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.
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The following countries or regions use the offset +13 either in Standard time or Daylight Saving Time as indicated.