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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+13 is 13 hours ahead of Greenwich Mean Time (GMT).
Samoa, which comes under the GMT/UTC+13 hours offset, operates Daylight Saving Time (DST). Rawati Islands, part of the Kiribati republic, do not use DST. Find out more about other time zones using our geographical selector.
The following countries or regions use the offset +13 either in Standard time or Daylight Saving Time as indicated.