On what date was the 1962 Constitution of Pakistan implemented?

The 1962 Constitution of Pakistan came into effect on 8th June under the regime of President Ayub Khan. It introduced a presidential form of government replacing the parliamentary system and concentrated significant powers in the presidency. The constitution aimed to ensure administrative efficiency but faced criticism for limiting democratic representation. It also established a unicameral legislature and introduced the system of Basic Democracies for local governance. Although it was later replaced it marked an important phase in Pakistan’s constitutional evolution and reflected the political dynamics of the early 1960s in the country.