PT/PDT
UTC−7
Mon, Oct 4
12am
3am
6am
9am
12pm
3pm
6pm
9pm
ET/EDT
UTC−4
Mon, Oct 4
3h ahead
12am
3am
6am
9am
12pm
3pm
6pm
9pm
GST
UTC+4
Tue, Oct 5 (next day)
11h ahead
12am
3am
6am
9am
12pm
3pm
6pm
9pm
EEST
UTC+3
Mon, Oct 4
10h ahead
12am
3am
6am
9am
12pm
3pm
6pm
9pm
CEST/CET
UTC+2
Mon, Oct 4
9h ahead
12am
3am
6am
9am
12pm
3pm
6pm
9pm
Central Europe is on summer time: CEST (UTC+2) until Sun, Oct 31.
BST
UTC+1
Mon, Oct 4
8h ahead
12am
3am
6am
9am
12pm
3pm
6pm
9pm

Quick answers

Selected conversion

1:00 pm13:00 PDT (UTC-7), Oct 4, 2021 = 4:00 pm16:00 EDT (UTC-4), Oct 4, 2021 = 12:00 am00:00 GST (UTC+4), Oct 5, 2021 = 11:00 pm23:00 EEST (UTC+3), Oct 4, 2021 = 10:00 pm22:00 CEST (UTC+2), Oct 4, 2021 = 9:00 pm21:00 BST (UTC+1), Oct 4, 2021

PDT is 3 hours behind EDT. PDT is 11 hours behind GST. PDT is 10 hours behind EEST. PDT is 9 hours behind CEST. PDT is 8 hours behind BST.

How the time difference changes

PT to ET

Normally, PT is 3 hours behind ET. Briefly around seasonal clock changes, PT is 2 hours behind ET or PT is 4 hours behind ET.

Typically, working hours of 9:00 am to 6:00 pm in PT correspond to 12:00 pm to 9:00 pm in ET.Typically, working hours of 09:00 to 18:00 in PT correspond to 12:00 to 21:00 in ET.

PT to GST

For most of the year, PT is 11 hours behind GST. From Nov 1, 2026 to Mar 14, 2027, PT is 12 hours behind GST.

For most of the year, working hours of 9:00 am to 6:00 pm in PT correspond to 8:00 pm to 5:00 am (next day) in GST. At other times of the year, working hours of 9:00 am to 6:00 pm in PT correspond to 9:00 pm to 6:00 am (next day) in GST.For most of the year, working hours of 09:00 to 18:00 in PT correspond to 20:00 to 05:00 (next day) in GST. At other times of the year, working hours of 09:00 to 18:00 in PT correspond to 21:00 to 06:00 (next day) in GST.

PT to EEST

For most of the year, PT is 10 hours behind EEST. From Oct 25 to Nov 1, 2026, and from Mar 14 to Mar 28, 2027, PT is 9 hours behind EET. From Nov 1, 2026 to Mar 14, 2027, PT is 10 hours behind EET.

For most of the year, working hours of 9:00 am to 6:00 pm in PT correspond to 7:00 pm to 4:00 am (next day) in EEST. At other times of the year, working hours of 9:00 am to 6:00 pm in PT correspond to 7:00 pm to 4:00 am (next day) in EET or working hours of 9:00 am to 6:00 pm in PT correspond to 6:00 pm to 3:00 am (next day) in EET.For most of the year, working hours of 09:00 to 18:00 in PT correspond to 19:00 to 04:00 (next day) in EEST. At other times of the year, working hours of 09:00 to 18:00 in PT correspond to 19:00 to 04:00 (next day) in EET or working hours of 09:00 to 18:00 in PT correspond to 18:00 to 03:00 (next day) in EET.

PT to CET

For most of the year, PT is 9 hours behind CEST. From Oct 25 to Nov 1, 2026, and from Mar 14 to Mar 28, 2027, PT is 8 hours behind CET. From Nov 1, 2026 to Mar 14, 2027, PT is 9 hours behind CET.

