Current time in tables of places in the world. Can be sorted and otherwise customized. Includes meeting planner and other time-related tools.
  http://www.timeanddate.com/worldclock/  [Site Details]

Look up current time from database containing any country or major city in the world. Displays the time, the GMT offset, a globe image, and a section map.
  http://www.worldtimeserver.com  [Site Details]

Details and discusses the two distinct views on the real meaning of time.
  http://en.wikipedia.org/wiki/Time  [Site Details]

The official US time. Public service cooperatively provided by the two time agencies of United States.
  http://www.time.gov  [Site Details]