TRT to AST
-7hTRT
TRTSOURCEAST
ASTGreen 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.
TRT – Turkey Time
UTC+03:00Turkey Time (TRT, UTC+03:00) is the single time zone used across Turkey, fixed year round since 2016.
- •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.
AST – Atlantic Standard Time
UTC-04:00Atlantic Standard Time (AST) is the time zone for the Canadian Atlantic provinces and the Caribbean, 4 hours behind UTC.
- •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.
Understanding the -7h Gap: TRT vs AST
TRT runs on Turkey Time (TRT) at UTC+03:00. AST runs on Atlantic Standard Time (AST) at UTC-04:00. That puts TRT 7 hours behind AST — a difference of -7h at the current offsets.
In practice, when it is 9:00 AM in TRT it is 2:00 AM in AST. Midnight in TRT is 5:00 PM in AST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
TRT to AST time conversion table
| TRT (TRT) | AST (AST) | 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 TRT to AST time
- Scheduling a call from TRT to AST: a 10:00 AM start in TRT lands at 3:00 AM in AST, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both TRT 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.
- Coordinating a TRT-based team with AST 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 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 TRT 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 TRT and AST
Both TRT 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
TRT and AST overlap for only 60 minutes (4:00 PM–5:00 PM TRT), so meetings have to be booked precisely.
TRT 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
TRT
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:
Frequently Asked Questions
What is the time difference between TRT and AST?
TRT (TRT, UTC+03:00) is 7 hours behind AST (AST, UTC-04:00). The gap is currently -7h.
How do I convert TRT time to AST time?
Add -7h to TRT local time. For example, 9:00 AM in TRT 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 TRT.
What is the best time to call AST from TRT?
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, TRT or AST?
TRT is 7 hours behind AST. When it is 12:00 PM in TRT it is 5:00 AM in AST.
Does daylight saving time affect the TRT–AST difference?
Neither zone observes daylight saving time, so the -7h offset between TRT and AST is fixed all year.
Which other cities share TRT's time zone?
TRT also covers Istanbul, Ankara, Izmir, Bursa, Antalya.
Which countries use TRT, TRT's zone?
TRT is used in Turkey.
Is there a day difference between TRT and AST?
Not normally. The -7h gap only pushes the date over the previous day.
What is the time difference between TRT and AST?
AST is -7h from TRT.
What timezone is TRT in?
TRT operates on its local timezone.
What timezone is AST in?
AST operates on its local timezone.
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 TRT, what time is it in AST?
When it is 12:00 AM (midnight) in TRT (TRT), it is -7h later in AST (AST).
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See every conversion from TRT →·See every conversion from AST →