UTC
Universal Time Coordinated
GMT +0
GMT
Greenwich Mean Time
GMT +0
Iran
IDT

Time Difference

Universal Time Coordinated is 0 hours ahead of Greenwich Mean Time and 4 hours and 30 minutes behind IDT (Iran Daylight Time)
9:30 am09:30 in UTC is 9:30 am09:30 in GMT and is 2:00 pm14:00 in Tehran, Iran

UTC to GMT call time
Best time for a conference call or a meeting is between 8am-6pm in UTC which corresponds to 8am-6pm in GMT
UTC to Tehran call time
Best time for a conference call or a meeting is between 8am-1:30pm in UTC which corresponds to 12:30pm-6pm in Tehran

9:30 am09:30 Universal Time Coordinated (UTC). Offset UTC 0:00 hours
9:30 am09:30 Greenwich Mean Time (GMT). Offset UTC 0:00 hours
2:00 pm14:00 IDT (Iran Daylight Time) (Tehran, Iran). Offset UTC +4:30 hours

9:30 am09:30 UTC / 9:30 am09:30 GMT / 2:00 pm14:00 Tehran, Iran

UTC GMT Tehran, Iran
12am (midnight) 12am (midnight) 4:30 am
1am 1am 5:30 am
2am 2am 6:30 am
3am 3am 7:30 am
4am 4am 8:30 am
5am 5am 9:30 am
6am 6am 10:30 am
7am 7am 11:30 am
8am 8am 12:30 pm
9am 9am 1:30 pm
10am 10am 2:30 pm
11am 11am 3:30 pm
12pm (noon) 12pm (noon) 4:30 pm
1pm 1pm 5:30 pm
2pm 2pm 6:30 pm
3pm 3pm 7:30 pm
4pm 4pm 8:30 pm
5pm 5pm 9:30 pm
6pm 6pm 10:30 pm
7pm 7pm 11:30 pm
8pm 8pm 12:30 am
9pm 9pm 1:30 am
10pm 10pm 2:30 am
11pm 11pm 3:30 am
0:00 0:00 4:30
1:00 1:00 5:30
2:00 2:00 6:30
3:00 3:00 7:30
4:00 4:00 8:30
5:00 5:00 9:30
6:00 6:00 10:30
7:00 7:00 11:30
8:00 8:00 12:30
9:00 9:00 13:30
10:00 10:00 14:30
11:00 11:00 15:30
12:00 12:00 16:30
13:00 13:00 17:30
14:00 14:00 18:30
15:00 15:00 19:30
16:00 16:00 20:30
17:00 17:00 21:30
18:00 18:00 22:30
19:00 19:00 23:30
20:00 20:00 0:30
21:00 21:00 1:30
22:00 22:00 2:30
23:00 23:00 3:30

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

Greenwich Mean Time

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

Countries: It is used in following countries: Burkina Faso, Côte d'Ivoire, Britain (UK), Guernsey, Ghana, Greenland, Gambia, Guinea, Guinea-Bissau, Ireland, Isle of Man, Iceland, Jersey, Liberia, Mali, Mauritania, St Helena, Sierra Leone, Senegal, Sao Tome & Principe, Togo

Principal Cities: The largest city in the GMT timezone is London from United Kingdom with population about 7.557 million people. Other major cities in the area are Abidjan, Dakar, Grand Dakar, Accra

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.

GMT Time Zone Geo Map
GMT timezone map

GMT 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 GMT
  • Z - short form of 'Zulu'
IANA/Olson: Reflects GMT time zone boundaries defined by political bodies, primarily intended for use with computer programs and operating systems
  • Africa/Abidjan
  • Africa/Accra
  • Africa/Bamako
  • Africa/Banjul
  • Africa/Bissau
  • Africa/Conakry
  • Africa/Dakar
  • Africa/Freetown
  • Africa/Lome
  • Africa/Monrovia
  • Africa/Nouakchott
  • Africa/Ouagadougou
  • Africa/Sao_Tome
  • Africa/Timbuktu
  • America/Danmarkshavn
  • Atlantic/Reykjavik
  • Atlantic/St_Helena
  • Eire
  • Etc/GMT
  • Etc/GMT+0
  • Etc/GMT-0
  • Etc/GMT0
  • Etc/Greenwich
  • Europe/Belfast
  • Europe/Dublin
  • Europe/Guernsey
  • Europe/Isle_of_Man
  • Europe/Jersey
  • Europe/London
  • GB
  • GB-Eire
  • GMT
  • GMT+0
  • GMT-0
  • GMT0
  • Greenwich
  • Iceland
GMT Abbreviation: Several time zones share GMT abbreviation and it could refer to these time zones
  • Greenwich Mean Time - UTC +0
  • GMT+03:00 - UTC +3
  • GMT+06:00 - UTC +6
  • GMT - UTC +0
  • GMT+11:00 - UTC +11
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

Tehran Information

Time Zone

Abbreviation / Name
IDT - Iran Daylight Time
IRDT - Iran Daylight Time
UTC / GMT Offset
+4:30 hours during Iran Daylight Time, currently in use.
+4:30 hours during Iran Daylight Time.
Daylight Saving Time Change
0:00 hours - DST is NOT in use
Daylight Saving Time Starts
Also called Spring Forward or Summer Time.
Daylight Saving Time Ends
Also called Fall Back or switch to Winter Time.

Tehran Facts

Country
Iran
Alternative Names
THR, Taekhran, Tahran, Techerane, Teera, Teerao, Teerã, Teerão, Tegeran, Teheran, Teherana, Teheranas, Teherano, Teherán, Teherāna, Tehran, Tehrano, Tekheran, Téhéran, de hei lan, teharan, teharana, tehelan, teheran, tehran, teirani, thran, thrn, thrwn, tihiran, tihran, Τεχεράνη, Тæхран, Тегеран, Техеран, Теҳрон, Թեհրան, טהראן, טהרן, تهران, تهرون, تِهران, تِهِرَن, تہران, طهران, ܛܗܪܐܢ, तेहरान, তেহরান, தெஹ்ரான், เตหะราน, ཏེ་ཧི་རན​།, თეირანი, ቴህራን, テヘラン, 德黑兰, 테헤란
Population
7,153,309
Currency
Rial (IRR)
Geographic Coordinates
35° 41' N Latitude / 51° 25' E Longitude
International Dialing Code
+98