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).

GMT to Santiago

-3h

GMT

GMTSOURCE

UTC+01:00☀ DST active

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Santiago

CLST

Chile · UTC-03:00☀ DST active

HH09

MM00

09:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

GMT

Santiago

12:00 AM

8:00 PM-1

2:00 AM

10:00 PM-1

4:00 AM

12:00 AM

6:00 AM

2:00 AM

8:00 AM

4:00 AM

10:00 AM

6:00 AM

12:00 PM

8:00 AM

2:00 PM

10:00 AM

4:00 PM

12:00 PM

6:00 PM

2:00 PM

8:00 PM

4:00 PM

10:00 PM

6:00 PM

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

GMT and CLST on the World Map

The map below highlights the GMT (Greenwich Mean Time) and CLST (Chile Standard Time) timezone regions across the globe.

GMT Zone

→

CLST Zone

Explore all world timezones interactively →

GMT – Greenwich Mean Time

UTC+00:00

Greenwich Mean Time (GMT) is the mean solar time at the Royal Observatory in Greenwich, London. It is the same as UTC+00:00.

Countries in GMT

United KingdomIrelandIcelandPortugal (mainland)GhanaSenegalMaliMauritaniaGambiaGuineaSierra LeoneLiberiaIvory CoastBurkina FasoMorocco (historically)

Major Cities in GMT

LondonDublinLisbonAccraReykjavikEdinburghCasablancaDakarBamakoAbidjanConakryFreetownMonrovia

Key Facts about GMT

•GMT is based on the Prime Meridian (0° longitude) passing through Greenwich, London.
•The Royal Observatory in Greenwich has been the reference point for GMT since 1884.
•GMT and UTC are often used interchangeably, but UTC is based on atomic clocks.
•Iceland uses GMT year-round and never observes daylight saving time.
•The UK switches from GMT to BST (British Summer Time) in late March each year.

Daylight Saving:Yes – switches to BST

Learn more about GMT 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

Understanding the -3h Gap: GMT vs Santiago

GMT runs on Greenwich Mean Time (GMT) at UTC+00:00. Santiago runs on Chile Summer Time (CLST) at UTC-03:00, also currently on daylight saving time. That puts GMT 3 hours behind Santiago — a difference of -3h at the current offsets.

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

GMT to Santiago time conversion table

GMT (GMT)	Santiago (CLST)	Day
12:00 AM	9:00 PM	previous day
6:00 AM	3:00 AM	same day
7:00 AM	4:00 AM	same day
8:00 AM	5:00 AM	same day
9:00 AM	6:00 AM	same day
12:00 PM	9:00 AM	same day
3:00 PM	12:00 PM	same day
5:00 PM	2:00 PM	same day
6:00 PM	3:00 PM	same day
9:00 PM	6:00 PM	same day

Why people convert GMT to Santiago time

Scheduling a call from GMT to Santiago: a 10:00 AM start in GMT lands at 7:00 AM in Santiago, so you can confirm the slot without doing the arithmetic yourself.
Finding shared working hours: both GMT and Santiago are inside the 9-to-5 working day between 12:00 PM and 5:00 PM GMT time (9:00 AM–2:00 PM CLST). That is roughly 5 hours of usable overlap.
Keeping family and friends in sync: knowing that 8:00 PM in GMT is 5:00 PM in Santiago makes it easy to avoid calling at 3 AM.

Always state the zone abbreviation, not just the hour. "3:00 PM GMT" is unambiguous; "3 PM" across a -3h gap is not.
Block 12:00 PM–5:00 PM GMT as the recurring meeting window if you work primarily from GMT 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 GMT (Greenwich Mean Time)

Greenwich Mean Time (GMT) is the clock time at the Royal Observatory in Greenwich, London, which sits on the Prime Meridian (0° longitude). GMT serves as the reference point from which all other time zones are calculated. The United Kingdom uses GMT during winter months and switches to British Summer Time (BST, UTC+01:00) from late March to late October. Several West African nations use GMT year-round. GMT is often used interchangeably with UTC (Coordinated Universal Time), although technically they are different – UTC is based on atomic clocks while GMT is based on Earth's rotation.

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 GMT and Santiago

Both GMT and Santiago sit inside the 9 AM – 5 PM working day between 12:00 PM–5:00 PM GMT, which is 9:00 AM–2:00 PM CLST. That gives roughly 5 hours of shared time — the safest window for a live call or meeting.

Business hours overlap

GMT and Santiago share 5 hours of working-hours overlap (12:00 PM–5:00 PM GMT), so scheduling a live meeting is straightforward.

GMT is 3 hours behind Santiago (GMT UTC+00:00 → CLST UTC-03:00). The shared working window is 12:00 PM–5:00 PM GMT. Remember to re-check around daylight-saving transitions.

🕐 Daylight Saving Time Info

GMT

☀ Currently in DST

Standard: UTC+00:00 · DST: UTC+01:00

Clocks fall back on Sun, Oct 25, 2026

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 GMT and Santiago?

GMT (GMT, UTC+00:00) is 3 hours behind Santiago (CLST, UTC-03:00). The gap is currently -3h.

How do I convert GMT time to Santiago time?

Add -3h to GMT local time. For example, 9:00 AM in GMT is 6:00 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 -3h offset from GMT.

What is the best time to call Santiago from GMT?

Call between 12:00 PM and 5:00 PM GMT — that maps to 9:00 AM–2:00 PM CLST and keeps both parties inside the working day.

Which is behind, GMT or Santiago?

GMT is 3 hours behind Santiago. When it is 12:00 PM in GMT it is 9:00 AM in Santiago.

Do GMT and Santiago use different time zones?

GMT uses GMT at UTC+00:00, while Santiago (Chile) uses CLST at UTC-03:00. The IANA identifiers are Europe/London and America/Santiago.

Does daylight saving time affect the GMT–Santiago difference?

Yes at the moment: Santiago is on daylight saving time and GMT is not, so the -3h gap shifts by an hour when exactly one of them changes clocks.

Which other cities share GMT's time zone?

GMT also covers London, Dublin, Lisbon, Accra, Reykjavik, Edinburgh, Casablanca, Dakar and 5 more.

Which countries use GMT, GMT's zone?

GMT is used in United Kingdom, Ireland, Iceland, Portugal (mainland), Ghana, Senegal, Mali, Mauritania and 7 more.

Is there a day difference between GMT and Santiago?

Not normally. The -3h gap only pushes the date over the previous day.

What is the time difference between GMT and Santiago?

Santiago is -3h from GMT.

What timezone is GMT in?

GMT operates on its local timezone.

What timezone is Santiago in?

Santiago operates on its local timezone.

Which countries use GMT (Greenwich Mean Time)?

GMT is used in United Kingdom, Ireland, Iceland, Portugal (mainland), Ghana, Senegal, and 9 more countries.

Does GMT observe daylight saving time?

Yes, GMT switches to BST during summer months.

What are some interesting facts about GMT?

GMT is based on the Prime Meridian (0° longitude) passing through Greenwich, London. The Royal Observatory in Greenwich has been the reference point for GMT since 1884.

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.