When the first General Elections under the 1973 constitution were held?

When the first General Elections under the 1973 constitution were held?

آئین 1973 کے تحت پہلے عام انتخابات کب ہوئے؟
Explanation

The first General Elections under the 1973 constitution of Pakistan were held in 1977.

The elections were held on March 7, 1977.

They were won by the Pakistan Peoples Party (PPP) led by Zulfikar Ali Bhutto.