GMT/BST
Greenwich Mean Time
GMT +0
BST automatically adjusted to GMT time zone, that is in use
GT
Guyana Time
GMT -3

Time Difference

Greenwich Mean Time is 3 hours and 45 minutes ahead of Guyana Time
4:30 am04:30 in GMT is 12:45 am00:45 in GT

BST to GT call time
Best time for a conference call or a meeting is between 12:45pm-6pm in BST which corresponds to 8am-1:15pm in GT

4:30 am04:30 Greenwich Mean Time (GMT). Offset UTC 0:00 hours
12:45 am00:45 Guyana Time (GT). Offset UTC -3:45 hours

4:30 am04:30 GMT / 12:45 am00:45 GT

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

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 Time Zone Geo Map
BST timezone map

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

Guyana Time

Offset: GT is 3 hours and 45 minutes behind Greenwich Mean Time (GMT) and is used in America

GT representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data
  • -0345 - basic
  • -03:45 - extended
Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers
  • -0345 - sign character (-) followed by a four digit time providing hours (03) and minutes (45) of the offset. Indicates three hour and forty-five minutes time differences to the west of the zero meridian.
GT Abbreviation: Several time zones share GT abbreviation and it could refer to these time zones
  • Galapagos Time - UTC -6
  • Guyana Time - UTC -3