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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+1 is 1 hour ahead of Greenwich Mean Time (GMT).
UK, Ireland and Portugal are on GMT/UTC+1 only during the Daylight Saving Time (DST) period. The +1 offset applies to the Western European Time Zone (WET), under different designations for each country
The following countries or regions use the offset +1 either in Standard time or Daylight Saving Time as indicated.