Just to be technical in the terminology, when Bill C-208 received royal assent, it became effective. It became part of law. It amended the Income Tax Act. On June 29, the date of royal assent, Bill C-208 amended the Income Tax Act. As of that date, the provisions it had amended were part of Canadian law. That's the date on which it came into law. That's just a fact and not something that could be changed.
On July 20th, 2021. See this statement in context.