[EMAIL PROTECTED] (Alan Kruse) writes: |> What is the difference between Universal Coordinated Time (UTC) and |> Greenwich Mean Time?
Greenwich Mean Time is a historic term that is no longer used among time-keeping experts or in many languages (other than English). There is no modern official definition of what GMT is exactly, but astronomers generally will tell you that GMT is pretty much the same as the modern astronomical definition of time they call UT1 today. UTC is a time produced by precision clocks (mostly cesium resonantors) that is guaranteed to be within 0.9 seconds of UT1. So the difference between UTC and GMT is: < 0.9 s For non-astronomical purposes, e.g. computer timekeeping, UTC is the modern-day replacement for GMT. UTC is today widely announced with far greater accuracy over radio signals than any time called GMT ever was. http://en.wikipedia.org/wiki/Universal_Time http://en.wikipedia.org/wiki/Coordinated_Universal_Time http://en.wikipedia.org/wiki/GMT Markus -- Markus Kuhn, Computer Laboratory, University of Cambridge http://www.cl.cam.ac.uk/~mgk25/ || CB3 0FD, Great Britain _______________________________________________ questions mailing list [email protected] https://lists.ntp.isc.org/mailman/listinfo/questions