For most of the year, working hours of 9:00 am to 6:00 pm in PT correspond to 6:00 pm to 3:00 am (next day) in CEST. At other times of the year, working hours of 9:00 am to 6:00 pm in PT correspond to 6:00 pm to 3:00 am (next day) in CET or working hours of 9:00 am to 6:00 pm in PT correspond to 5:00 pm to 2:00 am (next day) in CET.For most of the year, working hours of 09:00 to 18:00 in PT correspond to 18:00 to 03:00 (next day) in CEST. At other times of the year, working hours of 09:00 to 18:00 in PT correspond to 18:00 to 03:00 (next day) in CET or working hours of 09:00 to 18:00 in PT correspond to 17:00 to 02:00 (next day) in CET.

PT to BST

For most of the year, PT is 8 hours behind BST. From Oct 25 to Nov 1, 2026, and from Mar 14 to Mar 28, 2027, PT is 7 hours behind GMT. From Nov 1, 2026 to Mar 14, 2027, PT is 8 hours behind GMT.

For most of the year, working hours of 9:00 am to 6:00 pm in PT correspond to 5:00 pm to 2:00 am (next day) in BST. At other times of the year, working hours of 9:00 am to 6:00 pm in PT correspond to 5:00 pm to 2:00 am (next day) in GMT or working hours of 9:00 am to 6:00 pm in PT correspond to 4:00 pm to 1:00 am (next day) in GMT.For most of the year, working hours of 09:00 to 18:00 in PT correspond to 17:00 to 02:00 (next day) in BST. At other times of the year, working hours of 09:00 to 18:00 in PT correspond to 17:00 to 02:00 (next day) in GMT or working hours of 09:00 to 18:00 in PT correspond to 16:00 to 01:00 (next day) in GMT.

Compare PT time with ET, GST, EEST, CET, and BST time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.

Time Difference

Pacific Daylight Time is 3 hours behind Eastern Daylight Time. Pacific Daylight Time is 11 hours behind Gulf Standard Time. Pacific Daylight Time is 10 hours behind Eastern European Summer Time. Pacific Daylight Time is 9 hours behind Central European Summer Time. Pacific Daylight Time is 8 hours behind British Summer Time.
1:00 pm13:00 in PDT is 4:00 pm16:00 in EDT and is 12:00 am00:00 in GST and is 11:00 pm23:00 in EEST and is 10:00 pm22:00 in CEST and is 9:00 pm21:00 in BST

PDT to EDT call time
Best time for a conference call or a meeting is between 9am-3pm09:00-15:00 in PDT which corresponds to 12pm-6pm12:00-18:00 in EDT
PDT to GST call time
Best time for a conference call or a meeting is between 7:30am-8:30am07:30-08:30 in PDT which corresponds to 6:30pm-7:30pm18:30-19:30 in GST. Their 9am–6pm09:00–18:00 working hours do not overlap; this is a suggested compromise.
PDT to EEST call time
Best time for a conference call or a meeting is between 8am-9am08:00-09:00 in PDT which corresponds to 6pm-7pm18:00-19:00 in EEST. Their 9am–6pm09:00–18:00 working hours do not overlap; this is a suggested compromise.
PDT to CEST call time
Best time for a conference call or a meeting is between 8:30am-9:30am08:30-09:30 in PDT which corresponds to 5:30pm-6:30pm17:30-18:30 in CEST. Their 9am–6pm09:00–18:00 working hours do not overlap; this is a suggested compromise.
PDT to BST call time
Best time for a conference call or a meeting is between 9am-10am09:00-10:00 in PDT which corresponds to 5pm-6pm17:00-18:00 in BST

1:00 pm13:00 Pacific Daylight Time (PDT). Offset UTC -7:00 hours
4:00 pm16:00 Eastern Daylight Time (EDT). Offset UTC -4:00 hours
12:00 am00:00 Gulf Standard Time (GST). Offset UTC +4:00 hours
11:00 pm23:00 Eastern European Summer Time (EEST). Offset UTC +3:00 hours
10:00 pm22:00 Central European Summer Time (CEST). Offset UTC +2:00 hours
9:00 pm21:00 British Summer Time (BST). Offset UTC +1:00 hour

