Labor Day is also known as May Day and is a public holiday in many countries across the world. It usually occurs around May 1, but the date can vary. Labour Day in Canada is celebrated on the first Monday of September.The origins of Labour Day in Canada can be traced back to a printer's revolt in 1872 in Toronto when labourers tried to establish a maximum 54-hour workweek. At that time, any union activity was considered illegal and the organizers were jailed. Protest marches of over 10,000 formed in response. This eventually led to the Prime Minister Sir John A. Macdonald repealing the anti-union laws and arranging the release of the organizers as well. The parades held in support of the Nine-Hour Movement and the printers' strike led to an annual celebration. The date was officially declared as a national holiday in Canada on July 23rd 1894 by the government of Prime Minister John Thompson.