PDT (Pacific Daylight Time)
GMT -7
CDT (Central Daylight Time)
GMT -5
EDT (Eastern Daylight Time)
GMT -4
BST (British Summer Time)
GMT +1

Time Difference

PDT (Pacific Daylight Time) is 2 hours behind of CDT (Central Daylight Time) and 3 hours behind of EDT (Eastern Daylight Time) and 8 hours behind of BST (British Summer Time)
So 9:00 am09:00 in San Francisco, California, USA is 11:00 am11:00 in Chicago, Illinois, USA and is 12:00 pm12:00 in New York City, New York, USA and is 5:00 pm17:00 in London, United Kingdom

9:00 am09:00 PDT (Pacific Daylight Time) (San Francisco, California, USA). Offset UTC -7:00 hours
11:00 am11:00 CDT (Central Daylight Time) (Chicago, Illinois, USA). Offset UTC -5:00 hours
12:00 pm12:00 EDT (Eastern Daylight Time) (New York City, New York, USA). Offset UTC -4:00 hours
5:00 pm17:00 BST (British Summer Time) (London, United Kingdom). Offset UTC +1:00 hour

9:00 am09:00 San Francisco, California, USA / 11:00 am11:00 Chicago, Illinois, USA / 12:00 pm12:00 New York City, New York, USA / 5:00 pm17:00 London, United Kingdom

San Francisco, California, USA Chicago, Illinois, USA New York City, New York, USA London, United Kingdom
12am (midnight) 2am 3am 8am
1am 3am 4am 9am
2am 4am 5am 10am
3am 5am 6am 11am
4am 6am 7am 12pm (noon)
5am 7am 8am 1pm
6am 8am 9am 2pm
7am 9am 10am 3pm
8am 10am 11am 4pm
9am 11am 12pm (noon) 5pm
10am 12pm (noon) 1pm 6pm
11am 1pm 2pm 7pm
12pm (noon) 2pm 3pm 8pm
1pm 3pm 4pm 9pm
2pm 4pm 5pm 10pm
3pm 5pm 6pm 11pm
4pm 6pm 7pm 12am (midnight)
5pm 7pm 8pm 1am
6pm 8pm 9pm 2am
7pm 9pm 10pm 3am
8pm 10pm 11pm 4am
9pm 11pm 12am (midnight) 5am
10pm 12am (midnight) 1am 6am
11pm 1am 2am 7am
0:00 2:00 3:00 8:00
1:00 3:00 4:00 9:00
2:00 4:00 5:00 10:00
3:00 5:00 6:00 11:00
4:00 6:00 7:00 12:00
5:00 7:00 8:00 13:00
6:00 8:00 9:00 14:00
7:00 9:00 10:00 15:00
8:00 10:00 11:00 16:00
9:00 11:00 12:00 17:00
10:00 12:00 13:00 18:00
11:00 13:00 14:00 19:00
12:00 14:00 15:00 20:00
13:00 15:00 16:00 21:00
14:00 16:00 17:00 22:00
15:00 17:00 18:00 23:00
16:00 18:00 19:00 0:00
17:00 19:00 20:00 1:00
18:00 20:00 21:00 2:00
19:00 21:00 22:00 3:00
20:00 22:00 23:00 4:00
21:00 23:00 0:00 5:00
22:00 0:00 1:00 6:00
23:00 1:00 2:00 7:00

PDT (Pacific Daylight Time)

Offset: PDT is 7 hours behind Greenwich Mean Time (GMT) and is used in North America

Countries: It is used in following countries: Canada, Mexico, United States

Principal Cities: The largest city in the PDT timezone is Los Angeles from USA with population about 3.793 million people. Other major cities in the area are Vancouver, Tijuana, San Diego, San Jose

Daylight Saving: Pacific Daylight Time (PDT) is a daylight saving/summer timezone, however during winter some places switch clocks for one hour back and observe Pacific Standard Time (PST).

Start: Pacific Daylight Time (PDT) starts annually on the same date and time. and clocks were set one hour forward on Sunday, March 8, 2020, at 2:00 (2:00 am) local time.

End: Pacific Daylight Time (PDT) ends annually on the same date and time. and clocks are set one hour back on Sunday, November 1, 2020, at 2:00 (2:00 am) local time.

French: HAP - Heure Avancée du Pacifique

Spanish: PT - Zona Noroeste

San Francisco, California, USA Time Zone Geo Map
San Francisco, California, USA timezone map
San Francisco, California, USA representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data
  • -07 - basic short
  • -0700 - basic
  • -07:00 - extended

Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers
  • -0700 - sign character (-) followed by a four digit time providing hours (07) and minutes (00) of the offset. Indicates seven hour and zero minutes time differences to the west of the zero meridian.

Military/NATO: Used by the U.S. military, Chinese military and others
  • Tango - Military abbreviation for PDT
  • T - short form of 'Tango'

IANA/Olson: Reflects PDT time zone boundaries defined by political bodies, primarily intended for use with computer programs and operating systems
  • America/Dawson
  • America/Ensenada
  • America/Los_Angeles
  • America/Santa_Isabel
  • America/Tijuana
  • America/Vancouver
  • America/Whitehorse
  • Canada/Pacific
  • Canada/Yukon
  • Mexico/BajaNorte
  • PST8PDT
  • US/Pacific
  • US/Pacific-New

Time zones with the GMT -7 offset:

  • MST - Mountain Standard Time
  • PDT - Pacific Daylight Time
  • T - Tango Time Zone


CDT (Central Daylight Time)

Offset: CDT is 5 hours behind Greenwich Mean Time (GMT) and is used in North America

Countries: It is used in following countries: Canada, Cuba, Mexico, United States

Principal Cities: The largest city in the CDT timezone is Mexico City from Mexico with population about 12.294 million people. Other major cities in the area are Chicago, Havana, Houston, Iztapalapa

Daylight Saving: Central Daylight Time (CDT) is a daylight saving/summer timezone, however during winter some places switch clocks for one hour back and observe Central Standard Time (CST).

