Does it handle Daylight Saving Time?

Yes, the tool automatically adjusts for Daylight Saving Time based on the specific date you select, ensuring accurate conversions year-round.

Can I add multiple cities?

Yes, you can add as many cities as you need to the dashboard to compare times across your entire global network simultaneously.

Iran to CLT

-7h 30m

Iran

IRSTSOURCE

UTC+03:30

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

CLT

UTC-03:00☀ DST active

HH04

MM30

04:30 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

Iran

CLT

12:00 AM

5:30 PM-1

2:00 AM

7:30 PM-1

4:00 AM

9:30 PM-1

6:00 AM

11:30 PM-1

8:00 AM

1:30 AM

10:00 AM

3:30 AM

12:00 PM

5:30 AM

2:00 PM

7:30 AM

4:00 PM

9:30 AM

6:00 PM

11:30 AM

8:00 PM

1:30 PM

10:00 PM

3:30 PM

Green rows indicate typical business hours (9 AM - 5 PM)

IRST and CLT on the World Map

The map below highlights the IRST (Iran Standard Time) and CLT (Chile Standard Time) timezone regions across the globe.

IRST Zone

→

CLT Zone

Explore all world timezones interactively →

IRST – Iran Standard Time

UTC+03:30

Iran Standard Time (IRST) is the time zone for Iran, 3 hours and 30 minutes ahead of UTC.

Countries in IRST

Iran

Major Cities in IRST

TehranIsfahanMashhadTabrizShirazKaraj

Key Facts about IRST

•IRST is one of only a few time zones with a 30-minute offset.
•Iran observes daylight saving time, switching to IRDT (UTC+04:30).
•Tehran has a metropolitan population of over 16 million.

Daylight Saving:Yes – switches to IRDT

Learn more about IRST on Wikipedia

CLT – Chile Standard Time

UTC-04:00

Chile Standard Time (CLT) is the time zone for continental Chile, 4 hours behind UTC.

Countries in CLT

Chile

Major Cities in CLT

SantiagoValparaísoConcepciónViña del MarAntofagasta

Key Facts about CLT

•Chile observes daylight saving time, switching to CLST (UTC-03:00) in summer.
•Santiago is the largest city in Chile with over 6 million in the metro area.
•Chile spans over 4,300 km from north to south but uses one timezone.

Daylight Saving:Yes – switches to CLST

Learn more about CLT on Wikipedia

Comparing Time Zones: Iran and CLT

Iran runs on Iran Standard Time (IRST) at UTC+03:30. CLT runs on Chile Standard Time (CLT) at UTC-04:00. That puts Iran 7 hours 30 minutes behind CLT — a difference of -7h 30m at the current offsets.

In practice, when it is 9:00 AM in Iran it is 1:30 AM in CLT. Midnight in Iran is 4:30 PM in CLT. Neither zone observes daylight saving time, so the offset between them stays constant all year.

Iran to CLT time conversion table

Iran (IRST)	CLT (CLT)	Day
12:00 AM	4:30 PM	previous day
6:00 AM	10:30 PM	previous day
7:00 AM	11:30 PM	previous day
8:00 AM	12:30 AM	same day
9:00 AM	1:30 AM	same day
12:00 PM	4:30 AM	same day
3:00 PM	7:30 AM	same day
5:00 PM	9:30 AM	same day
6:00 PM	10:30 AM	same day
9:00 PM	1:30 PM	same day

Why people convert Iran to CLT time

Scheduling a call from Iran to CLT: a 10:00 AM start in Iran lands at 2:30 AM in CLT, so you can confirm the slot without doing the arithmetic yourself.
Finding shared working hours: both Iran and CLT are inside the 9-to-5 working day between 4:30 PM and 5:00 PM IRST time (9:00 AM–9:30 AM CLT). That is roughly 0 hours 30 minutes of usable overlap.
Watching a live event or market open: Iran viewers need 1:30 AM in CLT to catch a 9:00 AM start there, and 7:30 AM if the event is anchored to Iran.

Always state the zone abbreviation, not just the hour. "3:00 PM IRST" is unambiguous; "3 PM" across a -7h 30m gap is not.
Block 4:30 PM–5:00 PM IRST as the recurring meeting window if you work primarily from Iran and need CLT colleagues present.

