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).

BST to TRT

+2h

BST

BSTSOURCE

UTC+01:00☀ DST active

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

TRT

UTC+03:00

HH02

MM00

14:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

BST

TRT

12:00 AM

2:00 AM

4:00 AM

6:00 AM

8:00 AM

10:00 AM

12:00 PM

2:00 PM

4:00 PM

6:00 PM

8:00 PM

10:00 PM

12:00 AM+1

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

BST and TRT on the World Map

The map below highlights the BST (British Summer Time) and TRT (Turkey Time) timezone regions across the globe.

BST Zone

→

TRT Zone

Explore all world timezones interactively →

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

TRT – Turkey Time

UTC+03:00

Turkey Time (TRT, UTC+03:00) is the single time zone used across Turkey, fixed year round since 2016.

Countries in TRT

Turkey

Major Cities in TRT

IstanbulAnkaraIzmirBursaAntalya

Key Facts about TRT

•Turkey has used a permanent UTC+03:00 since September 2016.
•TRT is level with Moscow Standard Time and Arabia Standard Time all year.
•Because Turkey kept summer time permanently, western cities see very late winter sunrises.
•Turkey previously observed daylight saving time from 1973 to 2016.

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

Learn more about TRT on Wikipedia

Comparing Time Zones: BST and TRT

BST runs on British Summer Time (BST) at UTC+01:00. TRT runs on Turkey Time (TRT) at UTC+03:00. That puts BST 2 hours ahead of TRT — a difference of +2h at the current offsets.

In practice, when it is 9:00 AM in BST it is 11:00 AM in TRT. Midnight in BST is 2:00 AM in TRT. Neither zone observes daylight saving time, so the offset between them stays constant all year.

BST to TRT time conversion table

BST (BST)	TRT (TRT)	Day
12:00 AM	2:00 AM	same day
6:00 AM	8:00 AM	same day
7:00 AM	9:00 AM	same day
8:00 AM	10:00 AM	same day
9:00 AM	11:00 AM	same day
12:00 PM	2:00 PM	same day
3:00 PM	5:00 PM	same day
5:00 PM	7:00 PM	same day
6:00 PM	8:00 PM	same day
9:00 PM	11:00 PM	same day

Why people convert BST to TRT time

Scheduling a call from BST to TRT: a 10:00 AM start in BST lands at 12:00 PM in TRT, so you can confirm the slot without doing the arithmetic yourself.
Finding shared working hours: both BST and TRT are inside the 9-to-5 working day between 9:00 AM and 3:00 PM BST time (11:00 AM–5:00 PM TRT). That is roughly 6 hours of usable overlap.
Booking travel or deliveries: tracking TRT local time against BST keeps pickup windows and arrival estimates honest across the +2h offset.

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

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.

About TRT (Turkey Time)

Turkey Time (TRT) is fixed at UTC+03:00 all year. Turkey abolished seasonal clock changes in September 2016, moving to a permanent UTC+03:00 so the whole country stays on what was formerly summer time. That leaves Istanbul, which sits close to 29°E, on an offset well ahead of its solar time — sunrise in mid-winter comes after 08:30 local. TRT shares its offset with Moscow Standard Time, Arabia Standard Time and East Africa Time, so Istanbul is level with Moscow and Riyadh all year and one hour ahead of Central European Time during the European winter.

Best time to call between BST and TRT

Both BST and TRT sit inside the 9 AM – 5 PM working day between 9:00 AM–3:00 PM BST, which is 11:00 AM–5:00 PM TRT. That gives roughly 6 hours of shared time — the safest window for a live call or meeting.

Business hours overlap

BST and TRT share 6 hours of working-hours overlap (9:00 AM–3:00 PM BST), so scheduling a live meeting is straightforward.

BST is 2 hours ahead of TRT (BST UTC+01:00 → TRT UTC+03:00). The shared working window is 9:00 AM–3:00 PM BST. Remember to re-check around daylight-saving transitions.