What year did the Health and Safety Act come into force?

Many different countries have legislation called "Health and Safety Act", "Safety and Health Act," or something similar. They came into force in different years in each country. In the United States, the Occupational Safety and Health Act was passed in 1970 and came into force in 1971. In the United Kingdom, the Health and Safety at Work etc. Act was passed and came into force in 1974.