when did the sugar act start

The Sugar Act, also known as The American Revenue Act, was passed by the British Parliament in 1764. It was a modified version of a previous piece of legislation, the Sugar and Molasses Act of 1733. Under the original Act, a tax of sixpence per gallon was placed on the importation of foreign (i.e. non-British) molasses into the American colonies. The point of the legislation was to protect British trade by making it more expensive for American merchants to buy molasses from the French West Indies.
However, the 1733 Act was widely ignored and evaded by American merchants, who continued to buy cheaper molasses from elsewhere, thus depriving the British Treasury of much-needed tax revenue. The Sugar Act was an attempt to remedy the situation. The provisions of the new law were based on a carrot and stick approach. On the one hand, the tax on imports was reduced from sixpence a gallon to threepence. On the other hand, a much more rigorous system of customs enforcement was put into effect to prevent merchants from evading their responsibility to pay tax.
More controversially, the Sugar Act also extended the number of foreign goods liable to pay customs duty. This proved to be a deeply unpopular measure as it severely restricted the number of countries and territories with which American colonists could trade. Inevitably, the new measures disrupted the colonial economy and made America more economically dependent on Britain. The Sugar Act generated an enormous amount of resentment, which only increased further in the wake of other ill-advised pieces of legislation such as the Currency Act, and the most notorious one of all, the Stamp Act. 
 
https://www.britannica.com/event/Sugar-Act