Tokyo to IST to GMT Time Converter
The United Kingdom is on summer time: BST (UTC+1) until Sun, Oct 25.
Iceland and Ghana stay on GMT (UTC+0).
Start by searching for a time zone, city, or town.
Add one or more places to compare local times, adjust the date, and share the result.
Quick answers
Selected conversion
9:00 pm21:00 JST (UTC+9), Oct 18, 2026 = 5:30 pm17:30 IST (UTC+5:30), Oct 18, 2026 = 12:00 pm12:00 GMT (UTC+0), Oct 18, 2026
Tokyo is 3 hours and 30 minutes ahead of IST. Tokyo is 9 hours ahead of GMT.
How the time difference changes
Tokyo to IST
Tokyo is 3 hours and 30 minutes ahead of IST year-round.
Working hours of 9:00 am to 6:00 pm in Tokyo correspond to 5:30 am to 2:30 pm in IST.Working hours of 09:00 to 18:00 in Tokyo correspond to 05:30 to 14:30 in IST.
Tokyo to GMT
Tokyo is 9 hours ahead of GMT year-round.
Working hours of 9:00 am to 6:00 pm in Tokyo correspond to 12:00 am to 9:00 am in GMT.Working hours of 09:00 to 18:00 in Tokyo correspond to 00:00 to 09:00 in GMT.
Compare Tokyo time with IST and GMT time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.
Time Difference
JST (Japan Standard Time) is 3 hours and 30 minutes ahead of India Standard Time. JST (Japan Standard Time) is 9 hours ahead of Greenwich Mean Time.
9:00 pm21:00 in Tokyo, Japan is 5:30 pm17:30 in IST and is 12:00 pm12:00 in GMT
Tokyo to IST call time
Best time for a conference call or a meeting is between 12:30pm-6pm12:30-18:00 in Tokyo which corresponds to 9am-2:30pm09:00-14:30 in IST
Tokyo to GMT call time
Best time for a conference call or a meeting is between 5:30pm-6:30pm17:30-18:30 in Tokyo which corresponds to 8:30am-9:30am08:30-09:30 in GMT. Their 9am–6pm09:00–18:00 working hours do not overlap; this is a suggested compromise.
9:00 pm21:00 JST (Japan Standard Time) (Tokyo, Japan). Offset UTC +9:00 hours
5:30 pm17:30 India Standard Time (IST). Offset UTC +5:30 hours
12:00 pm12:00 Greenwich Mean Time (GMT). Offset UTC 0:00 hours
9:00 pm21:00 Tokyo, Japan / 5:30 pm17:30 IST / 12:00 pm12:00 GMT
Choose an hour to update the converter. Day labels such as “next day” or “+1” are relative to the selected date in the first column. Use Up and Down arrow keys, Home or End to move between hours, then Enter or Space to select.
| Tokyo, Japan | IST | GMT |
|---|---|---|
| 8:30pm previous day | 3:00pm previous day | |
| 9:30pm previous day | 4:00pm previous day | |
| 10:30pm previous day | 5:00pm previous day | |
| 11:30pm previous day | 6:00pm previous day | |
| 12:30am | 7:00pm previous day | |
| 1:30am | 8:00pm previous day | |
| 2:30am | 9:00pm previous day | |
| 3:30am | 10:00pm previous day | |
| 4:30am | 11:00pm previous day | |
| 5:30am | 12:00am | |
| 6:30am | 1:00am | |
| 7:30am | 2:00am | |
| 8:30am | 3:00am | |
| 9:30am | 4:00am | |
| 10:30am | 5:00am | |
| 11:30am | 6:00am | |
| 12:30pm | 7:00am | |
| 1:30pm | 8:00am | |
| 2:30pm | 9:00am | |
| 3:30pm | 10:00am | |
| 4:30pm | 11:00am | |
| 5:30pm | 12:00pm | |
| 6:30pm | 1:00pm | |
| 7:30pm | 2:00pm | |
| 20:30 previous day | 15:00 previous day | |
| 21:30 previous day | 16:00 previous day | |
| 22:30 previous day | 17:00 previous day | |
| 23:30 previous day | 18:00 previous day | |
| 00:30 | 19:00 previous day | |
| 01:30 | 20:00 previous day | |
| 02:30 | 21:00 previous day | |
| 03:30 | 22:00 previous day | |
| 04:30 | 23:00 previous day | |
| 05:30 | 00:00 | |
| 06:30 | 01:00 | |
| 07:30 | 02:00 | |
| 08:30 | 03:00 | |
| 09:30 | 04:00 | |
| 10:30 | 05:00 | |
| 11:30 | 06:00 | |
| 12:30 | 07:00 | |
| 13:30 | 08:00 | |
| 14:30 | 09:00 | |
| 15:30 | 10:00 | |
| 16:30 | 11:00 | |
| 17:30 | 12:00 | |
| 18:30 | 13:00 | |
| 19:30 | 14:00 |
Tokyo Time Zone and Facts
Time Zone
Tokyo Facts
India Standard Time
Offset: IST is 5 hours and 30 minutes ahead of Greenwich Mean Time (GMT).
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, Bengaluru, Hyderabad, Ahmedabad.
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; see upcoming clock changes worldwide.
Current time in India: India time now
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
Greenwich Mean Time
Offset: GMT is the same as Greenwich Mean Time (GMT).
Countries using this time zone: Antarctica, Burkina Faso, Gambia, Ghana, Greenland, Guernsey, Guinea, Guinea-Bissau, Iceland, Ireland, Isle of Man, Ivory Coast, Jersey, Liberia, Mali, Mauritania, Morocco, Saint Helena, São Tomé and Príncipe, Senegal, Sierra Leone, Togo, United Kingdom, Western Sahara
Principal Cities: The largest city in the GMT time zone is London in the United Kingdom, with about 8.962 million people. Other major cities in this time zone include Abidjan, Bamako, Casablanca, Dakar.
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 the two are the same. In the military, GMT is known as Zulu time. Greenwich Mean Time was the same as Universal Time (UT), a standard astronomical concept used in many technical fields, until the introduction of UTC in 1972.
Today the lighter areas are on UTC+1 (British Summer Time, Irish Standard Time).
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 - Coordinated Universal Time
- WT - Western Sahara Standard Time
- Z - Zulu Time Zone