About IRST (Iran Standard Time)

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.

About CLT (Chile Standard Time)

Chile Standard Time (CLT) is the standard time in Chile. During summer months (October to March), Chile switches to Chile Summer Time (CLST, UTC-03:00). Chile is the longest north-south country in the world.

Best time to call between Iran and CLT

Both Iran and CLT sit inside the 9 AM – 5 PM working day between 4:30 PM–5:00 PM IRST, which is 9:00 AM–9:30 AM CLT. That gives roughly 0 hours and 30 minutes of shared time — the safest window for a live call or meeting.

Business hours overlap

Iran and CLT overlap for only 30 minutes (4:30 PM–5:00 PM IRST), so meetings have to be booked precisely.

Iran is 7 hours 30 minutes behind CLT (IRST UTC+03:30 → CLT UTC-04:00). The shared working window is 4:30 PM–5:00 PM IRST. Remember to re-check around daylight-saving transitions.

🕐 Daylight Saving Time Info

Iran

Does not observe DST

CLT

☀ Currently in DST

Standard: UTC-04:00 · DST: UTC-03:00

Clocks fall back on Sun, Apr 4, 2027

Learn More About Time

Dive deeper into the fascinating world of timekeeping, time zones, and how they shape our global society:

⏳

History of Timekeeping

From sundials to atomic clocks - 5000 years of measuring time

🌍

How Time Zones Work

UTC, offsets, and why zones don't follow straight lines

☀️

Daylight Saving Time

DST dates, which countries observe it, and the ongoing debate

Frequently Asked Questions

What is the time difference between Iran and CLT?

Iran (IRST, UTC+03:30) is 7 hours 30 minutes behind CLT (CLT, UTC-04:00). The gap is currently -7h 30m.

How do I convert Iran time to CLT time?

Add -7h 30m to Iran local time. For example, 9:00 AM in Iran is 1:30 AM in CLT.

What time is it in CLT right now?

CLT uses CLT at UTC-04:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -7h 30m offset from Iran.

What is the best time to call CLT from Iran?

Call between 4:30 PM and 5:00 PM IRST — that maps to 9:00 AM–9:30 AM CLT and keeps both parties inside the working day.

Which is behind, Iran or CLT?

Iran is 7 hours 30 minutes behind CLT. When it is 12:00 PM in Iran it is 4:30 AM in CLT.

Do Iran and CLT use different time zones?

Iran (Iran) uses IRST at UTC+03:30, while CLT uses CLT at UTC-04:00. The IANA identifiers are Asia/Tehran and America/Santiago.

Does daylight saving time affect the Iran–CLT difference?

Neither zone observes daylight saving time, so the -7h 30m offset between Iran and CLT is fixed all year.

Which other cities share Iran's time zone?

IRST also covers Tehran, Isfahan, Mashhad, Tabriz, Shiraz, Karaj.

Which countries use IRST, Iran's zone?

IRST is used in Iran.

Is there a day difference between Iran and CLT?

Not normally. The -7h 30m gap only pushes the date over the previous day.

What is the time difference between Iran and CLT?

CLT is -7h 30m from Iran.

What timezone is Iran in?

Iran operates on its local timezone.

What timezone is CLT in?

CLT operates on its local timezone.

Which countries use IRST (Iran Standard Time)?

IRST is used in Iran.

Does IRST observe daylight saving time?

Yes, IRST switches to IRDT during summer months.

What are some interesting facts about IRST?

IRST is one of only a few time zones with a 30-minute offset. Iran observes daylight saving time, switching to IRDT (UTC+04:30).

Which cities are in the CLT timezone?

Major cities in the CLT timezone include Santiago, Valparaíso, Concepción, Viña del Mar, Antofagasta.

What is the UTC offset for CLT?

Chile Standard Time (CLT) is at UTC-04:00. During daylight saving time, it shifts to CLST.

What should I know about the CLT timezone?

Chile observes daylight saving time, switching to CLST (UTC-03:00) in summer. Santiago is the largest city in Chile with over 6 million in the metro area.