When did my country start implementing the seven-day May Day holiday? And the origin of May Day?

On December 23, 1949, the Chinese Government Administration Council issued the "National Holidays and Anniversary Holiday Measures", which added the statutory holidays of the Spring Festival, May Day and National Day to a 7-day holiday nationwide. Since 2008, the May Day Golden Week has become a 3-day May Day holiday

May Day Labor Day Source:

1. Workers went on strike in Chicago, USA, to commemorate this The great workers' movement, at the founding conference of the Second International in 1889, announced that May 1st of each year would be designated as International Labor Day. The Government Affairs Council of the Central People's Government of China made a decision in December 1949 to designate May 1 as Labor Day.

2. After the founding of New China, the Government Affairs Council of the Central People's Government designated May 1 as the statutory Labor Day in December 1949, and it was a national holiday. On this day every year, the whole country celebrates. People happily gather in parks, theaters, and squares to participate in various celebration rallies or cultural, sports and entertainment activities, and to commend workers who have made outstanding contributions.