1:00 pm13:00 PDT / 4:00 pm16:00 EDT / 12:00 am00:00 GST / 11:00 pm23:00 EEST / 10:00 pm22:00 CEST / 9:00 pm21:00 BST

Choose an hour to update the converter. Day labels such as “next day” or “+1” are relative to the selected date in the first column. Use Up and Down arrow keys, Home or End to move between hours, then Enter or Space to select.

Hourly time comparison
PTETGSTEESTCESTBST
3:00am11:00am10:00am9:00am8:00am
4:00am12:00pm11:00am10:00am9:00am
5:00am1:00pm12:00pm11:00am10:00am
6:00am2:00pm1:00pm12:00pm11:00am
7:00am3:00pm2:00pm1:00pm12:00pm
8:00am4:00pm3:00pm2:00pm1:00pm
9:00am5:00pm4:00pm3:00pm2:00pm
10:00am6:00pm5:00pm4:00pm3:00pm
11:00am7:00pm6:00pm5:00pm4:00pm
12:00pm8:00pm7:00pm6:00pm5:00pm
1:00pm9:00pm8:00pm7:00pm6:00pm
2:00pm10:00pm9:00pm8:00pm7:00pm
3:00pm11:00pm10:00pm9:00pm8:00pm
4:00pm12:00am next day11:00pm10:00pm9:00pm
5:00pm1:00am next day12:00am next day11:00pm10:00pm
6:00pm2:00am next day1:00am next day12:00am next day11:00pm
7:00pm3:00am next day2:00am next day1:00am next day12:00am next day
8:00pm4:00am next day3:00am next day2:00am next day1:00am next day
9:00pm5:00am next day4:00am next day3:00am next day2:00am next day
10:00pm6:00am next day5:00am next day4:00am next day3:00am next day
11:00pm7:00am next day6:00am next day5:00am next day4:00am next day
12:00am next day8:00am next day7:00am next day6:00am next day5:00am next day
1:00am next day9:00am next day8:00am next day7:00am next day6:00am next day
2:00am next day10:00am next day9:00am next day8:00am next day7:00am next day
03:0011:0010:0009:0008:00
04:0012:0011:0010:0009:00
05:0013:0012:0011:0010:00
06:0014:0013:0012:0011:00
07:0015:0014:0013:0012:00
08:0016:0015:0014:0013:00
09:0017:0016:0015:0014:00
10:0018:0017:0016:0015:00
11:0019:0018:0017:0016:00
12:0020:0019:0018:0017:00
13:0021:0020:0019:0018:00
14:0022:0021:0020:0019:00
15:0023:0022:0021:0020:00
16:0000:00 next day23:0022:0021:00
17:0001:00 next day00:00 next day23:0022:00
18:0002:00 next day01:00 next day00:00 next day23:00
19:0003:00 next day02:00 next day01:00 next day00:00 next day
20:0004:00 next day03:00 next day02:00 next day01:00 next day
21:0005:00 next day04:00 next day03:00 next day02:00 next day
22:0006:00 next day05:00 next day04:00 next day03:00 next day
23:0007:00 next day06:00 next day05:00 next day04:00 next day
00:00 next day08:00 next day07:00 next day06:00 next day05:00 next day
01:00 next day09:00 next day08:00 next day07:00 next day06:00 next day
02:00 next day10:00 next day09:00 next day08:00 next day07:00 next day

Pacific Time

Pacific Time (PT) is a general term used to describe the areas that observe either the Pacific Standard Time (PST) or Pacific Daylight Time (PDT) in the United States and Canada. PT also called Pacific Coast Time. PT is not static but switches between PDT and PST.

