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GMT
Greenwich Mean Time
GMT 0:00 h
IST
India Standard Time
GMT +5:30 h

Time Difference

Greenwich Mean Time is 5 hours and 30 minutes behind of India Standard Time
So 9:20 PM21:20 in GMT is 2:50 AM02:50 in IST

9:20 PM21:20 Greenwich Mean Time (GMT). Offset UTC 0:00 hours
2:50 AM02:50 India Standard Time (IST). Offset UTC +5:30 hours

9:20 PM21:20 GMT / 2:50 AM02:50 IST

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

Greenwich Mean Time

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

Countries: It is used in following countries: Burkina Faso, Cote 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 timezone is London from United Kingdom with population about 7.557 million people. Other major cities in the area are 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 Time Zone Geo Map
GMT timezone map
GMT 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 GMT
  • Z - short form of 'Zulu'

IANA/Olson: Reflects GMT time zone boundaries defined by political bodies, primarily intended for use with computer programs and operating systems
  • 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
  • Europe/Belfast
  • Europe/Dublin
  • Europe/Guernsey
  • Europe/Isle_of_Man
  • Europe/Jersey
  • Europe/London
  • GB
  • GB-Eire
  • GMT
  • Iceland

GMT Abbreviation: Several time zones share GMT abbreviation and it could refer to these time zones

  • Greenwich Mean Time - UTC 0:00 h
  • - UTC 0:00 h

Time zones with the GMT 0:00 h 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
  • WET -
  • GMT -


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, Sri Lanka

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/Colombo
  • Asia/Kolkata

IST Abbreviation: Several time zones share IST abbreviation and it could refer to these time zones

  • India Standard Time - UTC +5:30 h
  • Irish Standard Time - UTC +1:00 h
  • Israel Standard Time - UTC +2:00 h