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Nowadays, Greenwich Mean Time, abbreviated as GMT, is a time zone designation rather than a time standard. Time difference between time zones can be expressed by the GMT or UTC offset. In the UTC standard, there is a commitment to keep within 0.9 seconds of GMT, so that every few years a leap second is applied to UTC. In the age of the internet, these small clock calibrations are conveniently distributed via NTP.
UTC/GMT-6 is 6 hours behind Greenwich Mean Time (GMT).
The GMT/UTC minus 6 hours offset is used in the Central Standard Time Zone in USA. It is also in use when USA states in the Mountain Time Zone operate Daylight Saving Time.
The following countries or regions use the offset -6 either in Standard time or Daylight Saving Time as indicated.