GMT to IRST Converter
Quick answers
GMT is 3 hours and 30 minutes behind IRST. GMT uses GMT +0, and IRST uses GMT +3:30 for this comparison.
For example, 12:00 pm GMT is 3:30 pm IRST. Use the converter above to adjust the date or time and create a shareable meeting link.
Best meeting overlap: 9am-1:30pm GMT, which is 12:30pm-5pm IRST.
Compare GMT time with IRST time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.
Time Difference
Greenwich Mean Time is 3 hours and 30 minutes behind Iran Standard Time
12:00 pm12:00 in GMT is 3:30 pm15:30 in IRST
GMT to IRST call time
Best time for a conference call or a meeting is between 9am-1:30pm in GMT which corresponds to 12:30pm-5pm in IRST
12:00 pm12:00 Greenwich Mean Time (GMT). Offset UTC 0:00 hours
3:30 pm15:30 Iran Standard Time (IRST). Offset UTC +3:30 hours
12:00 pm12:00 GMT / 3:30 pm15:30 IRST
| GMT | IRST |
|---|---|
| 12am (midnight) | 3:30 am |
| 1am | 4:30 am |
| 2am | 5:30 am |
| 3am | 6:30 am |
| 4am | 7:30 am |
| 5am | 8:30 am |
| 6am | 9:30 am |
| 7am | 10:30 am |
| 8am | 11:30 am |
| 9am | 12:30 pm |
| 10am | 1:30 pm |
| 11am | 2:30 pm |
| 12pm (noon) | 3:30 pm |
| 1pm | 4:30 pm |
| 2pm | 5:30 pm |
| 3pm | 6:30 pm |
| 4pm | 7:30 pm |
| 5pm | 8:30 pm |
| 6pm | 9:30 pm |
| 7pm | 10:30 pm |
| 8pm | 11:30 pm |
| 9pm | 12:30 am |
| 10pm | 1:30 am |
| 11pm | 2:30 am |
| 00:00 | 03:30 |
| 01:00 | 04:30 |
| 02:00 | 05:30 |
| 03:00 | 06:30 |
| 04:00 | 07:30 |
| 05:00 | 08:30 |
| 06:00 | 09:30 |
| 07:00 | 10:30 |
| 08:00 | 11:30 |
| 09:00 | 12:30 |
| 10:00 | 13:30 |
| 11:00 | 14:30 |
| 12:00 | 15:30 |
| 13:00 | 16:30 |
| 14:00 | 17:30 |
| 15:00 | 18:30 |
| 16:00 | 19:30 |
| 17:00 | 20:30 |
| 18:00 | 21:30 |
| 19:00 | 22:30 |
| 20:00 | 23:30 |
| 21:00 | 00:30 |
| 22:00 | 01:30 |
| 23:00 | 02:30 |
Greenwich Mean Time
Offset: GMT is 0 hours ahead Greenwich Mean Time (GMT) and is used in Europe
Countries using this time zone: 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 time zone is London in United Kingdom, with about 7.557 million people. Other major cities in this time zone include 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 the zero UTC/GMT offset.
- 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
- 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
Iran Standard Time
Offset: IRST is 3 hours and 30 minutes ahead Greenwich Mean Time (GMT) and is used in Asia
Countries using this time zone: Iran
Principal Cities: The largest city in the IRST time zone is Tehran in Iran, with about 7.153 million people. Other major cities in this time zone include Mashhad, Isfahan, Karaj, Tabriz.
Daylight Saving: Clocks in Iran Standard Time (IRST) do not change for daylight saving time, so IRST stays the same throughout the year. Other time zones may set clocks forward in summer and back in winter.
IRST representations, usage and related time zones
- +0330 - basic
- +03:30 - extended
- +0330 - sign character (+) followed by a four digit time providing hours (03) and minutes (30) of the offset. Indicates an offset of three hours and thirty minutes to the east of the zero meridian.