Territories observing the Pacific Time Zone are primarily in North America. It runs through the western part of Canada, the United States and the Northwestern part of Mexico.

Countries using this time zone: Canada, Mexico, United States.

Principal Cities: The largest city in the PT time zone is Los Angeles in the United States, with about 3.821 million people. Other major cities in this time zone include Tijuana, San Diego, Mexicali, San Jose.

French: HNP - Heure Normale du Pacifique

Spanish: PT - Tiempo del Pacífico, PT - Zona Noroeste

PT representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data
  • -08 - basic short
  • -0800 - basic
  • -08:00 - extended
Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers
  • -0800 - sign character (-) followed by a four digit time providing hours (08) and minutes (00) of the offset. Indicates an offset of eight hours to the west of the zero meridian.
Military/NATO: Used by the U.S. military, Chinese military and others
  • Uniform - Military abbreviation for PT
  • U - short form of 'Uniform'
Time zones with the GMT -8 offset:
  • AKDT - Alaska Daylight Time
  • PST - Pacific Standard Time
  • PT - Pacific Time
  • PST - Pitcairn Standard Time
  • U - Uniform Time Zone

Eastern Time

Eastern Time (ET) is a general term used to describe the areas that observe either the Eastern Standard Time (EST) or Eastern Daylight Time (EDT) in the United States and Canada. ET is not static but switches between EDT and EST.

ET is also used somewhat as a de facto official time for all of the United States because it encompasses 17 U.S. states in the eastern part of the contiguous United States including the capital city Washington D.C., the most populous city New York and half of the country’s population.

In the United States nationally televised programs, evening newscasts, talent and awards shows, and any other nationally televised event that airs live on American television during prime time and on the weekends are broadcast live in the Eastern Time Zone. Major professional sports leagues MLB, NBA, NFL and NHL also provide their game times in Eastern Time, even if teams are from outside of Eastern Time.

Countries using this time zone: Bahamas, Canada, Haiti, Jamaica, Cayman Islands, Mexico, Panama, Turks & Caicos Is, United States.

Principal Cities: The largest city in the ET time zone is New York City in the United States, with about 8.804 million people. Other major cities in this time zone include Toronto, Montréal, Philadelphia, Port-au-Prince.

French: HNE - Heure Normale de l'Est

Spanish: ET - Tiempo del Este, ET - Zona Sureste

Map of the areas on Eastern Time (ET)
ET all year ET part of the year

On October 4, 2021 the lighter areas are on UTC−5 (Central Daylight Time, EST).

ET representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data
  • -05 - basic short
  • -0500 - basic
  • -05:00 - extended
Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers
  • -0500 - sign character (-) followed by a four digit time providing hours (05) and minutes (00) of the offset. Indicates an offset of five hours to the west of the zero meridian.
Military/NATO: Used by the U.S. military, Chinese military and others
  • Romeo - Military abbreviation for ET
  • R - short form of 'Romeo'
ET Abbreviation: Several time zones share ET abbreviation and it could refer to these time zones
  • Eastern Time - UTC -5
  • Tiempo del Este - UTC -5
Time zones with the GMT -5 offset:
  • 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

Gulf Standard Time

Offset: GST is 4 hours ahead of Greenwich Mean Time (GMT).

Countries using this time zone: United Arab Emirates

Principal Cities: The largest city in the GST time zone is Dubai in the United Arab Emirates, with about 3.79 million people. Other major cities in this time zone include Abu Dhabi, Sharjah, Al Ain City, Ajman.

Daylight Saving: Clocks in Gulf Standard Time (GST) do not change for daylight saving time, so GST stays the same throughout the year. Other time zones may set clocks forward in summer and back in winter; see upcoming clock changes worldwide.

