GMT — Greenwich Mean Time
UTC+0 / BST during DST
Current GMT Time
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Europe/London
Greenwich Mean Time (GMT) is the mean solar time at the Royal Observatory in Greenwich, London. It is equivalent to UTC+0. The United Kingdom uses GMT in winter and switches to British Summer Time (BST, UTC+1) during daylight saving time.
GMT Key Facts
- Full name: Greenwich Mean Time
- Abbreviation: GMT
- UTC offset: UTC+0
- DST: Switches to BST (UTC+1) during summer
- IANA identifier: Europe/London
- Countries: United Kingdom, Ireland, Portugal, Iceland, Ghana
- Major cities: London, Dublin, Lisbon, Accra, Reykjavik
Understanding GMT
Greenwich Mean Time (GMT) uses a UTC offset of UTC+0, placing it at the prime meridian baseline. During Daylight Saving Time, the region shifts to BST (UTC+1), moving clocks forward by one hour.
GMT is observed across 5 countries, including United Kingdom, Ireland, Portugal, Iceland, Ghana. Major metropolitan areas in this time zone include London, Dublin, Lisbon, Accra, Reykjavik, making it one of the most commercially active time zones in the world.
Frequently Asked Questions
What is GMT time?
GMT stands for Greenwich Mean Time. It is UTC+0, meaning it is the same as Coordinated Universal Time (UTC).
What countries use GMT?
GMT (Greenwich Mean Time) is used in United Kingdom, Ireland, Portugal, Iceland, Ghana. Major cities in this timezone include London, Dublin, Lisbon.
Does GMT observe Daylight Saving Time?
Yes, GMT observes Daylight Saving Time. During DST, clocks move forward by 1 hour to BST (UTC+1). The exact dates vary by country.
What is the UTC offset for GMT?
GMT has a UTC offset of UTC+0. During Daylight Saving Time, it shifts to BST with a UTC offset of UTC+1. The IANA time zone identifier is Europe/London.
What is GMT in military time?
In the military time zone system, GMT (UTC+0) is designated with a specific letter code. Military time zones use letters A through Z (excluding J) to represent offsets from UTC.