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).

Santiago to GMT

+3h

Santiago

CLSTSOURCE

Chile · UTC-03:00☀ DST active

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

GMT

UTC+01:00☀ DST active

HH03

MM00

15:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

Santiago

GMT

12:00 AM

4:00 AM

2:00 AM

6:00 AM

4:00 AM

8:00 AM

6:00 AM

10:00 AM

8:00 AM

12:00 PM

10:00 AM

2:00 PM

12:00 PM

4:00 PM

2:00 PM

6:00 PM

4:00 PM

8:00 PM

6:00 PM

10:00 PM

8:00 PM

12:00 AM+1

10:00 PM

2:00 AM+1

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

CLST and GMT on the World Map

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

CLST Zone

→

GMT 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

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

Santiago vs GMT: Offsets, DST and Best Call Times

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

In practice, when it is 9:00 AM in Santiago it is 12:00 PM in GMT. Midnight in Santiago is 3:00 AM in GMT.Santiago observes daylight saving time while GMT does not, so the gap narrows or widens by an hour part of the year.

Santiago to GMT time conversion table

Santiago (CLST)	GMT (GMT)	Day
12:00 AM	3:00 AM	same day
6:00 AM	9:00 AM	same day
7:00 AM	10:00 AM	same day
8:00 AM	11:00 AM	same day
9:00 AM	12:00 PM	same day
12:00 PM	3:00 PM	same day
3:00 PM	6:00 PM	same day
5:00 PM	8:00 PM	same day
6:00 PM	9:00 PM	same day
9:00 PM	12:00 AM	next day

Why people convert Santiago to GMT time

Scheduling a call from Santiago to GMT: a 10:00 AM start in Santiago lands at 1:00 PM in GMT, so you can confirm the slot without doing the arithmetic yourself.
Finding shared working hours: both Santiago and GMT are inside the 9-to-5 working day between 9:00 AM and 2:00 PM CLST time (12:00 PM–5:00 PM GMT). That is roughly 5 hours of usable overlap.
Coordinating a Santiago-based team with GMT contacts: quoting times in the other side's local clock — not your own — removes the single biggest source of missed meetings.

Always state the zone abbreviation, not just the hour. "3:00 PM CLST" is unambiguous; "3 PM" across a +3h gap is not.
Block 9:00 AM–2:00 PM CLST as the recurring meeting window if you work primarily from Santiago and need GMT 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 +3h 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 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.

Best time to call between Santiago and GMT

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

Business hours overlap

Santiago and GMT share 5 hours of working-hours overlap (9:00 AM–2:00 PM CLST), so scheduling a live meeting is straightforward.

Santiago is 3 hours ahead of GMT (CLST UTC-03:00 → GMT UTC+00:00). The shared working window is 9:00 AM–2:00 PM 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

GMT

☀ Currently in DST

Standard: UTC+00:00 · DST: UTC+01:00

Clocks fall back on Sun, Oct 25, 2026

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 GMT?

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

How do I convert Santiago time to GMT time?

Add +3h to Santiago local time. For example, 9:00 AM in Santiago is 12:00 PM in GMT.

What time is it in GMT right now?

GMT uses GMT at UTC+00:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +3h offset from Santiago.

What is the best time to call GMT from Santiago?

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

Which is ahead, Santiago or GMT?

Santiago is 3 hours ahead of GMT. When it is 12:00 PM in Santiago it is 3:00 PM in GMT.

Do Santiago and GMT use different time zones?

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

Does daylight saving time affect the Santiago–GMT 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 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 GMT?

Not normally. The +3h gap only pushes the date over for late-evening times.

What is the time difference between Santiago and GMT?

GMT is +3h from Santiago.

What timezone is Santiago in?

Santiago operates on its local timezone.

What timezone is GMT in?

GMT operates on its local timezone.

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.

Which cities are in the GMT timezone?

Major cities in the GMT timezone include London, Dublin, Lisbon, Accra, Reykjavik, Edinburgh, Casablanca, Dakar.

What is the UTC offset for GMT?

Greenwich Mean Time (GMT) is at UTC+00:00. During daylight saving time, it shifts to BST.

What should I know about the GMT timezone?

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.