On which date is Death Anniversary of Quaid-e-Azam observed?

On which date is Death Anniversary of Quaid-e-Azam observed?

قائد اعظم کا یوم وفات کس تاریخ کو منایا جاتا ہے؟
Explanation

Muhammad Ali Jinnah born on 25 December 1876  died on 11 September 1948

He was the Pakistan's first Governor-General until his death.