Aikavyöhyke
- Greenwich Mean Time (GMT), UTC +0
- No daylight saving time, same UTC offset all year
The IANA time zone identifiers for Greenwich Mean Time are GMT, Africa/Abidjan, Africa/Accra, Africa/Bamako, Africa/Banjul, Africa/Bissau, Africa/Conakry, Africa/Dakar, Africa/Freetown, Africa/Lome, Africa/Monrovia, Africa/Nouakchott, Africa/Ouagadougou, America/Danmarkshavn, Atlantic/Reykjavik ja Atlantic/St_Helena.