When was the cancan composed?

There seems to be some confusion in your query. The cancan is not a musical composition but rather a lively, high-kicking dance that originated in France during the 19th century. It was initially considered a scandalous and provocative dance due to its energetic movements and revealing costumes. The cancan became widely popular in cabarets and dance halls in Paris and later gained international recognition. Therefore, it does not have a specific date or composer associated with its creation, but it emerged as a cultural phenomenon during the mid-19th century.