Abu Huraira reported: The Messenger of Allah, peace and blessings be upon him, said, “The best day on which the sun has risen is Friday. Adam was created on Friday and on it he entered Paradise and on it he was expelled from therein. The Hour will not be established except on Friday.”

Source: Sahih Muslim 854

Grade: Sahih (authentic) according to Muslim

http://dailyhadith.abuaminaelias.com/2011/06/10/the-best-day-on-which-the-sun-has-risen-is-friday/