BST to IST to EST
Time Difference
Greenwich Mean Time is 5 hours and 30 minutes behind India Standard Time and 5 hours ahead of Eastern Standard Time
11:30 am11:30 in GMT is 5:00 pm17:00 in IST and is 6:30 am06:30 in EST
BST to IST call time
Best time for a conference call or a meeting is between 8am-1:30pm in BST which corresponds to 12:30pm-6pm in IST
BST to EST call time
Best time for a conference call or a meeting is between 2pm-6pm in BST which corresponds to 8am-12pm in EST
11:30 am11:30 Greenwich Mean Time (GMT). Offset UTC 0:00 hours
5:00 pm17:00 India Standard Time (IST). Offset UTC +5:30 hours
6:30 am06:30 Eastern Standard Time (EST). Offset UTC -5:00 hours
11:30 am11:30 GMT / 5:00 pm17:00 IST / 6:30 am06:30 EST
| GMT | IST | EST |
|---|---|---|
| 12am (midnight) | 5:30 am | 7pm |
| 1am | 6:30 am | 8pm |
| 2am | 7:30 am | 9pm |
| 3am | 8:30 am | 10pm |
| 4am | 9:30 am | 11pm |
| 5am | 10:30 am | 12am (midnight) |
| 6am | 11:30 am | 1am |
| 7am | 12:30 pm | 2am |
| 8am | 1:30 pm | 3am |
| 9am | 2:30 pm | 4am |
| 10am | 3:30 pm | 5am |
| 11am | 4:30 pm | 6am |
| 12pm (noon) | 5:30 pm | 7am |
| 1pm | 6:30 pm | 8am |
| 2pm | 7:30 pm | 9am |
| 3pm | 8:30 pm | 10am |
| 4pm | 9:30 pm | 11am |
| 5pm | 10:30 pm | 12pm (noon) |
| 6pm | 11:30 pm | 1pm |
| 7pm | 12:30 am | 2pm |
| 8pm | 1:30 am | 3pm |
| 9pm | 2:30 am | 4pm |
| 10pm | 3:30 am | 5pm |
| 11pm | 4:30 am | 6pm |
| 0:00 | 5:30 | 19:00 |
| 1:00 | 6:30 | 20:00 |
| 2:00 | 7:30 | 21:00 |
| 3:00 | 8:30 | 22:00 |
| 4:00 | 9:30 | 23:00 |
| 5:00 | 10:30 | 0:00 |
| 6:00 | 11:30 | 1:00 |
| 7:00 | 12:30 | 2:00 |
| 8:00 | 13:30 | 3:00 |
| 9:00 | 14:30 | 4:00 |
| 10:00 | 15:30 | 5:00 |
| 11:00 | 16:30 | 6:00 |
| 12:00 | 17:30 | 7:00 |
| 13:00 | 18:30 | 8:00 |
| 14:00 | 19:30 | 9:00 |
| 15:00 | 20:30 | 10:00 |
| 16:00 | 21:30 | 11:00 |
| 17:00 | 22:30 | 12:00 |
| 18:00 | 23:30 | 13:00 |
| 19:00 | 0:30 | 14:00 |
| 20:00 | 1:30 | 15:00 |
| 21:00 | 2:30 | 16:00 |
| 22:00 | 3:30 | 17:00 |
| 23:00 | 4:30 | 18:00 |
British Summer Time
Offset: BST is 1 hour ahead Greenwich Mean Time (GMT) and is used in Europe
Countries: It is used in following countries: Britain (UK), Guernsey, Isle of Man, Jersey
Principal Cities: The largest city in the BST timezone is London from United Kingdom with population about 7.557 million people. Other major cities in the area are Birmingham, Glasgow, Liverpool, Saint Helier
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.
BST representations, usage and related time zones
- +01 - basic short
- +0100 - basic
- +01:00 - extended
- +0100 - sign character (+) followed by a four digit time providing hours (01) and minutes (00) of the offset. Indicates one hour and zero minutes time differences to the east of the zero meridian.