GST representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data
  • +04 - basic short
  • +0400 - basic
  • +04:00 - extended
Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers
  • +0400 - sign character (+) followed by a four digit time providing hours (04) and minutes (00) of the offset. Indicates an offset of four hours to the east of the zero meridian.
Military/NATO: Used by the U.S. military, Chinese military and others
  • Delta - Military abbreviation for GST
  • D - short form of 'Delta'
Time zones with the GMT +4 offset:
  • KUYT - Kuybyshev Time
  • MSD - Moscow Daylight Time
  • SAMT - Samara Time
  • AMT - Armenia Time
  • AZT - Azerbaijan Time
  • D - Delta Time Zone
  • GET - Georgia Standard Time
  • GST - Gulf Standard Time
  • MUT - Mauritius Time
  • RET - Reunion Time
  • SCT - Seychelles Time

Eastern European Summer Time

Offset: EEST is 3 hours ahead of Greenwich Mean Time (GMT).

Countries using this time zone: Åland Islands, Bulgaria, Cyprus, Estonia, Egypt, Finland, Greece, Lebanon, Lithuania, Latvia, Moldova, Palestine, Romania, Ukraine

Principal Cities: The largest city in the EEST time zone is Cairo in Egypt, with about 9.607 million people. Other major cities in this time zone include Alexandria, Giza, Kyiv, Beirut.

German: OESZ - Osteuropäische Sommerzeit

Map of the areas on Eastern European Summer Time (EEST)
EEST part of the year

On October 4, 2021 some of the shaded areas are on UTC+2 (EET).

Daylight Saving: Eastern European Summer Time (EEST) is a daylight saving/summer time zone. During winter, some places set clocks back one hour and observe Eastern European Time (EET).

123456789101112Start: Eastern European Summer Time (EEST) started on Sunday, March 28, 2021 at 3:00 am03:00 local time and clocks were set one hour forward to Sunday, March 28, 2021, 4:00 am04:00. Daylight saving starts annually on the last Sunday of March.

123456789101112End: Eastern European Summer Time (EEST) ends on Sunday, October 31, 2021 at 4:00 am04:00 local time and clocks are set one hour back to Sunday, October 31, 2021, 3:00 am03:00 local standard time instead. Daylight saving ends annually on the last Sunday of October.

See upcoming clock changes worldwide.

EEST representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data
  • +03 - basic short
  • +0300 - basic
  • +03:00 - extended
Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers
  • +0300 - sign character (+) followed by a four digit time providing hours (03) and minutes (00) of the offset. Indicates an offset of three hours to the east of the zero meridian.
Military/NATO: Used by the U.S. military, Chinese military and others
  • Charlie - Military abbreviation for EEST
  • C - short form of 'Charlie'
IANA/Olson: Reflects EEST time zone boundaries defined by political bodies, primarily intended for use with computer programs and operating systems
  • Africa/Cairo
  • Asia/Beirut
  • Asia/Famagusta
  • Asia/Gaza
  • Asia/Hebron
  • Asia/Nicosia
  • EET
  • Egypt
  • Europe/Athens
  • Europe/Bucharest
  • Europe/Chisinau
  • Europe/Helsinki
  • Europe/Kiev
  • Europe/Kyiv
  • Europe/Mariehamn
  • Europe/Nicosia
  • Europe/Riga
  • Europe/Sofia
  • Europe/Tallinn
  • Europe/Tiraspol
  • Europe/Uzhgorod
  • Europe/Vilnius
  • Europe/Zaporozhye
Time zones with the GMT +3 offset:
  • EEST - Eastern European Summer Time
  • MSK - Moscow Standard Time
  • AST - Arabia Standard Time
  • C - Charlie Time Zone
  • EAT - Eastern Africa Time
  • FET - Further Eastern European Time
  • IDT - Israel Daylight Time
  • TRT - Turkey Time

Central European Time

Offset: CET is 1 hour ahead of Greenwich Mean Time (GMT).

