festival. It begins one week before the New Year. The lunar Between late January and early February, on the 15th day of the lunar equator, the sun is far most of the winter to date. Equinoctial (equinox) in the spring to celebrate their faith in god, Confucianism, Taoism and Buddhism as well as an homage to the ancestors.