- Alpha - Military abbreviation for BST
- A - short form of 'Alpha'
- Europe/Belfast
- Europe/Guernsey
- Europe/Isle_of_Man
- Europe/Jersey
- Europe/London
- GB
- GB-Eire
- British Summer Time - UTC +1
- Bangladesh Standard Time - UTC +6
- Bougainville Standard Time - UTC +11
- Brasilia Standard Time - UTC -3
- BST - British Summer Time
- CET - Central European Time
- IST - Irish Standard Time
- WEST - Western European Summer Time
- A - Alpha Time Zone
- CET - Central European Time
- MEZ - Mitteleuropäische Zeit
- WAT - West Africa Time
- WST - Western Sahara Summer Time
- BMT - Biel Mean Time
India Standard Time
Offset: IST is 5 hours and 30 minutes ahead Greenwich Mean Time (GMT) and is used in Asia
Countries: It is used in following countries: India
Principal Cities: The largest city in the IST timezone is Mumbai from India with population about 12.692 million people. Other major cities in the area are Delhi, Bangalore, Kolkata, Chennai
Daylight Saving: India Standard Time (IST) is not adjusted for daylight saving therefore IST remains the same through out the year. This means, unlike some time zones where the clock is set forward by one hour every summer and backward by one hour during winter to adjust for daylight saving, India Standard Time remains the same
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 five hour and thirty minutes time differences 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
- Irkutsk Standard Time - UTC +8
Eastern Standard Time
Offset: EST is 5 hours behind Greenwich Mean Time (GMT) and is used in North America
Countries: It is used in following countries: Bahamas, Canada, Haiti, Jamaica, Cayman Islands, Mexico, Panama, Turks & Caicos Is, United States
Principal Cities: The largest city in the EST timezone is New York City from USA with population about 8.175 million people. Other major cities in the area are Toronto, Montreal, Brooklyn, Borough of Queens
French: HNE - Heure Normale de l'Est
Spanish: ET - Tiempo del Este, ET - Zona Sureste
Daylight Saving: This is a standard timezone, however during summer some places switch clocks for one hour forward when daylight saving comes into effect and observe Eastern Daylight Time (EDT).
Start: Eastern Standard Time (EST) started on Sunday, November 2, 2025 at 2:00 am local time and clocks were set one hour back to Sunday, November 2, 2025, 1:00 am. Standard time starts annually the on first Sunday of November.
End: Eastern Standard Time (EST) ends on Sunday, March 8, 2026 at 2:00 am local time and clocks are set one hour forward to Sunday, March 8, 2026, 3:00 am local daylight time instead. Standard time starts annually the on second Sunday of March.
EST representations, usage and related time zones
- -05 - basic short
- -0500 - basic
- -05:00 - extended
- -0500 - sign character (-) followed by a four digit time providing hours (05) and minutes (00) of the offset. Indicates five hour and zero minutes time differences to the west of the zero meridian.
- Romeo - Military abbreviation for EST
- R - short form of 'Romeo'
- America/Atikokan
- America/Cancun
- America/Cayman
- America/Coral_Harbour
- America/Detroit
- America/Fort_Wayne
- America/Grand_Turk
- America/Indiana/Indianapolis
- America/Indiana/Marengo
- America/Indiana/Petersburg
- America/Indiana/Vevay
- America/Indiana/Vincennes
- America/Indiana/Winamac
- America/Indianapolis
- America/Iqaluit
- America/Jamaica
- America/Kentucky/Louisville
- America/Kentucky/Monticello
- America/Louisville
- America/Montreal
- America/Nassau
- America/New_York
- America/Nipigon
- America/Panama
- America/Pangnirtung
- America/Port-au-Prince
- America/Thunder_Bay
- America/Toronto
- Canada/Eastern
- EST
- EST5EDT
- Jamaica
- US/East-Indiana
- US/Eastern
- US/Michigan
- CDT - Central Daylight Time
- EST - Eastern Standard Time
- ET - Eastern Time
- COT - Colombia Time
- CST - Cuba Standard Time
- EASST - Easter Island Summer Time
- ECT - Ecuador Time
- PET - Peru Time
- R - Romeo Time Zone