International Workers' Day is a celebration of labour and the working classes that is promoted by the international labour movement and occurs on May 1 every year.
國際勞動節是勞工和工人階級的節日。它的是由國際工人運動推動產生的，并且被定于每年的5月1日。
May 1 was chosen as the date for International Workers' Day by the Socialists and Communists of the Second International to commemorate the Haymarket affair in Chicago that occurred on May 4, 1886
5月1日這個日子是由第二國際的為紀念1886年5月4日發生在芝加哥的“干草市場事件”而確定的。
Still other countries celebrate a Labour Day unrelated to International Workers' Day and on other dates significant to the labour movement in that country, such as the Labor Day in the United States which is on the first Monday of September.
仍然有國家不在5月1日慶祝勞動節，而選擇在別的日子來慶祝、紀念本國的工人運動。比如，美國的勞動節是定于每年9月的第一個星期一。
