Set your DVRs we have a lift off date! Hawaii Five-O will premier on Monday, September 20th! Check out CBS for the full schedule. Monday, Sept. 20 8:00-8:30 PM  HOW I MET YOUR MOTHER (6th Season Premiere) 8:30-9:00 PM RULES OF ENGAGEMENT (5th Season Premiere) 9:00-9:30 PM  TWO AND A HALF MEN (8th Season Premiere)…