The most important and widely celebrated public holiday of the year is Tet, the Lunar New Year, which coincides with the cycle of the moon. This public holiday usually takes place in late January or early February and lasts officially for three days, although many businesses are closed the entire week. Other important public holidays include the Liberation of Saigon (April 30), International Worker's Day (May 1), Ho Chi Minh's birthday (May 19), and Vietnamese National Day (September 2).