GMT to IST to London, United Kingdom
Compare GMT time with IST and London time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.
Time Difference
Greenwich Mean Time is 5 hours and 30 minutes behind India Standard Time and 0 hours ahead of GMT (Greenwich Mean Time)
12:00 pm12:00 in GMT is 5:30 pm17:30 in IST and is 12:00 pm12:00 in London, United Kingdom
GMT to IST call time
Best time for a conference call or a meeting is between 9am-11:30am in GMT which corresponds to 2:30pm-5pm in IST
GMT to London call time
Best time for a conference call or a meeting is between 9am-5pm in GMT which corresponds to 9am-5pm in London
12:00 pm12:00 Greenwich Mean Time (GMT). Offset UTC 0:00 hours
5:30 pm17:30 India Standard Time (IST). Offset UTC +5:30 hours
12:00 pm12:00 GMT (Greenwich Mean Time) (London, United Kingdom). Offset UTC 0:00 hours
12:00 pm12:00 GMT / 5:30 pm17:30 IST / 12:00 pm12:00 London, United Kingdom
| GMT | IST | London, United Kingdom |
|---|---|---|
| 12am (midnight) | 5:30 am | 12am (midnight) |
| 1am | 6:30 am | 1am |
| 2am | 7:30 am | 2am |
| 3am | 8:30 am | 3am |
| 4am | 9:30 am | 4am |
| 5am | 10:30 am | 5am |
| 6am | 11:30 am | 6am |
| 7am | 12:30 pm | 7am |
| 8am | 1:30 pm | 8am |
| 9am | 2:30 pm | 9am |
| 10am | 3:30 pm | 10am |
| 11am | 4:30 pm | 11am |
| 12pm (noon) | 5:30 pm | 12pm (noon) |
| 1pm | 6:30 pm | 1pm |
| 2pm | 7:30 pm | 2pm |
| 3pm | 8:30 pm | 3pm |
| 4pm | 9:30 pm | 4pm |
| 5pm | 10:30 pm | 5pm |
| 6pm | 11:30 pm | 6pm |
| 7pm | 12:30 am | 7pm |
| 8pm | 1:30 am | 8pm |
| 9pm | 2:30 am | 9pm |
| 10pm | 3:30 am | 10pm |
| 11pm | 4:30 am | 11pm |
| 00:00 | 05:30 | 00:00 |
| 01:00 | 06:30 | 01:00 |
| 02:00 | 07:30 | 02:00 |
| 03:00 | 08:30 | 03:00 |
| 04:00 | 09:30 | 04:00 |
| 05:00 | 10:30 | 05:00 |
| 06:00 | 11:30 | 06:00 |
| 07:00 | 12:30 | 07:00 |
| 08:00 | 13:30 | 08:00 |
| 09:00 | 14:30 | 09:00 |
| 10:00 | 15:30 | 10:00 |
| 11:00 | 16:30 | 11:00 |
| 12:00 | 17:30 | 12:00 |
| 13:00 | 18:30 | 13:00 |
| 14:00 | 19:30 | 14:00 |
| 15:00 | 20:30 | 15:00 |
| 16:00 | 21:30 | 16:00 |
| 17:00 | 22:30 | 17:00 |
| 18:00 | 23:30 | 18:00 |
| 19:00 | 00:30 | 19:00 |
| 20:00 | 01:30 | 20:00 |
| 21:00 | 02:30 | 21:00 |
| 22:00 | 03:30 | 22:00 |
| 23:00 | 04:30 | 23:00 |
Greenwich Mean Time
Offset: GMT is 0 hours ahead Greenwich Mean Time (GMT) and is used in Europe
Countries using this time zone: Burkina Faso, Côte d'Ivoire, Britain (UK), Guernsey, Ghana, Greenland, Gambia, Guinea, Guinea-Bissau, Ireland, Isle of Man, Iceland, Jersey, Liberia, Mali, Mauritania, St Helena, Sierra Leone, Senegal, Sao Tome & Principe, Togo
Principal Cities: The largest city in the GMT time zone is London in United Kingdom, with about 7.557 million people. Other major cities in this time zone include Abidjan, Dakar, Grand Dakar, Accra.
Greenwich Mean Time (GMT) originally referred to the mean solar time at the Royal Observatory in Greenwich, London. It is now often used to refer to Coordinated Universal Time (UTC) when this is viewed as a time zone, and in casual use for the most parts it is the same. In military GMT is known as Zulu time.Greenwich Mean Time was the same as Universal Time (UT), until the introduction of UTC in 1972 a standard astronomical concept used in many technical fields.
GMT representations, usage and related time zones
- Z - is the zone designator for the zero UTC/GMT offset, also known as 'Zulu' time
- +00 - basic short
- +0000 - basic
- +00:00 - extended
- +0000 - sign character (+) followed by a four digit time providing hours (00) and minutes (00) of the offset. Indicates the zero UTC/GMT offset.
- Zulu - Military abbreviation for GMT
- Z - short form of 'Zulu'
- Africa/Abidjan
- Africa/Accra
- Africa/Bamako
- Africa/Banjul
- Africa/Bissau
- Africa/Conakry
- Africa/Dakar
- Africa/Freetown
- Africa/Lome
- Africa/Monrovia
- Africa/Nouakchott
- Africa/Ouagadougou
- Africa/Sao_Tome
- Africa/Timbuktu
- America/Danmarkshavn
- Atlantic/Reykjavik
- Atlantic/St_Helena
- Eire
- Etc/GMT
- Etc/GMT+0
- Etc/GMT-0
- Etc/GMT0
- Etc/Greenwich
- Europe/Belfast
- Europe/Dublin
- Europe/Guernsey
- Europe/Isle_of_Man
- Europe/Jersey
- Europe/London
- GB
- GB-Eire
- GMT
- GMT+0
- GMT-0
- GMT0
- Greenwich
- Iceland
- EGST - Eastern Greenland Summer Time
- GMT - Greenwich Mean Time
- WET - Western European Time
- AZOST - Azores Summer Time
- UTC - Universal Time Coordinated
- WT - Western Sahara Standard Time
- Z - Zulu Time Zone
India Standard Time
Offset: IST is 5 hours and 30 minutes ahead Greenwich Mean Time (GMT) and is used in Asia
Countries using this time zone: India
Principal Cities: The largest city in the IST time zone is Mumbai in India, with about 12.692 million people. Other major cities in this time zone include Delhi, Bangalore, Kolkata, Chennai.
Daylight Saving: Clocks in India Standard Time (IST) do not change for daylight saving time, so IST stays the same throughout the year. Other time zones may set clocks forward in summer and back in winter.
IST representations, usage and related time zones
- +0530 - basic
- +05:30 - extended
- +0530 - sign character (+) followed by a four digit time providing hours (05) and minutes (30) of the offset. Indicates an offset of five hours and thirty minutes to the east of the zero meridian.
- Asia/Calcutta
- Asia/Kolkata
- India Standard Time - UTC +5:30
- Irish Standard Time - UTC +1
- Israel Standard Time - UTC +2
London Information
Time Zone
GMT - Greenwich Mean Time
+0:00 hours during Greenwich Mean Time.
Sunday, March 29, 2026 at 1:00 am local time. DST starts annually on the last Sunday of March. Clocks are turned forward 1 hour to Sunday, March 29, 2026 at 2:00 am local daylight time instead. Also called Spring Forward or Summer Time.
Sunday, October 25, 2026 at 2:00 am local time. DST ends annually on the last Sunday of October. Clocks are turned backward 1 hour to Sunday, October 25, 2026 at 1:00 am local standard time instead. Also called Fall Back or switch to Winter Time.