Iftikhar Muhammad Chaudhry was restored as Chief Justice by the Supreme Court on _____?

Iftikhar Muhammad Chaudhry was restored as Chief Justice by the Supreme Court on July 20, 2007, when a 13-member bench of the Supreme Court, in a landmark decision, set aside the Presidential reference against him and declared his suspension illegal. He was later dismissed again on November 3, 2007, when General Pervez Musharraf declared a state of emergency and imposed a Provisional Constitutional Order (PCO). After a long period of protests known as the Lawyers' Movement, he was eventually restored to his position through an executive order by Prime Minister Yousaf Raza Gillani on March 16, 2009, and officially re-assumed office on March 22, 2009.