The Chinese New Year celebrations in Vietnam are known as Tet. Like the Korean New Year, it sometimes happens on a different day. In 1967, North Vietnam changed its time so that its capital Hanoi is now 1 hour different from Beijing. This means that the new moon happens a day earlier in Vietnam about one time every 24 years. Vietnamese people also add a 13th month to their calendar at a different time from the Chinese, who always try to put the 1st day of winter in their 11th month. In some years, this makes Tet happen in the month after the Chinese New Year.