BST
British Summer Time
GMT +1
CHAST
Chatham Island Standard Time
GMT +12:45

Time Difference

British Summer Time is 11 hours and 45 minutes behind Chatham Island Standard Time
12:00 am00:00 in BST is 11:45 am11:45 in CHAST

BST to CHAST call time
Best time for a conference call or a meeting is between 7am-9am in BST which corresponds to 6:45pm-8:45pm in CHAST

12:00 am00:00 British Summer Time (BST). Offset UTC +1:00 hour
11:45 am11:45 Chatham Island Standard Time (CHAST). Offset UTC +12:45 hours

12:00 am00:00 BST / 11:45 am11:45 CHAST

BST CHAST
12am (midnight) 11:45 am
1am 12:45 pm
2am 1:45 pm
3am 2:45 pm
4am 3:45 pm
5am 4:45 pm
6am 5:45 pm
7am 6:45 pm
8am 7:45 pm
9am 8:45 pm
10am 9:45 pm
11am 10:45 pm
12pm (noon) 11:45 pm
1pm 12:45 am
2pm 1:45 am
3pm 2:45 am
4pm 3:45 am
5pm 4:45 am
6pm 5:45 am
7pm 6:45 am
8pm 7:45 am
9pm 8:45 am
10pm 9:45 am
11pm 10:45 am
0:00 11:45
1:00 12:45
2:00 13:45
3:00 14:45
4:00 15:45
5:00 16:45
6:00 17:45
7:00 18:45
8:00 19:45
9:00 20:45
10:00 21:45
11:00 22:45
12:00 23:45
13:00 0:45
14:00 1:45
15:00 2:45
16:00 3:45
17:00 4:45
18:00 5:45
19:00 6:45
20:00 7:45
21:00 8:45
22:00 9:45
23:00 10:45

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 31, 2024 at 1:00 am local time and clocks were set one hour forward to Sunday, March 31, 2024, 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 27, 2024 at 2:00 am local time and clocks are set one hour back to Sunday, October 27, 2024, 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

Chatham Island Standard Time

Offset: CHAST is 12 hours and 45 minutes ahead Greenwich Mean Time (GMT) and is used in Pacific

CHAST Time Zone Geo Map
CHAST timezone map

CHAST representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data
  • +1245 - basic
  • +12:45 - extended
Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers
  • +1245 - sign character (+) followed by a four digit time providing hours (12) and minutes (45) of the offset. Indicates twelve hour and forty-five minutes time differences to the east of the zero meridian.