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).

GST to GMT

-4h

GST

GSTSOURCE

UTC+04:00

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

GMT

UTC+01:00☀ DST active

HH08

MM00

08:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

GST

GMT

12:00 AM

9:00 PM-1

2:00 AM

11:00 PM-1

4:00 AM

1:00 AM

6:00 AM

3:00 AM

8:00 AM

5:00 AM

10:00 AM

7:00 AM

12:00 PM

9:00 AM

2:00 PM

11:00 AM

4:00 PM

1:00 PM

6:00 PM

3:00 PM

8:00 PM

5:00 PM

10:00 PM

7:00 PM

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

GST and GMT on the World Map

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

GST Zone

→

GMT Zone

Explore all world timezones interactively →

GST – Gulf Standard Time

UTC+04:00

Gulf Standard Time (GST) is used in the UAE, Oman, and other Gulf states, 4 hours ahead of UTC.

Countries in GST

UAEOmanGeorgiaAzerbaijanMauritius

Major Cities in GST

DubaiAbu DhabiMuscatBakuTbilisi

Key Facts about GST

•Dubai uses GST year-round with no daylight saving time.
•GST is 9 hours ahead of EST and 4 hours ahead of GMT.
•The Dubai Financial Market (DFM) operates on GST.

Daylight Saving:No – UTC+04:00 year-round

Learn more about GST 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

GST vs GMT: Offsets, DST and Best Call Times

GST runs on Gulf Standard Time (GST) at UTC+04:00. GMT runs on Greenwich Mean Time (GMT) at UTC+00:00. That puts GST 4 hours behind GMT — a difference of -4h at the current offsets.

In practice, when it is 9:00 AM in GST it is 5:00 AM in GMT. Midnight in GST is 8:00 PM in GMT. Neither zone observes daylight saving time, so the offset between them stays constant all year.

GST to GMT time conversion table

GST (GST)	GMT (GMT)	Day
12:00 AM	8:00 PM	previous day
6:00 AM	2:00 AM	same day
7:00 AM	3:00 AM	same day
8:00 AM	4:00 AM	same day
9:00 AM	5:00 AM	same day
12:00 PM	8:00 AM	same day
3:00 PM	11:00 AM	same day
5:00 PM	1:00 PM	same day
6:00 PM	2:00 PM	same day
9:00 PM	5:00 PM	same day

Why people convert GST to GMT time

Scheduling a call from GST to GMT: a 10:00 AM start in GST lands at 6:00 AM in GMT, so you can confirm the slot without doing the arithmetic yourself.
Finding shared working hours: both GST and GMT are inside the 9-to-5 working day between 1:00 PM and 5:00 PM GST time (9:00 AM–1:00 PM GMT). That is roughly 4 hours of usable overlap.
Coordinating a GST-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 GST" is unambiguous; "3 PM" across a -4h gap is not.
Block 1:00 PM–5:00 PM GST as the recurring meeting window if you work primarily from GST and need GMT colleagues present.

About GST (Gulf Standard Time)

Gulf Standard Time (GST) is the time zone used in the United Arab Emirates, Oman, and other Gulf states. GST does not observe daylight saving time. Dubai and Abu Dhabi, major international business and tourism hubs, operate on GST.

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 GST and GMT

Both GST and GMT sit inside the 9 AM – 5 PM working day between 1:00 PM–5:00 PM GST, which is 9:00 AM–1:00 PM GMT. That gives roughly 4 hours of shared time — the safest window for a live call or meeting.

Business hours overlap

GST and GMT overlap for about 4 hours during the working day — enough for meetings if you avoid the edges of the window.

GST is 4 hours behind GMT (GST UTC+04:00 → GMT UTC+00:00). The shared working window is 1:00 PM–5:00 PM GST. Remember to re-check around daylight-saving transitions.

🕐 Daylight Saving Time Info

GST

Does not observe DST

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 GST and GMT?

GST (GST, UTC+04:00) is 4 hours behind GMT (GMT, UTC+00:00). The gap is currently -4h.

How do I convert GST time to GMT time?

Add -4h to GST local time. For example, 9:00 AM in GST is 5:00 AM 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 -4h offset from GST.

What is the best time to call GMT from GST?

Call between 1:00 PM and 5:00 PM GST — that maps to 9:00 AM–1:00 PM GMT and keeps both parties inside the working day.

Which is behind, GST or GMT?

GST is 4 hours behind GMT. When it is 12:00 PM in GST it is 8:00 AM in GMT.

Does daylight saving time affect the GST–GMT difference?

Neither zone observes daylight saving time, so the -4h offset between GST and GMT is fixed all year.

Which other cities share GST's time zone?

GST also covers Dubai, Abu Dhabi, Muscat, Baku, Tbilisi.

Which countries use GST, GST's zone?

GST is used in UAE, Oman, Georgia, Azerbaijan, Mauritius.

Is there a day difference between GST and GMT?

Not normally. The -4h gap only pushes the date over the previous day.

What is the time difference between GST and GMT?

GMT is -4h from GST.

What timezone is GST in?

GST operates on its local timezone.

What timezone is GMT in?

GMT operates on its local timezone.

Which countries use GST (Gulf Standard Time)?

GST is used in UAE, Oman, Georgia, Azerbaijan, Mauritius.

Does GST observe daylight saving time?

No, GST does not observe daylight saving time and remains at UTC+04:00 year-round.

What are some interesting facts about GST?

Dubai uses GST year-round with no daylight saving time. GST is 9 hours ahead of EST and 4 hours ahead of GMT.

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.