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 BRT

-7h

GST

GSTSOURCE

UTC+04:00

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

BRT

UTC-03:00

HH05

MM00

05:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

GST

BRT

12:00 AM

5:00 PM-1

2:00 AM

7:00 PM-1

4:00 AM

9:00 PM-1

6:00 AM

11:00 PM-1

8:00 AM

1:00 AM

10:00 AM

3:00 AM

12:00 PM

5:00 AM

2:00 PM

7:00 AM

4:00 PM

9:00 AM

6:00 PM

11:00 AM

8:00 PM

1:00 PM

10:00 PM

3:00 PM

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

GST and BRT on the World Map

The map below highlights the GST (Gulf Standard Time) and BRT (Brasilia Time) timezone regions across the globe.

GST Zone

→

BRT 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

BRT – Brasilia Time

UTC-03:00

Brasilia Time (BRT) is the time zone for eastern Brazil, 3 hours behind UTC.

Countries in BRT

Brazil (eastern)

Major Cities in BRT

São PauloRio de JaneiroBrasíliaBelo HorizonteSalvadorFortalezaRecifeCuritiba

Key Facts about BRT

•Brazil abolished daylight saving time in 2019.
•São Paulo is the largest city in the Southern Hemisphere.
•BRT is 2 hours ahead of EST.
•Brazil spans four different time zones.
•The B3 stock exchange in São Paulo operates on BRT.

Daylight Saving:No – UTC-03:00 year-round

Learn more about BRT on Wikipedia

Time Conversion Guide: GST to BRT

GST runs on Gulf Standard Time (GST) at UTC+04:00. BRT runs on Brasilia Time (BRT) at UTC-03:00. That puts GST 7 hours behind BRT — a difference of -7h at the current offsets.

In practice, when it is 9:00 AM in GST it is 2:00 AM in BRT. Midnight in GST is 5:00 PM in BRT. Neither zone observes daylight saving time, so the offset between them stays constant all year.

GST to BRT time conversion table

GST (GST)	BRT (BRT)	Day
12:00 AM	5:00 PM	previous day
6:00 AM	11:00 PM	previous day
7:00 AM	12:00 AM	same day
8:00 AM	1:00 AM	same day
9:00 AM	2:00 AM	same day
12:00 PM	5:00 AM	same day
3:00 PM	8:00 AM	same day
5:00 PM	10:00 AM	same day
6:00 PM	11:00 AM	same day
9:00 PM	2:00 PM	same day

Why people convert GST to BRT time

Scheduling a call from GST to BRT: a 10:00 AM start in GST lands at 3:00 AM in BRT, so you can confirm the slot without doing the arithmetic yourself.
Finding shared working hours: both GST and BRT are inside the 9-to-5 working day between 4:00 PM and 5:00 PM GST time (9:00 AM–10:00 AM BRT). That is roughly 1 hours of usable overlap.
Coordinating a GST-based team with BRT 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 -7h gap is not.
Block 4:00 PM–5:00 PM GST as the recurring meeting window if you work primarily from GST and need BRT 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 BRT (Brasilia Time)

Brasilia Time (BRT) is the standard time in the most populous regions of Brazil, including São Paulo, Rio de Janeiro, and the capital Brasília. Brazil abolished daylight saving time in 2019, so BRT is now observed year-round in these regions. Brazil spans four time zones in total.

Best time to call between GST and BRT

Both GST and BRT sit inside the 9 AM – 5 PM working day between 4:00 PM–5:00 PM GST, which is 9:00 AM–10:00 AM BRT. That gives roughly 1 hours of shared time — the safest window for a live call or meeting.

Business hours overlap

GST and BRT overlap for only 60 minutes (4:00 PM–5:00 PM GST), so meetings have to be booked precisely.

GST is 7 hours behind BRT (GST UTC+04:00 → BRT UTC-03:00). The shared working window is 4:00 PM–5:00 PM GST. Remember to re-check around daylight-saving transitions.