Three out of China's four main public holidays are known as 'golden weeks', a concept conceived by the government in 1999 but now under revision due to the massive overcrowding on transport during the holiday periods. In 2008 the Labour Day golden week in May was cut to three days, with the remaining days being spread over three other traditional Chinese festivals which are to become official public holidays: Tomb Sweeping Day, Dragon Boat Festival and Mid-Autumn Festival. Traditionally, the first golden week marks the Spring Festival (Chinese New Year) and starts on the first lunar day of the first lunar month of the Chinese calendar, usually falling somewhere in late January or February. The second starts on Labour Day and the third on China’s National Day. Foreign consulates also close on Christmas Day, Boxing Day and at Easter, and some western companies prefer to stay open during some golden weeks. Secondary schools get 10 or 11 weeks of holiday and primary schools 13 weeks. Both are spread over summer, Chinese New Year, March and April.