The Timezone IRST In Iran

IRST time in Iran Time zones are always calculated by their difference to UTC, the "Universal Time Coordinated". In Iran there is only a single time zone at UTC+3.5. For example, New York is currently at UTC-5 in Eastern Time, so the time difference between New York and Iran is 8.5 hours.

Iran has no time difference between summer and winter. A daylight saving time doesn't exist. Back to overview: IranCurrent time in all regions of Iran:00:00December 2025

Only 1 nationwide time zone

Standard time: Iran Standard Time (IRST) (UTC +3.5)Daylight saving time: discontinued 2022Iran has an east-west extension of 16.7 degrees of longitude. Given the country's location in South Asia, this corresponds to about 1500 kilometers. At this extension, the sun's course is noticeable at different positions in the country, but it still turns out to be moderate. The position of the sun in the west of the country differs from that in the east by about 67 minutes. This means the sun rises and sets 67 minutes later in the west than in the east. This time difference is already a reason for a second time zone in some other countries. However, this would of course also have organizational and economic disadvantages.

No more daylight saving time in Iran

Due to the sun's orbit around the equator, the days are longer in summer (June to September in the northern hemisphere). Countries that switch to daylight saving time in the summer months align the daylight phase with the human rhythm. Unused bright morning hours are thus shifted into the evening (more information on daylight saving time here).

Due to its distance from the equator, the impact would be significant in Iran. Tehran is located 4,000 km from the equator. A day in midsummer would then not last from 04:47 to 19:25, but from 05:47 to 20:25. Nevertheless, in 2022 it was decided to finally abandon daylight saving time in Iran.

Changes in Daylight Saving Times

Since 1977, Iran has tried to introduce daylight saving three times: from 1977 to 1980, 1991 to 2005 and 2008 to 2022. On the night of September 21, 2022 at 11:00 pm, the changeover from summer to winter time ended and the current time zone was retained.

Time differences to Tehran

Los Angeles-11.5 hoursDenver-10.5 hoursMexico City-9.5 hoursChicago-9.5 hoursNew York-8.5 hoursBuenos Aires-6.5 hoursUTC-3.5 hoursLisbon-3.5 hoursLondon-3.5 hoursDublin-3.5 hoursBerlin-2.5 hoursJohannesburg-1.5 hoursAthens-1.5 hoursMoscow-0.5 hoursDubai+0.5 hoursKolkata+2 hoursBangkok+3.5 hoursShanghai+4.5 hoursSingapore+4.5 hoursPerth+4.5 hoursTokyo+5.5 hoursSydney+7.5 hoursAuckland+9.5 hoursSunrise and sunset in IranSunrise and sunset times of the most important cities in in Iran. Day lengths per month and the actual sun angles and sunshine hours.All Countries with DSTA summary of all countries that currently observe Daylight Saving Time with further info on introductions and upcoming changes.Cambodia: country data and statisticsCambodia in numbers: demographics, economy, energy, climate, currency, religions, languages, time zone and more data and comparisons with other countries.🔎︎