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 BST

-3h

GST

GSTSOURCE

UTC+04:00

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

BST

UTC+01:00☀ DST active

HH09

MM00

09:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

GST

BST

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 BST on the World Map

The map below highlights the GST (Gulf Standard Time) and BST (British Summer Time) timezone regions across the globe.

GST Zone

→

BST 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

BST – British Summer Time

UTC+01:00

British Summer Time (BST, UTC+01:00) is the daylight saving period in the United Kingdom, running from late March to late October.

Countries in BST

United Kingdom

Major Cities in BST

LondonBirminghamManchesterGlasgowEdinburghCardiffBelfastLiverpoolBristolLeeds

Key Facts about BST

•BST runs from the last Sunday in March to the last Sunday in October.
•BST is exactly one hour ahead of GMT, the UK's standard time.
•During BST, London is 4 hours ahead of New York while the US is on Eastern Daylight Time.
•The Isle of Man and the Channel Islands also observe BST.

Daylight Saving:Yes – switches to BST

Learn more about BST on Wikipedia

GST to BST Time Difference – Complete Guide

GST runs on Gulf Standard Time (GST) at UTC+04:00. BST runs on British Summer Time (BST) at UTC+01:00. That puts GST 3 hours behind BST — a difference of -3h at the current offsets.

In practice, when it is 9:00 AM in GST it is 6:00 AM in BST. Midnight in GST is 9:00 PM in BST. Neither zone observes daylight saving time, so the offset between them stays constant all year.

GST to BST time conversion table

GST (GST)	BST (BST)	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 GST to BST time

Scheduling a call from GST to BST: a 10:00 AM start in GST lands at 7:00 AM in BST, so you can confirm the slot without doing the arithmetic yourself.
Finding shared working hours: both GST and BST are inside the 9-to-5 working day between 12:00 PM and 5:00 PM GST time (9:00 AM–2:00 PM BST). That is roughly 5 hours of usable overlap.
Coordinating a GST-based team with BST 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 -3h gap is not.
Block 12:00 PM–5:00 PM GST as the recurring meeting window if you work primarily from GST and need BST 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 BST (British Summer Time)

British Summer Time (BST) is the daylight saving period in the United Kingdom, when clocks move one hour forward from Greenwich Mean Time (GMT, UTC+00:00) to UTC+01:00. It runs from the last Sunday in March to the last Sunday in October. England, Scotland, Wales and Northern Ireland all follow it, along with the Isle of Man and the Channel Islands of Jersey and Guernsey. During BST, London is one hour ahead of UTC, four hours ahead of New York on Eastern Daylight Time, and five hours ahead of New York once the United States returns to Eastern Standard Time in November. BST is also used to abbreviate Bangladesh Standard Time (UTC+06:00), which is listed separately on this site.

Best time to call between GST and BST

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

Business hours overlap

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

GST is 3 hours behind BST (GST UTC+04:00 → BST UTC+01:00). The shared working window is 12:00 PM–5:00 PM GST. Remember to re-check around daylight-saving transitions.