What is the time difference between CLT and IRST?

Iran Standard Time (IRST) is 6 hours and 30 minutes ahead of Chile Standard Time (CLT). CLT uses a UTC offset of UTC-3, while IRST uses UTC+3:30. For example, when it's 9:00 AM in CLT, it's 3:30 PM in IRST. Note that this difference may shift by one hour during daylight saving time transitions if CLT observes DST. Use the conversion table above to see the exact time for each hour of the day.

How do I convert CLT to IRST?

To convert CLT to IRST, add 6 hours and 30 minutes to the CLT time. For example, 9:00 AM CLT is 3:30 PM IRST, and 5:00 PM CLT is 11:30 PM IRST. Keep in mind that during daylight saving time transitions, the offset between these timezones may temporarily change by one hour. You can also use the interactive converter above for quick, accurate results.

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

When it's 12:00 PM (noon) in CLT, it's 6:30 PM in IRST. This is because IRST is 6 hours and 30 minutes ahead of CLT. Similarly, when it's 6:00 PM in CLT, it's 12:30 AM in IRST. During daylight saving time transitions, these times may shift by one hour, so always verify the current offset. The color-coded conversion table above shows every hour mapped between both timezones.

How many hours ahead is IRST from CLT?

IRST is 6 hours and 30 minutes ahead of CLT. This means when it's 9:00 AM in CLT, it's 3:30 PM in IRST, and when it's midnight in CLT, it's 6:30 AM in IRST. The exact difference can vary by one hour during daylight saving time transitions. The conversion table above provides a complete hour-by-hour mapping.

Is IRST ahead or behind CLT?

IRST is ahead of CLT by 6 hours and 30 minutes. Clocks in IRST show a later time than CLT, meaning the day starts earlier in IRST relative to CLT. For example, when it's morning in CLT, it's already afternoon or evening in IRST. This gap may change by one hour during DST transitions.

Does CLT observe daylight saving time?

Yes, Chile Standard Time observes daylight saving time. Clocks move forward by one hour in spring and fall back in autumn. This seasonal shift means the time difference between CLT and IRST may change temporarily during transition periods. Check our DST change calendar for exact dates.

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.

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

The best time for a call between CLT and IRST is during overlapping business hours (9 AM – 5 PM) in both timezones. To reach someone in IRST during their work day, call between 2:30 AM and 10:30 AM your CLT time. Avoid calling too early or late, as the 6 hours and 30 minutes difference means your evening could be their late night. Check the color-coded conversion table above — green hours indicate business hours in both zones, making it easy to find the ideal time.

When does daylight saving time change in CLT?

Daylight saving time transitions vary by year and region. Chile Standard Time observes DST, which typically shifts clocks forward by one hour in spring ("spring forward") and back in fall ("fall back"). During these transition periods, the time difference between CLT and IRST may temporarily change by one hour, which can cause confusion for scheduled meetings or calls. It's important to double-check your conversions around transition dates, especially if the two timezones switch on different dates. Check our DST change calendar for exact transition dates in the current year.

Do CLT and IRST ever have the same time?

No, CLT and IRST never show the same time because their base UTC offsets are different. However, because CLT observes daylight saving time and IRST does not, the time difference between them changes by one hour during DST transitions. This means the gap narrows or widens depending on the season, but the two clocks never align. Always verify the current offset around DST transition dates to avoid scheduling errors.

CLT to IRST Converter

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

Timezone Details

Santiago

11:29 PM

Thursday, April 2, 2026

Santiago (UTC-03:00)

Tehran

5:59 AM

Friday, April 3, 2026

Tehran (UTC+03:30)

Difference: +6h 30m

24-Hour Overview

Santiago — 24-hour overview

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NightMorningBusinessEvening

Tehran — 24-hour overview

6a6a

9a9a

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11a

12p12p

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NightMorningBusinessEvening

Frequently Asked Questions

Related Conversions

IRST to CLT

Cities in These Timezones

CLT Cities

Santiago

IRST Cities

Tehran

More Tools

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

Learn More

How Time Zones Work Understanding DST Timezone Abbreviations

External Resources

IANA Time Zone Database