What is the time difference between IRST and UTC?

Coordinated Universal Time (UTC) is 3 hours and 30 minutes behind Iran Standard Time (IRST). IRST uses a UTC offset of UTC+3:30, while UTC uses UTC. For example, when it's 9:00 AM in IRST, it's 5:30 AM in UTC. This difference remains constant year-round since neither timezone observes daylight saving time. Use the conversion table above to see the exact time for each hour of the day.

How do I convert IRST to UTC?

To convert IRST to UTC, subtract 3 hours and 30 minutes from the IRST time. For example, 9:00 AM IRST is 5:30 AM UTC, and 5:00 PM IRST is 1:30 PM UTC. Since neither timezone observes DST, this conversion stays the same all year. You can also use the interactive converter above for quick, accurate results.

What time is it in UTC when it's noon in IRST?

When it's 12:00 PM (noon) in IRST, it's 8:30 AM in UTC. This is because UTC is 3 hours and 30 minutes behind IRST. Similarly, when it's 6:00 PM in IRST, it's 2:30 PM in UTC. This relationship is constant throughout the year. The color-coded conversion table above shows every hour mapped between both timezones.

How many hours behind is UTC from IRST?

UTC is 3 hours and 30 minutes behind IRST. This means when it's 9:00 AM in IRST, it's 5:30 AM in UTC, and when it's midnight in IRST, it's 8:30 PM in UTC. This offset is constant throughout the year since neither timezone uses daylight saving time. The conversion table above provides a complete hour-by-hour mapping.

Is UTC ahead or behind IRST?

UTC is behind IRST by 3 hours and 30 minutes. Clocks in UTC show an earlier time than IRST, meaning the day starts later in UTC relative to IRST. For example, when it's noon in IRST, it's still 8:30 AM in UTC. This difference stays the same year-round.

Does IRST observe daylight saving time?

No, Iran Standard Time does not observe daylight saving time. The UTC offset of UTC+3:30 remains the same year-round, which simplifies time conversions. Regions using IRST keep their clocks unchanged regardless of the season.

Does UTC observe daylight saving time?

No, Coordinated Universal Time does not observe daylight saving time. The UTC offset of UTC remains the same year-round, which simplifies time conversions. Regions using UTC keep their clocks unchanged regardless of the season.

What is the best time to call from IRST to UTC?

The best time for a call between IRST and UTC is during overlapping business hours (9 AM – 5 PM) in both timezones. To reach someone in UTC during their work day, call between 12:30 PM and 8:30 PM your IRST time. Avoid calling too early or late, as the 3 hours and 30 minutes difference means your evening could be their early morning. Check the color-coded conversion table above — green hours indicate business hours in both zones, making it easy to find the ideal time.

Do IRST and UTC ever have the same time?

No, IRST and UTC are always 3 hours and 30 minutes apart and never display the same clock time simultaneously. Neither timezone observes DST, so the difference is constant year-round with no seasonal variation. The 3 hours and 30 minutes offset is determined by their fixed positions relative to the Prime Meridian (UTC). You can always rely on this consistent difference when planning across these timezones.

IRST to UTC Converter

Convert Iran Standard Time to Coordinated Universal Time. See the hour-by-hour conversion table below.

Timezone Details

Tehran

11:19 AM

Friday, April 3, 2026

Tehran (UTC+03:30)

UTC

7:49 AM

Friday, April 3, 2026

UTC (UTC+00:00)

Difference: -3h 30m

24-Hour Overview

Tehran — 24-hour overview

12a12a

3a3a

6a6a

9a9a

10a

11a

12p12p

3p3p

6p6p

9p9p

10p

11p

NightMorningBusinessEvening

UTC — 24-hour overview

8p8p

10p

11p11p

12a

2a2a

5a5a

8a8a

10a

11a11a

12p

2p2p

5p5p

NightMorningBusinessEvening

Frequently Asked Questions

Related Conversions

UTC to IRST

Cities in These Timezones

IRST Cities

Tehran

More Tools

Compare IRST & UTC Plan a Meeting (IRST & UTC)See on Map

Learn More

How Time Zones Work Understanding DST Timezone Abbreviations

External Resources

Coordinated Universal Time on Wikipedia IANA Time Zone Database