GMT is Greenwich Mean Time (GMT).
GMT or GMT+0 is also known as Zulu time. UK is not on GMT all-year round. In the summer, UK time is GMT+1, that is British Summer Time (BST).
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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 hour difference. 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.
The following countries or regions use GMT either in Standard time or Daylight Saving Time as indicated.