Facebook certificate error

Hello, up to yesterday facebook was working well some days ago but now facebook doesnt open in any browser in my computer it says ssl eror and your connection is not private wih message"This server could not prove that it is www.facebook.com; its security certificate expired 3 day(s) ago. This may be caused by a misconfiguration or an attacker intercepting your connection. Your computer's clock is currently set to Sunday, October 18, 2015. Does that look right? If not, you should correct your system's clock and then refresh this page.
You cannot proceed because the website operator has requested heightened security for this domain." my date and time are correct but it is not working what sall I do?