GMT
Greenwich Mean Time
GMT +0
GMT (GMT+04:30)
GMT +4:30
E
Echo Time Zone
GMT +5

Time Difference

Greenwich Mean Time is 4 hours and 30 minutes behind of GMT (GMT+04:30) and 5 hours behind of Echo Time Zone
8:00 pm20:00 in GMT is 12:30 am00:30 in Tehran, Iran and is 1:00 am01:00 in E

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

8:00 pm20:00 Greenwich Mean Time (GMT). Offset UTC 0:00 hours
12:30 am00:30 GMT (GMT+04:30) (Tehran, Iran). Offset UTC +4:30 hours
1:00 am01:00 Echo Time Zone (E). Offset UTC +5:00 hours

8:00 pm20:00 GMT / 12:30 am00:30 Tehran, Iran / 1:00 am01:00 E

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

Greenwich Mean Time

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

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 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+04:00 - UTC +4
  • GMT-05:00 - UTC -5
  • GMT - UTC +0
  • GMT+13:00 - UTC +13
  • GMT-03:00 - UTC -3
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
  • +00 -

Tehran Information

Time Zone

Abbreviation / Name
GMT - GMT+04:30
+0430 -
UTC / GMT Offset
+4:30 hours during GMT+04:30, currently in use.
+4:30 hours during .
Daylight Saving Time Change
0:00 hours - DST is in use
Daylight Saving Time Starts
September 20 at 23:00 local time. DST starts annually on the same date and time.. Clocks are turned 0 hour forward. Also called Spring Forward or Summer Time.
Daylight Saving Time Ends
March 21 at 23:59 local time. DST ends annually on the same date and time.. Clocks are turned 0 hour backward. 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