There are three time differences between the UK and the US. If the time in London (Greenwich Mean Time) is midnight, then it will be 16.00 on the West Coast, e.g. Los Angeles, (eight hours backwards), 17.00 (seven hours backwards) in Arizona, 18.00 (six hours backwards) in Central USA, e.g. Chicago and 19.00 (five hours backwards) on the East Coast, e.g. New York.