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+0 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).
Enter your location or any place of your choice for more comparisons.
The following countries or regions use the offset +0 either in Standard time or Daylight Saving Time as indicated.