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.

Santiago to Tehran

+6h 30m

Santiago

CLSTSOURCE

Chile · UTC-03:00☀ DST active

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Tehran

IRST

Iran · UTC+03:30

HH06

MM30

18:30 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

Santiago

Tehran

12:00 AM

6:30 AM

2:00 AM

8:30 AM

4:00 AM

10:30 AM

6:00 AM

12:30 PM

8:00 AM

2:30 PM

10:00 AM

4:30 PM

12:00 PM

6:30 PM

2:00 PM

8:30 PM

4:00 PM

10:30 PM

6:00 PM

12:30 AM+1

8:00 PM

2:30 AM+1

10:00 PM

4:30 AM+1

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

CLST and IRST on the World Map

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

CLST Zone

→

IRST Zone

Explore all world timezones interactively →

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

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

About Tehran

Wikipedia

Tehran operates on Iran Standard Time (IRST), UTC+3:30. Iran's unique half-hour offset makes Tehran time distinctive for regional business coordination.

Population:9.4 million

Metro:16.8 million

Business Hours:8:00 AM - 4:00 PM IRST

Currency:IRR (﷼)

Stock Exchange:TSE (Tehran Stock Exchange)

Key Landmarks

Azadi TowerGolestan PalaceGrand BazaarMilad TowerTabiat Bridge

Did You Know?

Iran Standard Time (IRST) is one of few timezones with a 30-minute offset (UTC+3:30).

Learn more about IRST timezone →

Time Conversion Guide: Santiago to Tehran

Santiago runs on Chile Summer Time (CLST) at UTC-03:00, currently observing daylight saving time. Tehran runs on Iran Standard Time (IRST) at UTC+03:30. That puts Santiago 6 hours 30 minutes ahead of Tehran — a difference of +6h 30m at the current offsets.

In practice, when it is 9:00 AM in Santiago it is 3:30 PM in Tehran. Midnight in Santiago is 6:30 AM in Tehran.Santiago observes daylight saving time while Tehran does not, so the gap narrows or widens by an hour part of the year.

Santiago to Tehran time conversion table

Santiago (CLST)	Tehran (IRST)	Day
12:00 AM	6:30 AM	same day
6:00 AM	12:30 PM	same day
7:00 AM	1:30 PM	same day
8:00 AM	2:30 PM	same day
9:00 AM	3:30 PM	same day
12:00 PM	6:30 PM	same day
3:00 PM	9:30 PM	same day
5:00 PM	11:30 PM	same day
6:00 PM	12:30 AM	next day
9:00 PM	3:30 AM	next day

Why people convert Santiago to Tehran time

Scheduling a call from Santiago to Tehran: a 10:00 AM start in Santiago lands at 4:30 PM in Tehran, so you can confirm the slot without doing the arithmetic yourself.
Finding shared working hours: both Santiago and Tehran are inside the 9-to-5 working day between 9:00 AM and 10:30 AM CLST time (3:30 PM–5:00 PM IRST). That is roughly 1 hours 30 minutes of usable overlap.
Keeping family and friends in sync: knowing that 8:00 PM in Santiago is 2:30 AM in Tehran makes it easy to avoid calling at 3 AM.

Always state the zone abbreviation, not just the hour. "3:00 PM CLST" is unambiguous; "3 PM" across a +6h 30m gap is not.
Block 9:00 AM–10:30 AM CLST as the recurring meeting window if you work primarily from Santiago and need Tehran colleagues present.
Santiago: Clocks fall back on Sun, Apr 4, 2027. Re-check this page after that date because the offset changes and so does the +6h 30m gap.

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.

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.

Best time to call between Santiago and Tehran

Both Santiago and Tehran sit inside the 9 AM – 5 PM working day between 9:00 AM–10:30 AM CLST, which is 3:30 PM–5:00 PM IRST. That gives roughly 1 hours and 30 minutes of shared time — the safest window for a live call or meeting.

Business hours overlap

Santiago and Tehran overlap for only 90 minutes (9:00 AM–10:30 AM CLST), so meetings have to be booked precisely.

Santiago is 6 hours 30 minutes ahead of Tehran (CLST UTC-03:00 → IRST UTC+03:30). The shared working window is 9:00 AM–10:30 AM CLST. Remember to re-check around daylight-saving transitions.

🕐 Daylight Saving Time Info

Santiago

☀ Currently in DST

Standard: UTC-04:00 · DST: UTC-03:00

Clocks fall back on Sun, Apr 4, 2027

Tehran

Does not observe DST

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 Santiago and Tehran?

Santiago (CLST, UTC-03:00) is 6 hours 30 minutes ahead of Tehran (IRST, UTC+03:30). The gap is currently +6h 30m.

How do I convert Santiago time to Tehran time?

Add +6h 30m to Santiago local time. For example, 9:00 AM in Santiago is 3:30 PM in Tehran.

What time is it in Tehran right now?

Tehran uses IRST at UTC+03:30. Use the live converter at the top of this page — it updates in real time and already accounts for the +6h 30m offset from Santiago.

What is the best time to call Tehran from Santiago?

Call between 9:00 AM and 10:30 AM CLST — that maps to 3:30 PM–5:00 PM IRST and keeps both parties inside the working day.

Which is ahead, Santiago or Tehran?

Santiago is 6 hours 30 minutes ahead of Tehran. When it is 12:00 PM in Santiago it is 6:30 PM in Tehran.

Do Santiago and Tehran use different time zones?

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

Does daylight saving time affect the Santiago–Tehran difference?

Yes at the moment: Santiago is on daylight saving time and Tehran is not, so the +6h 30m gap shifts by an hour when exactly one of them changes clocks.

Which other cities share Santiago's time zone?

CLST also covers Santiago, Valparaíso, Concepción, Viña del Mar, Antofagasta.

Which countries use CLST, Santiago's zone?

CLST is used in Chile.

Is there a day difference between Santiago and Tehran?

Not normally. The +6h 30m gap only pushes the date over for late-evening times.

What is the time difference between Santiago and Tehran?

Tehran is +6h 30m from Santiago.

What timezone is Santiago in?

Santiago operates on its local timezone.

What timezone is Tehran in?

Tehran operates on Iran Standard Time (IRST), UTC+3:30. Iran's unique half-hour offset makes Tehran time distinctive for regional business coordination.

What are the business hours in Tehran?

Standard business hours in Tehran are 8:00 AM - 4:00 PM IRST.

Which countries use CLT (Chile Standard Time)?

CLT is used in Chile.

Does CLT observe daylight saving time?

Yes, CLT switches to CLST during summer months.

What are some interesting 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.