Newswatcher, You are right, the end of the fast is still signalled by a canon in Bur Dubai...this signals Iftar, you can now break your fast. However, the opening time of the Bars stays fixed throughout the month unlike the length of the fast which gets longer and longer each day!
By the way, you are right about the start of Ramadan, it all depends on the sighting of the new moon...but I think it will begin around the 6th of Nov this year, it moves back 10days every year.
F-S