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).

Istanbul to BDST

+3h

Istanbul

TRTSOURCE

Turkey · UTC+03:00

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

BDST

UTC+06:00

HH03

MM00

15:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

Istanbul

BDST

12:00 AM

3:00 AM

2:00 AM

5:00 AM

4:00 AM

7:00 AM

6:00 AM

9:00 AM

8:00 AM

11:00 AM

10:00 AM

1:00 PM

12:00 PM

3:00 PM

2:00 PM

5:00 PM

4:00 PM

7:00 PM

6:00 PM

9:00 PM

8:00 PM

11:00 PM

10:00 PM

1:00 AM+1

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

TRT and BDST on the World Map

The map below highlights the TRT (Turkey Time) and BDST (Bangladesh Standard Time) timezone regions across the globe.

TRT Zone

→

BDST Zone

Explore all world timezones interactively →

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

BDST – Bangladesh Standard Time

UTC+06:00

Bangladesh Standard Time (BDST, UTC+06:00) is the time zone for Bangladesh, 6 hours ahead of UTC.

Countries in BDST

Bangladesh

Major Cities in BDST

DhakaChittagongKhulnaRajshahiSylhet

Key Facts about BDST

•Bangladesh uses a single time zone, UTC+06:00, across the entire country.
•Bangladesh does not observe daylight saving time, so the offset is fixed all year.
•Dhaka is one of the most densely populated cities globally.
•BDST is written here to distinguish it from British Summer Time (BST).

Daylight Saving:No – UTC+06:00 year-round

Learn more about BDST on Wikipedia

About Istanbul

Wikipedia

Istanbul operates on Turkey Time (TRT), UTC+3 year-round. As a transcontinental city, Istanbul bridges European and Asian business hours.

Population:15.5 million

Metro:15.8 million

Business Hours:9:00 AM - 6:00 PM TRT

Currency:TRY (₺)

Stock Exchange:Borsa Istanbul

Key Landmarks

Hagia SophiaBlue MosqueTopkapi PalaceGrand BazaarGalata Tower

Did You Know?

The Grand Bazaar is one of the world's oldest and largest covered markets with 4,000+ shops.

Learn more about TRT timezone →

Istanbul to BDST Time Difference – Complete Guide

Istanbul runs on Türkiye Standard Time (TRT) at UTC+03:00. BDST runs on Bangladesh Standard Time (BDST) at UTC+06:00. That puts Istanbul 3 hours ahead of BDST — a difference of +3h at the current offsets.

In practice, when it is 9:00 AM in Istanbul it is 12:00 PM in BDST. Midnight in Istanbul is 3:00 AM in BDST. Neither zone observes daylight saving time, so the offset between them stays constant all year.

Istanbul to BDST time conversion table

Istanbul (TRT)	BDST (BDST)	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 Istanbul to BDST time

Scheduling a call from Istanbul to BDST: a 10:00 AM start in Istanbul lands at 1:00 PM in BDST, so you can confirm the slot without doing the arithmetic yourself.
Finding shared working hours: both Istanbul and BDST are inside the 9-to-5 working day between 9:00 AM and 2:00 PM TRT time (12:00 PM–5:00 PM BDST). That is roughly 5 hours of usable overlap.
Booking travel or deliveries: tracking BDST local time against Istanbul keeps pickup windows and arrival estimates honest across the +3h offset.

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

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.

About BDST (Bangladesh Standard Time)

Bangladesh Standard Time (BDST) is the single time zone used across Bangladesh, fixed at UTC+06:00 all year. Bangladesh has not observed daylight saving time since a short-lived experiment in 2009, so the gap between Bangladesh and every other zone is constant. Dhaka, the capital, is one of the most densely populated cities in the world. Because the country sits close to the middle of the UTC+06:00 band, solar noon is near 12:00 for most of the year. BDST is listed separately from British Summer Time, which shares the BST abbreviation but is UTC+01:00.

Best time to call between Istanbul and BDST

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

Business hours overlap

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

Istanbul is 3 hours ahead of BDST (TRT UTC+03:00 → BDST UTC+06:00). The shared working window is 9:00 AM–2:00 PM TRT. Remember to re-check around daylight-saving transitions.

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 Istanbul and BDST?

Istanbul (TRT, UTC+03:00) is 3 hours ahead of BDST (BDST, UTC+06:00). The gap is currently +3h.

How do I convert Istanbul time to BDST time?

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

What time is it in BDST right now?

BDST uses BDST at UTC+06:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +3h offset from Istanbul.

What is the best time to call BDST from Istanbul?

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

Which is ahead, Istanbul or BDST?

Istanbul is 3 hours ahead of BDST. When it is 12:00 PM in Istanbul it is 3:00 PM in BDST.

Do Istanbul and BDST use different time zones?

Istanbul (Turkey) uses TRT at UTC+03:00, while BDST uses BDST at UTC+06:00. The IANA identifiers are Europe/Istanbul and Asia/Dhaka.

Does daylight saving time affect the Istanbul–BDST difference?

Neither zone observes daylight saving time, so the +3h offset between Istanbul and BDST is fixed all year.

Which other cities share Istanbul's time zone?

TRT also covers Istanbul, Ankara, Izmir, Bursa, Antalya.

Which countries use TRT, Istanbul's zone?

TRT is used in Turkey.

Is there a day difference between Istanbul and BDST?

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

What is the time difference between Istanbul and BDST?

BDST is +3h from Istanbul.

What timezone is Istanbul in?

Istanbul operates on Turkey Time (TRT), UTC+3 year-round. As a transcontinental city, Istanbul bridges European and Asian business hours.

What timezone is BDST in?

BDST operates on its local timezone.

What are the business hours in Istanbul?

Standard business hours in Istanbul are 9:00 AM - 6:00 PM TRT.

Which countries use TRT (Turkey Time)?

TRT is used in Turkey.

Does TRT observe daylight saving time?

No, TRT does not observe daylight saving time and remains at UTC+03:00 year-round.

What are some interesting 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.

Which cities are in the BDST timezone?

Major cities in the BDST timezone include Dhaka, Chittagong, Khulna, Rajshahi, Sylhet.

What is the UTC offset for BDST?

Bangladesh Standard Time (BDST) is at UTC+06:00.

What should I know about the BDST timezone?

Bangladesh uses a single time zone, UTC+06:00, across the entire country. Bangladesh does not observe daylight saving time, so the offset is fixed all year.