Does it account for Daylight Saving Time?

Yes, our converter uses the IANA timezone database, which includes all current DST rules for every timezone in the world.

UTC (Coordinated Universal Time) is the primary time standard by which the world regulates clocks. All timezones are defined as offsets from UTC.

Can I compare multiple timezones at once?

Yes, you can add multiple cities or timezones and see the equivalent times side by side.

How many timezones are there in the world?

There are 38 distinct UTC offsets in use, ranging from UTC-12 to UTC+14. This includes half-hour (UTC+5:30 India, UTC+9:30 Australia) and 45-minute offsets (UTC+5:45 Nepal, UTC+8:45 Australia).

What is the International Date Line?

The International Date Line (IDL) runs roughly along the 180° meridian in the Pacific Ocean. When you cross it westward, you gain a day; crossing eastward, you lose a day.

Why do some timezones have 30 or 45 minute offsets?

Countries chose offsets that best matched their solar noon. India uses UTC+5:30 and Nepal uses UTC+5:45 because standard hourly offsets didn't align well with their geography.

Which country has the most timezones?

France has the most (12 timezones) due to overseas territories. Russia spans 11 timezones. The US has 6 (including Hawaii and Alaska).

Tehran Time Zone — IRST (UTC+03:30)

Tehran, Iran runs on Iran Standard Time at UTC+03:30. It does not observe daylight saving time, so the offset is fixed all year. Convert Tehran time to any city below, or use the full converter.

Current UTC offset

UTC+03:30

IANA zone

Asia/Tehran

Daylight saving

Not observed

Zone abbreviation

IRST

About the IRST time zone

Iran Standard Time (IRST) is one of the few time zones with a 30-minute offset. Iran observes daylight saving time (IRDT, UTC+04:30) from late March to late September. Tehran, the capital, is one of the largest cities in the Middle East.

Countries on IRST

Iran

Major cities on IRST

TehranIsfahanMashhadTabrizShirazKaraj

Did you know?

Iran Standard Time (IRST) is one of few timezones with a 30-minute offset (UTC+3:30).
Tehran's Grand Bazaar is one of the oldest and largest bazaars in the Middle East.
The Iranian weekend is Thursday-Friday.

Tehran Time Zone — IRST (UTC+03:30)

About the IRST time zone

Convert Tehran time to another city

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Everything else on IRST

Learn more about time zones