Greenwich Mean Time
Greenwich England is where world time is set. Find official time anywhere in the world. Software download available from the National Institute of Standards and Technology (NIST) that synchronizes your PC clock with the official time.
Choose time zone from list of countries worldwide, to see current official time. Once the time zone has been selected, a complete list of countries (or regions of larger countries) in that same time zone is displayed. This is also displayed as a world map. You may be surprised by how little connection there is between time zones and lines of longitude. www.timeticker.com