Start: Central Daylight Time (CDT) starts annually on the same date and time. and clocks were set one hour forward on Sunday, March 8, 2020, at 2:00 (2:00 am) local time.

End: Central Daylight Time (CDT) ends annually on the same date and time. and clocks are set one hour back on Sunday, November 1, 2020, at 2:00 (2:00 am) local time.

French: HAC - Heure Avancée du Centre

Spanish: CT - Zona Centro

Chicago, Illinois, USA Time Zone Geo Map
Chicago, Illinois, USA timezone map
Chicago, Illinois, USA 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 five hour and zero minutes time differences to the west of the zero meridian.

Military/NATO: Used by the U.S. military, Chinese military and others
  • Romeo - Military abbreviation for CDT
  • R - short form of 'Romeo'

IANA/Olson: Reflects CDT time zone boundaries defined by political bodies, primarily intended for use with computer programs and operating systems
  • America/Bahia_Banderas
  • America/Chicago
  • America/Indiana/Knox
  • America/Indiana/Tell_City
  • America/Knox_IN
  • America/Matamoros
  • America/Menominee
  • America/Merida
  • America/Mexico_City
  • America/Monterrey
  • America/North_Dakota/Beulah
  • America/North_Dakota/Center
  • America/North_Dakota/New_Salem
  • America/Rainy_River
  • America/Rankin_Inlet
  • America/Resolute
  • America/Winnipeg
  • CST6CDT
  • Canada/Central
  • Mexico/General
  • US/Central
  • US/Indiana-Starke

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

  • Central Daylight Time - UTC -5
  • Cuba Daylight Time - UTC -4

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
  • -05 -
  • CWT -


EDT (Eastern Daylight Time)

Offset: EDT is 4 hours behind Greenwich Mean Time (GMT) and is used in North America

Countries: It is used in following countries: Bahamas, Canada, Haiti, Turks & Caicos Is, United States

Principal Cities: The largest city in the EDT timezone is New York City from USA with population about 8.175 million people. Other major cities in the area are Toronto, Montreal, Brooklyn, Borough of Queens

Daylight Saving: Eastern Daylight Time (EDT) is a daylight saving/summer timezone, however during winter some places switch clocks for one hour back and observe Eastern Standard Time (EST).

Start: Eastern Daylight Time (EDT) starts annually on the same date and time. and clocks were set one hour forward on Sunday, March 8, 2020, at 2:00 (2:00 am) local time.

End: Eastern Daylight Time (EDT) ends annually on the same date and time. and clocks are set one hour back on Sunday, November 1, 2020, at 2:00 (2:00 am) local time.

French: HAE - Heure Avancée de l'Est

Spanish: EDT - Tiempo de verano del Este, ET - Zona Sureste

New York City, New York, USA Time Zone Geo Map
New York City, New York, USA timezone map
New York City, New York, USA 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 four hour and zero minutes time differences to the west of the zero meridian.

Military/NATO: Used by the U.S. military, Chinese military and others
  • Quebec - Military abbreviation for EDT
  • Q - short form of 'Quebec'

IANA/Olson: Reflects EDT time zone boundaries defined by political bodies, primarily intended for use with computer programs and operating systems
  • America/Detroit
  • America/Fort_Wayne
  • America/Grand_Turk
  • America/Indiana/Indianapolis
  • America/Indiana/Marengo
  • America/Indiana/Petersburg
  • America/Indiana/Vevay
  • America/Indiana/Vincennes
  • America/Indiana/Winamac
  • America/Indianapolis
  • America/Iqaluit
  • America/Kentucky/Louisville
  • America/Kentucky/Monticello
  • America/Louisville
  • America/Montreal
  • America/Nassau
  • America/New_York
  • America/Nipigon
  • America/Pangnirtung
  • America/Port-au-Prince
  • America/Thunder_Bay
  • America/Toronto
  • Canada/Eastern
  • EST5EDT
  • US/East-Indiana
  • US/Eastern
  • US/Michigan

Time zones with the GMT -4 offset:

  • AST - Atlantic Standard Time
  • EDT - Eastern Daylight Time
  • AMT - Amazon Time
  • BOT - Bolivia Time
  • CDT - Cuba Daylight Time
  • CLT - Chile Standard Time
  • FKT - Falkland Island Time
  • GYT - Guyana Time
  • PYT - Paraguay Time
  • Q - Quebec Time Zone
  • VET - Venezuelan Standard Time
  • -04 -


BST (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

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).

Start: British Summer Time (BST) starts annually on the same date and time. and clocks were set one hour forward on Sunday, March 29, 2020, at 1:00 (1:00 am) local time.

End: British Summer Time (BST) ends annually on the same date and time. and clocks are set one hour back on Sunday, October 25, 2020, at 2:00 (2:00 am) local time.

London, United Kingdom Time Zone Geo Map
London, United Kingdom timezone map
London, United Kingdom 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

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
  • +01 -