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).

IRST to Santiago

-6h 30m

IRST

IRSTSOURCE

UTC+03:30

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Santiago

CLST

Chile · UTC-03:00☀ DST active

HH05

MM30

05:30 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

IRST

Santiago

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 CLST on the World Map

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

IRST Zone

→

CLST 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

Time Conversion Guide: IRST to Santiago

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

In practice, when it is 9:00 AM in IRST it is 2:30 AM in Santiago. Midnight in IRST is 5:30 PM in Santiago.Santiago observes daylight saving time while IRST does not, so the gap narrows or widens by an hour part of the year.

IRST to Santiago time conversion table

IRST (IRST)	Santiago (CLST)	Day
12:00 AM	5:30 PM	previous day
6:00 AM	11:30 PM	previous day
7:00 AM	12:30 AM	same day
8:00 AM	1:30 AM	same day
9:00 AM	2:30 AM	same day
12:00 PM	5:30 AM	same day
3:00 PM	8:30 AM	same day
5:00 PM	10:30 AM	same day
6:00 PM	11:30 AM	same day
9:00 PM	2:30 PM	same day

Why people convert IRST to Santiago time

Scheduling a call from IRST to Santiago: a 10:00 AM start in IRST lands at 3:30 AM in Santiago, so you can confirm the slot without doing the arithmetic yourself.
Finding shared working hours: both IRST and Santiago are inside the 9-to-5 working day between 3:30 PM and 5:00 PM IRST time (9:00 AM–10:30 AM CLST). That is roughly 1 hours 30 minutes of usable overlap.
Watching a live event or market open: IRST viewers need 2:30 AM in Santiago to catch a 9:00 AM start there, and 6:30 AM if the event is anchored to IRST.

Always state the zone abbreviation, not just the hour. "3:00 PM IRST" is unambiguous; "3 PM" across a -6h 30m gap is not.
Block 3:30 PM–5:00 PM IRST as the recurring meeting window if you work primarily from IRST and need Santiago colleagues present.
Santiago: Clocks fall back on Sun, Apr 4, 2027. Any meeting series spanning that date will shift by an hour in local time.

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 IRST and Santiago

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

Business hours overlap

IRST and Santiago overlap for only 90 minutes (3:30 PM–5:00 PM IRST), so meetings have to be booked precisely.

IRST is 6 hours 30 minutes behind Santiago (IRST UTC+03:30 → CLST UTC-03:00). The shared working window is 3:30 PM–5:00 PM IRST. Remember to re-check around daylight-saving transitions.

🕐 Daylight Saving Time Info

IRST

Does not observe DST

Santiago

☀ 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 IRST and Santiago?

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

How do I convert IRST time to Santiago time?

Add -6h 30m to IRST local time. For example, 9:00 AM in IRST is 2:30 AM in Santiago.

What time is it in Santiago right now?

Santiago uses CLST at UTC-03:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -6h 30m offset from IRST.

What is the best time to call Santiago from IRST?

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

Which is behind, IRST or Santiago?

IRST is 6 hours 30 minutes behind Santiago. When it is 12:00 PM in IRST it is 5:30 AM in Santiago.

Do IRST and Santiago use different time zones?

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

Does daylight saving time affect the IRST–Santiago difference?

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

Which other cities share IRST's time zone?

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

Which countries use IRST, IRST's zone?

IRST is used in Iran.

Is there a day difference between IRST and Santiago?

Not normally. The -6h 30m gap only pushes the date over the previous day.

What is the time difference between IRST and Santiago?

Santiago is -6h 30m from IRST.

What timezone is IRST in?

IRST operates on its local timezone.

What timezone is Santiago in?

Santiago 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.