GMT: Greenwich Mean Time
GMT stands for Greenwich Mean Time. It is UTC+0, the same as UTC.
GMT is the UK's winter time. From the last Sunday in March to the last Sunday in October the UK is on BST (UTC+1), so a London time written as GMT in summer is an hour off.
Iceland, Ghana and Senegal use GMT all year. For everyday purposes GMT and UTC show the same time.
GMT UTC+0
Daylight saving time and GMT
Places on GMT that use daylight saving time switch to BST (UTC+1) in summer, so writing "GMT" during the summer is a common mistake.
Where GMT is used
| City | When | Right now |
|---|---|---|
| London United Kingdom | Standard time (winter) | |
| Dublin Ireland | Standard time (winter) | |
| Reykjavik Iceland | All year | |
| Accra Ghana | All year |
Convert GMT to other time zones
GMT is a fixed offset, so these conversions are the same on every date. Use the last column to convert any time.
| Time zone | 09:00 GMT | 12:00 GMT | 17:00 GMT | |
|---|---|---|---|---|
| Your local time | ||||
| UTC Coordinated Universal Time · UTC+0 | 09:00 | 12:00 | 17:00 | |
| HST Hawaii Standard Time · UTC−10 | 23:00 −1 day | 02:00 | 07:00 | |
| PST Pacific Standard Time · UTC−8 | 01:00 | 04:00 | 09:00 | |
| MST Mountain Standard Time · UTC−7 | 02:00 | 05:00 | 10:00 | |
| CST Central Standard Time · UTC−6 | 03:00 | 06:00 | 11:00 | |
| EST Eastern Standard Time · UTC−5 | 04:00 | 07:00 | 12:00 | |
| BRT Brasília Time · UTC−3 | 06:00 | 09:00 | 14:00 | |
| CET Central European Time · UTC+1 | 10:00 | 13:00 | 18:00 | |
| EET Eastern European Time · UTC+2 | 11:00 | 14:00 | 19:00 | |
| GST Gulf Standard Time · UTC+4 | 13:00 | 16:00 | 21:00 | |
| IST India Standard Time · UTC+5:30 | 14:30 | 17:30 | 22:30 | |
| ICT Indochina Time · UTC+7 | 16:00 | 19:00 | 00:00 +1 day | |
| CST China Standard Time · UTC+8 | 17:00 | 20:00 | 01:00 +1 day | |
| JST Japan Standard Time · UTC+9 | 18:00 | 21:00 | 02:00 +1 day | |
| KST Korea Standard Time · UTC+9 | 18:00 | 21:00 | 02:00 +1 day | |
| AEST Australian Eastern Standard Time · UTC+10 | 19:00 | 22:00 | 03:00 +1 day | |
| NZST New Zealand Standard Time · UTC+12 | 21:00 | 00:00 +1 day | 05:00 +1 day |
Frequently asked questions
What does GMT stand for?
GMT stands for Greenwich Mean Time. It is UTC+0, the same as UTC.
How do I convert GMT to UTC?
GMT is the same as UTC, so no conversion is needed.
Is GMT the same as BST?
No. GMT is UTC+0 and BST is UTC+1. BST is the summer time of places that use GMT in winter. Using the wrong one puts a meeting off by an hour.
Which cities use GMT?
London, Dublin, Reykjavik, Accra use GMT.
Other time zone abbreviations
Why abbreviations cause mistakes, and safer ways to write a time: EST, CST, IST: why time zone abbreviations confuse.