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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-8 is 8 hours behind Greenwich Mean Time (GMT).
USA and Canada have the GMT/UTC minus 8 hours offset when Daylight Saving Time is NOT in use.
The following countries or regions use the offset -8 either in Standard time or Daylight Saving Time as indicated.