UTC
Universal Time Coordinated
GMT +0
ET/EDT
Eastern Time
GMT -4
CT/CDT
Central Time
GMT -5
PT/PDT
Pacific Time
GMT -7

Time Difference

Universal Time Coordinated is 4 hours ahead of Eastern Daylight Time and 5 hours ahead of Central Daylight Time and 7 hours ahead of Pacific Daylight Time
So 11:00 pm23:00 in UTC is 7:00 pm19:00 in EDT and is 6:00 pm18:00 in CDT and is 4:00 pm16:00 in PDT

11:00 pm23:00 Universal Time Coordinated (UTC). Offset UTC 0:00 hours
7:00 pm19:00 Eastern Daylight Time (EDT). Offset UTC -4:00 hours
6:00 pm18:00 Central Daylight Time (CDT). Offset UTC -5:00 hours
4:00 pm16:00 Pacific Daylight Time (PDT). Offset UTC -7:00 hours

11:00 pm23:00 UTC / 7:00 pm19:00 EDT / 6:00 pm18:00 CDT / 4:00 pm16:00 PDT

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

Universal Time Coordinated

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

Coordinated Universal Time (UTC) is the world time standard that regulates clocks and time. It is successor to Greenwich Mean Time (GMT). For casual use, UTC is the same as GMT, but is used by the scientific community.
UTC is the time standard commonly used across the world since 1972. It is used in many technical fields, like aviation industry and meteorologists, also used to synchronize time across internet networks.

UTC 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 UTC
  • Z - short form of 'Zulu'

IANA/Olson: Reflects UTC time zone boundaries defined by political bodies, primarily intended for use with computer programs and operating systems
  • Etc/UCT
  • Etc/UTC
  • Etc/Universal
  • Etc/Zulu
  • UCT
  • UTC
  • Universal
  • Zulu

Time zones with the GMT +0 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
  • GMT - GMT


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: It is used in following countries: Bahamas, Canada, Haiti, Jamaica, Cayman Islands, Mexico, Panama, Turks & Caicos Is, United States.

Principal Cities: The largest city in the EST 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.

French: HNE - Heure Normale de l'Est

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

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 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 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
  • -05 -


Central Time

Central Time (PT) is a general term used to describe the areas that observe either the Central Standard Time (CST) or Central Daylight Time (CDT) in the United States and Canada. CT is not static but switches between CDT and CST.

Territories observing the time zone are primarily in North and Central America. It runs through several Mexican and U.S. states, as well as several Canadian provinces and Central American countries.

Countries: It is used in following countries: Belize, Canada, Costa Rica, Guatemala, Honduras, Mexico, Nicaragua, El Salvador, United States.

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

French: HNC - Heure Normale du Centre

Spanish: CT - Tiempo Central Estándar, CT - Zona Centro

CT representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data
  • -06 - basic short
  • -0600 - basic
  • -06:00 - extended

Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers
  • -0600 - sign character (-) followed by a four digit time providing hours (06) and minutes (00) of the offset. Indicates six 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
  • Sierra - Military abbreviation for CT
  • S - short form of 'Sierra'

Time zones with the GMT -6 offset:

  • CST - Central Standard Time
  • CT - Central Time
  • MDT - Mountain Daylight Time
  • EAST - Easter Island Standard Time
  • GALT - Galapagos Time
  • S - Sierra Time Zone
  • -06 -


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

Principal Cities: The largest city in the PST 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.

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 eight 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
  • 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
  • YDT - Yukon Daylight Time
  • PST - Pitcairn Standard Time
  • U - Uniform Time Zone