When the constitution of 1962 was abrogated?

The Constitution of 1962 was promulgated by President Ayub Khan in Pakistan. This constitution established a presidential system of government. However, due to widespread political unrest and a deteriorating law and order situation, it was eventually abrogated. The correct date for its abrogation is 25th March 1969, when General Yahya Khan took over power and imposed martial law, marking a significant turning point in Pakistan's political history. The other dates provided are historically inaccurate for this event.