Tehran, Iran to GMT to EST
Time Difference
IST (Iran Standard Time) is 3 hours and 30 minutes ahead of Greenwich Mean Time and 8 hours and 30 minutes ahead of Eastern Standard Time
3:00 pm15:00 in Tehran, Iran is 11:30 am11:30 in GMT and is 6:30 am06:30 in EST
Tehran to GMT call time
Best time for a conference call or a meeting is between 11:30am-6pm in Tehran which corresponds to 8am-2:30pm in GMT
Tehran to EST call time
Best time for a conference call or a meeting is between 4:30pm-6:30pm in Tehran which corresponds to 8am-10am in EST
3:00 pm15:00 IST (Iran Standard Time) (Tehran, Iran). Offset UTC +3:30 hours
11:30 am11:30 Greenwich Mean Time (GMT). Offset UTC 0:00 hours
6:30 am06:30 Eastern Standard Time (EST). Offset UTC -5:00 hours
3:00 pm15:00 Tehran, Iran / 11:30 am11:30 GMT / 6:30 am06:30 EST
| Tehran, Iran | GMT | EST |
|---|---|---|
| 12am (midnight) | 8:30 pm | 3:30 pm |
| 1am | 9:30 pm | 4:30 pm |
| 2am | 10:30 pm | 5:30 pm |
| 3am | 11:30 pm | 6:30 pm |
| 4am | 12:30 am | 7:30 pm |
| 5am | 1:30 am | 8:30 pm |
| 6am | 2:30 am | 9:30 pm |
| 7am | 3:30 am | 10:30 pm |
| 8am | 4:30 am | 11:30 pm |
| 9am | 5:30 am | 12:30 am |
| 10am | 6:30 am | 1:30 am |
| 11am | 7:30 am | 2:30 am |
| 12pm (noon) | 8:30 am | 3:30 am |
| 1pm | 9:30 am | 4:30 am |
| 2pm | 10:30 am | 5:30 am |
| 3pm | 11:30 am | 6:30 am |
| 4pm | 12:30 pm | 7:30 am |
| 5pm | 1:30 pm | 8:30 am |
| 6pm | 2:30 pm | 9:30 am |
| 7pm | 3:30 pm | 10:30 am |
| 8pm | 4:30 pm | 11:30 am |
| 9pm | 5:30 pm | 12:30 pm |
| 10pm | 6:30 pm | 1:30 pm |
| 11pm | 7:30 pm | 2:30 pm |
| 0:00 | 20:30 | 15:30 |
| 1:00 | 21:30 | 16:30 |
| 2:00 | 22:30 | 17:30 |
| 3:00 | 23:30 | 18:30 |
| 4:00 | 0:30 | 19:30 |
| 5:00 | 1:30 | 20:30 |
| 6:00 | 2:30 | 21:30 |
| 7:00 | 3:30 | 22:30 |
| 8:00 | 4:30 | 23:30 |
| 9:00 | 5:30 | 0:30 |
| 10:00 | 6:30 | 1:30 |
| 11:00 | 7:30 | 2:30 |
| 12:00 | 8:30 | 3:30 |
| 13:00 | 9:30 | 4:30 |
| 14:00 | 10:30 | 5:30 |
| 15:00 | 11:30 | 6:30 |
| 16:00 | 12:30 | 7:30 |
| 17:00 | 13:30 | 8:30 |
| 18:00 | 14:30 | 9:30 |
| 19:00 | 15:30 | 10:30 |
| 20:00 | 16:30 | 11:30 |
| 21:00 | 17:30 | 12:30 |
| 22:00 | 18:30 | 13:30 |
| 23:00 | 19:30 | 14:30 |
Tehran Information
Time Zone
IRDT - Iran Daylight Time
+4:30 hours during Iran Daylight Time.
Tehran Facts
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 representations, usage and related time zones
- Z - is the zone designator for the zero UTC/GMT offset, also known as 'Zulu' time
- +00 - basic short
- +0000 - basic
- +00:00 - extended
- +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.
- Zulu - Military abbreviation for GMT
- Z - short form of 'Zulu'
- 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
- Greenwich Mean Time - UTC +0
- GMT+03:00 - UTC +3
- GMT+05:00 - UTC +5
- GMT - UTC +1
- GMT-02:00 - UTC -2
- GMT+12:00 - UTC +12
- 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
Eastern Standard Time
Offset: EST is 5 hours behind Greenwich Mean Time (GMT) and is used in North America
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
Daylight Saving: This is a standard timezone, however during summer some places switch clocks for one hour forward when daylight saving comes into effect and observe Eastern Daylight Time (EDT).
Start: Eastern Standard Time (EST) started on Sunday, November 2, 2025 at 2:00 am local time and clocks were set one hour back to Sunday, November 2, 2025, 1:00 am. Standard time starts annually the on first Sunday of November.
End: Eastern Standard Time (EST) ends on Sunday, March 8, 2026 at 2:00 am local time and clocks are set one hour forward to Sunday, March 8, 2026, 3:00 am local daylight time instead. Standard time starts annually the on second Sunday of March.
EST representations, usage and related time zones
- -05 - basic short
- -0500 - basic
- -05:00 - extended
- -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.
- Romeo - Military abbreviation for EST
- R - short form of 'Romeo'
- America/Atikokan
- America/Cancun
- America/Cayman
- America/Coral_Harbour
- 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/Jamaica
- America/Kentucky/Louisville
- America/Kentucky/Monticello
- America/Louisville
- America/Montreal
- America/Nassau
- America/New_York
- America/Nipigon
- America/Panama
- America/Pangnirtung
- America/Port-au-Prince
- America/Thunder_Bay
- America/Toronto
- Canada/Eastern
- EST
- EST5EDT
- Jamaica
- US/East-Indiana
- US/Eastern
- US/Michigan
- 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