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BST to IST to UTC

BST
British Summer Time
GMT +1
IST
India Standard Time
GMT +5:30
UTC
Universal Time Coordinated
GMT +0

Time Difference

British Summer Time is 4 hours and 30 minutes behind India Standard Time and 1 hour ahead of Universal Time Coordinated
9:30 am09:30 in BST is 2:00 pm14:00 in IST and is 8:30 am08:30 in UTC

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 UTC call time
Best time for a conference call or a meeting is between 9am-6pm in BST which corresponds to 8am-5pm in UTC

9:30 am09:30 British Summer Time (BST). Offset UTC +1:00 hour
2:00 pm14:00 India Standard Time (IST). Offset UTC +5:30 hours
8:30 am08:30 Universal Time Coordinated (UTC). Offset UTC 0:00 hours

9:30 am09:30 BST / 2:00 pm14:00 IST / 8:30 am08:30 UTC

BST IST UTC
12am (midnight) 4:30 am 11pm
1am 5:30 am 12am (midnight)
2am 6:30 am 1am
3am 7:30 am 2am
4am 8:30 am 3am
5am 9:30 am 4am
6am 10:30 am 5am
7am 11:30 am 6am
8am 12:30 pm 7am
9am 1:30 pm 8am
10am 2:30 pm 9am
11am 3:30 pm 10am
12pm (noon) 4:30 pm 11am
1pm 5:30 pm 12pm (noon)
2pm 6:30 pm 1pm
3pm 7:30 pm 2pm
4pm 8:30 pm 3pm
5pm 9:30 pm 4pm
6pm 10:30 pm 5pm
7pm 11:30 pm 6pm
8pm 12:30 am 7pm
9pm 1:30 am 8pm
10pm 2:30 am 9pm
11pm 3:30 am 10pm
0:00 4:30 23:00
1:00 5:30 0:00
2:00 6:30 1:00
3:00 7:30 2:00
4:00 8:30 3:00
5:00 9:30 4:00
6:00 10:30 5:00
7:00 11:30 6:00
8:00 12:30 7:00
9:00 13:30 8:00
10:00 14:30 9:00
11:00 15:30 10:00
12:00 16:30 11:00
13:00 17:30 12:00
14:00 18:30 13:00
15:00 19:30 14:00
16:00 20:30 15:00
17:00 21:30 16:00
18:00 22:30 17:00
19:00 23:30 18:00
20:00 0:30 19:00
21:00 1:30 20:00
22:00 2:30 21:00
23:00 3:30 22:00

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

BST Time Zone Geo Map
BST timezone map

Daylight Saving: British Summer Time (BST) is a daylight saving/summer timezone, however during winter some places switch clocks for one hour back and observe Greenwich Mean Time (GMT).

Daylight saving time clock moves forward for one hour from 1am to 2amStart: British Summer Time (BST) started on Sunday, March 30, 2025 at 1:00 am local time and clocks were set one hour forward to Sunday, March 30, 2025, 2:00 am. Daylight saving starts annually the on last Sunday of March

Daylight saving time clock moves back for one hour from 2am to 1amEnd: British Summer Time (BST) ends on Sunday, October 26, 2025 at 2:00 am local time and clocks are set one hour back to Sunday, October 26, 2025, 1:00 am local standard time instead. Daylight saving ends annually the on last Sunday of October

BST representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data
  • +01 - basic short
  • +0100 - basic
  • +01:00 - extended
Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers
  • +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.
Military/NATO: Used by the U.S. military, Chinese military and others
  • Alpha - Military abbreviation for BST
  • A - short form of 'Alpha'
IANA/Olson: Reflects BST time zone boundaries defined by political bodies, primarily intended for use with computer programs and operating systems
  • Europe/Belfast
  • Europe/Guernsey
  • Europe/Isle_of_Man
  • Europe/Jersey
  • Europe/London
  • GB
  • GB-Eire
BST Abbreviation: Several time zones share BST abbreviation and it could refer to these time zones
  • British Summer Time - UTC +1
  • Bangladesh Standard Time - UTC +6
  • Bougainville Standard Time - UTC +11
  • Brasilia Standard Time - UTC -3
Time zones with the GMT +1 offset:
  • 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 Time Zone Geo Map
IST timezone map

IST representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data
  • +0530 - basic
  • +05:30 - extended
Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers
  • +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.
IANA/Olson: Reflects IST time zone boundaries defined by political bodies, primarily intended for use with computer programs and operating systems
  • Asia/Calcutta
  • Asia/Kolkata
IST Abbreviation: Several time zones share IST abbreviation and it could refer to these time zones
  • India Standard Time - UTC +5:30
  • Irish Standard Time - UTC +1
  • Israel Standard Time - UTC +2
  • Iran Standard Time - UTC +3:30

Universal Time Coordinated

Offset: UTC is 0 hours ahead Greenwich Mean Time (GMT) and is used in Universal

Coordinated Universal Time (UTC) is the world time standard that regulates clocks and time. It is successor to Greenwich Mean Time (GMT). For casual use, UTC is the same as GMT, but is used by the scientific community.
UTC is the time standard commonly used across the world since 1972. It is used in many technical fields, like aviation industry and meteorologists, also used to synchronize time across internet networks.

UTC representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data
  • Z - is the zone designator for the zero UTC/GMT offset, also known as 'Zulu' time
  • +00 - basic short
  • +0000 - basic
  • +00:00 - extended
Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers
  • +0000 - sign character (+) followed by a four digit time providing hours (00) and minutes (00) of the offset. Indicates zero hour and zero minutes time differences of the zero meridian.
Military/NATO: Used by the U.S. military, Chinese military and others
  • Zulu - Military abbreviation for UTC
  • Z - short form of 'Zulu'
IANA/Olson: Reflects UTC time zone boundaries defined by political bodies, primarily intended for use with computer programs and operating systems
  • Etc/UCT
  • Etc/UTC
  • Etc/Universal
  • Etc/Zulu
  • UCT
  • UTC
  • Universal
  • Zulu
Time zones with the GMT +0 offset:
  • 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
EST to IST GMT to EST PST to EST EST to GMT PST to GMT