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Time in the Gambia is given by a single time zone, denoted as Greenwich Mean Time (GMT; UTC+00:00).^[1]^[2] Adopted in 1918,^[3] the Gambia has never observed daylight saving time (DST).^[2]

IANA time zone database

In the IANA time zone database, the Gambia is given one zone in the file zone.tab – Africa/Banjul. "GM" refers to the country's ISO 3166-1 alpha-2 country code. Data for the Gambia directly from zone.tab of the IANA time zone database; columns marked with * are the columns from zone.tab itself:^[4]

c.c.*	coordinates*	TZ*	Comments	UTC offset	DST
GM	+1328−01639	Africa/Banjul		+00:00	+00:00

^ Gambia, The at The World Factbook. Central Intelligence Agency (CIA). Retrieved 15 September 2021. "time difference: UTC 0".
^ ^a ^b Gambia Time Zone. TimeTemperature.com. Retrieved 15 September 2021.
^ Howse, Derek (1997) "Greenwich Time and the Longitude: Official Millennium Edition". National Maritime Museum. Bloomsbury USA. p. 148. Retrieved 5 September 2021.
^ Africa at the tz database. Internet Assigned Numbers Authority (IANA). Retrieved 15 September 2021.