Countries using this time zone: Andorra, Albania, Austria, Bosnia & Herzegovina, Belgium, Switzerland, Czech Republic, Germany, Denmark, Algeria, Spain, France, Gibraltar, Croatia, Hungary, Italy, Liechtenstein, Luxembourg, Monaco, Montenegro, North Macedonia, Malta, Netherlands, Norway, Poland, Serbia, Sweden, Slovenia, Svalbard & Jan Mayen, Slovakia, San Marino, Tunisia, Vatican City

Principal Cities: The largest city in the CET time zone is Berlin in Germany, with about 3.426 million people. Other major cities in this time zone include Madrid, Algiers, Rome, Paris.

German: MEZ - Mitteleuropäische Zeit

Map of the areas on Central European Time (CET)
CET all year CET part of the year

On October 4, 2021 the lighter areas are on UTC+2 (CEST).

Daylight Saving: This is a standard time zone. During summer, some places set clocks forward one hour for daylight saving time and observe Central European Summer Time (CEST).

123456789101112End: Central European Time (CET) ended on Sunday, March 28, 2021 at 2:00 am02:00 local time and clocks were set one hour forward to Sunday, March 28, 2021, 3:00 am03:00 local daylight time instead. Standard time ends annually on the last Sunday of March.

123456789101112Start: Central European Time (CET) starts on Sunday, October 31, 2021 at 3:00 am03:00 local time and clocks are set one hour back to Sunday, October 31, 2021, 2:00 am02:00. Standard time starts annually on the last Sunday of October.

See upcoming clock changes worldwide.

CET 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 an offset of one hour to the east of the zero meridian.
Military/NATO: Used by the U.S. military, Chinese military and others
  • Alpha - Military abbreviation for CET
  • A - short form of 'Alpha'
IANA/Olson: Reflects CET time zone boundaries defined by political bodies, primarily intended for use with computer programs and operating systems
  • Africa/Algiers
  • Africa/Ceuta
  • Africa/Tunis
  • Arctic/Longyearbyen
  • Atlantic/Jan_Mayen
  • CET
  • Europe/Amsterdam
  • Europe/Andorra
  • Europe/Belgrade
  • Europe/Berlin
  • Europe/Bratislava
  • Europe/Brussels
  • Europe/Budapest
  • Europe/Busingen
  • Europe/Copenhagen
  • Europe/Gibraltar
  • Europe/Ljubljana
  • Europe/Luxembourg
  • Europe/Madrid
  • Europe/Malta
  • Europe/Monaco
  • Europe/Oslo
  • Europe/Paris
  • Europe/Podgorica
  • Europe/Prague
  • Europe/Rome
  • Europe/San_Marino
  • Europe/Sarajevo
  • Europe/Skopje
  • Europe/Stockholm
  • Europe/Tirane
  • Europe/Vaduz
  • Europe/Vatican
  • Europe/Vienna
  • Europe/Warsaw
  • Europe/Zagreb
  • Europe/Zurich
  • MET
  • Poland
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

British Summer Time

Offset: BST is 1 hour ahead of Greenwich Mean Time (GMT).

Countries using this time zone: Britain (UK), Guernsey, Isle of Man, Jersey

Principal Cities: The largest city in the BST time zone is London in the United Kingdom, with about 8.962 million people. Other major cities in this time zone include Birmingham, Glasgow, Manchester, Sheffield.

Map of the areas on British Summer Time (BST)
BST part of the year

On October 4, 2021 all shaded areas are on BST.

Daylight Saving: British Summer Time (BST) is a daylight saving/summer time zone. During winter, some places set clocks back one hour and observe Greenwich Mean Time (GMT).

123456789101112Start: British Summer Time (BST) started on Sunday, March 28, 2021 at 1:00 am01:00 local time and clocks were set one hour forward to Sunday, March 28, 2021, 2:00 am02:00. Daylight saving starts annually on the last Sunday of March.

123456789101112End: British Summer Time (BST) ends on Sunday, October 31, 2021 at 2:00 am02:00 local time and clocks are set one hour back to Sunday, October 31, 2021, 1:00 am01:00 local standard time instead. Daylight saving ends annually on the last Sunday of October.

See upcoming clock changes worldwide.

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 an offset of one hour 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
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