Инструменты Intosoft

Istanbul to AST

-7h

Istanbul

TRTSOURCE
Turkey · UTC+03:00
HH12
:
MM00
  
12:00 (24-hr)
12 AM6 AM12 PM6 PM12 AM

AST

AST
UTC-03:00☀ DST active
HH05
:
MM00
  
05:00 (24-hr)
12 AM6 AM12 PM6 PM12 AM
Istanbul
AST
12:00 AM
6:00 PM-1
2:00 AM
8:00 PM-1
4:00 AM
10:00 PM-1
6:00 AM
12:00 AM
8:00 AM
2:00 AM
10:00 AM
4:00 AM
12:00 PM
6:00 AM
2:00 PM
8:00 AM
4:00 PM
10:00 AM
6:00 PM
12:00 PM
8:00 PM
2:00 PM
10:00 PM
4:00 PM

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

TRT and AST on the World Map

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

TRTASTIstanbulAnkaraIzmirBursaHalifaxSan JuanSanto DomingoCaracas
TRT Zone
→
AST 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

AST – Atlantic Standard Time

UTC-04:00

Atlantic Standard Time (AST) is the time zone for the Canadian Atlantic provinces and the Caribbean, 4 hours behind UTC.

Countries in AST
Canada (Atlantic provinces)Puerto RicoUS Virgin IslandsDominican RepublicVenezuelaBoliviaBarbadosTrinidad and Tobago
Major Cities in AST
HalifaxSan JuanSanto DomingoCaracasLa PazFrederictonCharlottetown
Key Facts about AST
  • •Puerto Rico uses AST year-round and does not observe DST.
  • •AST is 1 hour ahead of EST.
  • •Halifax, the capital of Nova Scotia, is the largest city in AST Canada.
Daylight Saving:Yes – switches to ADT
Learn more about AST 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 →

Time Conversion Guide: Istanbul to AST

Istanbul runs on Türkiye Standard Time (TRT) at UTC+03:00. AST runs on Atlantic Standard Time (AST) at UTC-04:00. That puts Istanbul 7 hours behind AST — a difference of -7h at the current offsets.

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

Istanbul to AST time conversion table

Istanbul (TRT)AST (AST)Day
12:00 AM5:00 PMprevious day
6:00 AM11:00 PMprevious day
7:00 AM12:00 AMsame day
8:00 AM1:00 AMsame day
9:00 AM2:00 AMsame day
12:00 PM5:00 AMsame day
3:00 PM8:00 AMsame day
5:00 PM10:00 AMsame day
6:00 PM11:00 AMsame day
9:00 PM2:00 PMsame day

Why people convert Istanbul to AST time

  • Scheduling a call from Istanbul to AST: a 10:00 AM start in Istanbul lands at 3:00 AM in AST, so you can confirm the slot without doing the arithmetic yourself.
  • Finding shared working hours: both Istanbul and AST are inside the 9-to-5 working day between 4:00 PM and 5:00 PM TRT time (9:00 AM–10:00 AM AST). That is roughly 1 hours of usable overlap.
  • Watching a live event or market open: Istanbul viewers need 2:00 AM in AST to catch a 9:00 AM start there, and 7:00 AM if the event is anchored to Istanbul.
  • Always state the zone abbreviation, not just the hour. "3:00 PM TRT" is unambiguous; "3 PM" across a -7h gap is not.
  • Block 4:00 PM–5:00 PM TRT as the recurring meeting window if you work primarily from Istanbul and need AST 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 AST (Atlantic Standard Time)

Atlantic Standard Time (AST) covers Canada's Atlantic provinces (Nova Scotia, New Brunswick, Prince Edward Island, and most of Labrador), as well as several Caribbean nations. Puerto Rico and the US Virgin Islands use AST year-round without daylight saving time. The Canadian provinces switch to Atlantic Daylight Time (ADT) in summer.

Best time to call between Istanbul and AST

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

Business hours overlap

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

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

🕐 Daylight Saving Time Info

Istanbul

Does not observe DST

AST

☀ Currently in DST

Standard: UTC-04:00 · DST: UTC-03:00

Clocks fall back on Sun, Nov 1, 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 Istanbul and AST?

Istanbul (TRT, UTC+03:00) is 7 hours behind AST (AST, UTC-04:00). The gap is currently -7h.

How do I convert Istanbul time to AST time?

Add -7h to Istanbul local time. For example, 9:00 AM in Istanbul is 2:00 AM in AST.

What time is it in AST right now?

AST uses AST at UTC-04:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -7h offset from Istanbul.

What is the best time to call AST from Istanbul?

Call between 4:00 PM and 5:00 PM TRT — that maps to 9:00 AM–10:00 AM AST and keeps both parties inside the working day.

Which is behind, Istanbul or AST?

Istanbul is 7 hours behind AST. When it is 12:00 PM in Istanbul it is 5:00 AM in AST.

Do Istanbul and AST use different time zones?

Istanbul (Turkey) uses TRT at UTC+03:00, while AST uses AST at UTC-04:00. The IANA identifiers are Europe/Istanbul and America/Halifax.

Does daylight saving time affect the Istanbul–AST difference?

Neither zone observes daylight saving time, so the -7h offset between Istanbul and AST 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 AST?

Not normally. The -7h gap only pushes the date over the previous day.

What is the time difference between Istanbul and AST?

AST is -7h 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 AST in?

AST 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 AST timezone?

Major cities in the AST timezone include Halifax, San Juan, Santo Domingo, Caracas, La Paz, Fredericton, Charlottetown.

What is the UTC offset for AST?

Atlantic Standard Time (AST) is at UTC-04:00. During daylight saving time, it shifts to ADT.

What should I know about the AST timezone?

Puerto Rico uses AST year-round and does not observe DST. AST is 1 hour ahead of EST.

When is it midnight in Istanbul, what time is it in AST?

When it is 12:00 AM (midnight) in Istanbul (TRT), it is -7h later in AST (AST).

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