Loading...
Timezone abbreviation
Greenwich Mean Time is commonly shown as GMT and has an offset of UTC+00:00. GMT is commonly used as a reference timezone and is closely associated with Greenwich, London.
GMT is often used casually to mean UK local time, which can be wrong during British Summer Time.
When to use it
Use GMT for familiar zero-offset references, especially in UK-facing winter schedules. Use London time for meetings where local daylight saving matters.
Daylight saving
GMT itself does not move, but London local time changes to British Summer Time during daylight saving.
Avoid abbreviation mistakes
Timezone abbreviations are compact, but they are not always unique and they do not always describe daylight saving behavior. For exact meetings, choose a city and date in the converter. That lets the timezone database apply the correct local rules instead of relying on a fixed abbreviation.
Cities in GMT