Greenwich Mean Time
UTC offset: UTC+00:00
Region: Global reference
Example IANA zones: America/Danmarkshavn, Europe/Belfast, Europe/Dublin
GMT Time Zone
GMT is Greenwich Mean Time (UTC+00:00).
Definition
GMT is a time-zone abbreviation used in date/time schedules, travel, and software timestamps. Abbreviations can map to different regions and offsets, so they are less precise than IANA time zones.
For accurate conversion, use a specific zone like America/New_York or Europe/London instead of abbreviation-only input.
Offset and DST note
GMT itself does not shift. Some regions using GMT-related zones may switch to summer time labels.
Common offsets for GMT: UTC+00:00.
Meanings
Convert GMT
Related offset pages
Related IANA zones
America/DanmarkshavnEurope/BelfastEurope/DublinEurope/GuernseyEurope/Isle_of_ManEurope/JerseyEurope/LondonAfrica/AbidjanAfrica/AccraAfrica/BamakoAfrica/BanjulAfrica/BissauAfrica/ConakryAfrica/DakarAfrica/FreetownAfrica/LomeAfrica/MonroviaAfrica/NouakchottAfrica/OuagadougouAfrica/Sao_TomeAfrica/TimbuktuAtlantic/ReykjavikAtlantic/St_HelenaEire
Related abbreviations
Frequently asked questions
What does GMT mean?
GMT is Greenwich Mean Time (UTC+00:00).
Is GMT ambiguous?
GMT is commonly used for a single primary meaning, but always verify region context.
How do I convert GMT to my local time?
Use the Time Zone Converter and select a specific city or IANA zone to avoid abbreviation ambiguity.