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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.
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).
The following countries or regions use GMT either in Standard time or Daylight Saving Time as indicated.