AST to TRT
+7hAST
ASTSOURCETRT
TRTGreen rows indicate typical business hours (9 AM - 5 PM)
AST and TRT on the World Map
The map below highlights the AST (Atlantic Standard Time) and TRT (Turkey Time) timezone regions across the globe.
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.
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 vs TRT: Offsets, DST and Best Call Times
AST runs on Atlantic Standard Time (AST) at UTC-04:00. TRT runs on Turkey Time (TRT) at UTC+03:00. That puts AST 7 hours ahead of TRT — a difference of +7h at the current offsets.
In practice, when it is 9:00 AM in AST it is 4:00 PM in TRT. Midnight in AST is 7:00 AM in TRT. Neither zone observes daylight saving time, so the offset between them stays constant all year.
AST to TRT time conversion table
| AST (AST) | TRT (TRT) | Day |
|---|---|---|
| 12:00 AM | 7:00 AM | same day |
| 6:00 AM | 1:00 PM | same day |
| 7:00 AM | 2:00 PM | same day |
| 8:00 AM | 3:00 PM | same day |
| 9:00 AM | 4:00 PM | same day |
| 12:00 PM | 7:00 PM | same day |
| 3:00 PM | 10:00 PM | same day |
| 5:00 PM | 12:00 AM | next day |
| 6:00 PM | 1:00 AM | next day |
| 9:00 PM | 4:00 AM | next day |
Why people convert AST to TRT time
- Scheduling a call from AST to TRT: a 10:00 AM start in AST lands at 5:00 PM in TRT, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both AST and TRT are inside the 9-to-5 working day between 9:00 AM and 10:00 AM AST time (4:00 PM–5:00 PM TRT). That is roughly 1 hours of usable overlap.
- Keeping family and friends in sync: knowing that 8:00 PM in AST is 3:00 AM in TRT makes it easy to avoid calling at 3 AM.
- Always state the zone abbreviation, not just the hour. "3:00 PM AST" is unambiguous; "3 PM" across a +7h gap is not.
- Block 9:00 AM–10:00 AM AST as the recurring meeting window if you work primarily from AST and need TRT colleagues present.
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.
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 AST and TRT
Both AST and TRT sit inside the 9 AM – 5 PM working day between 9:00 AM–10:00 AM AST, which is 4:00 PM–5:00 PM TRT. That gives roughly 1 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
AST and TRT overlap for only 60 minutes (9:00 AM–10:00 AM AST), so meetings have to be booked precisely.
AST is 7 hours ahead of TRT (AST UTC-04:00 → TRT UTC+03:00). The shared working window is 9:00 AM–10:00 AM AST. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
AST
☀ Currently in DST
Standard: UTC-04:00 · DST: UTC-03:00
Clocks fall back on Sun, Nov 1, 2026
TRT
Does not observe DST
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 AST and TRT?
AST (AST, UTC-04:00) is 7 hours ahead of TRT (TRT, UTC+03:00). The gap is currently +7h.
How do I convert AST time to TRT time?
Add +7h to AST local time. For example, 9:00 AM in AST is 4:00 PM in TRT.
What time is it in TRT right now?
TRT uses TRT at UTC+03:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +7h offset from AST.
What is the best time to call TRT from AST?
Call between 9:00 AM and 10:00 AM AST — that maps to 4:00 PM–5:00 PM TRT and keeps both parties inside the working day.
Which is ahead, AST or TRT?
AST is 7 hours ahead of TRT. When it is 12:00 PM in AST it is 7:00 PM in TRT.
Does daylight saving time affect the AST–TRT difference?
Neither zone observes daylight saving time, so the +7h offset between AST and TRT is fixed all year.
Which other cities share AST's time zone?
AST also covers Halifax, San Juan, Santo Domingo, Caracas, La Paz, Fredericton, Charlottetown.
Which countries use AST, AST's zone?
AST is used in Canada (Atlantic provinces), Puerto Rico, US Virgin Islands, Dominican Republic, Venezuela, Bolivia, Barbados, Trinidad and Tobago.
Is there a day difference between AST and TRT?
Not normally. The +7h gap only pushes the date over for late-evening times.
What is the time difference between AST and TRT?
TRT is +7h from AST.
What timezone is AST in?
AST operates on its local timezone.
What timezone is TRT in?
TRT operates on its local timezone.
Which countries use AST (Atlantic Standard Time)?
AST is used in Canada (Atlantic provinces), Puerto Rico, US Virgin Islands, Dominican Republic, Venezuela, Bolivia, and 2 more countries.
Does AST observe daylight saving time?
Yes, AST switches to ADT during summer months.
What are some interesting facts about AST?
Puerto Rico uses AST year-round and does not observe DST. AST is 1 hour ahead of EST.
Which cities are in the TRT timezone?
Major cities in the TRT timezone include Istanbul, Ankara, Izmir, Bursa, Antalya.
What is the UTC offset for TRT?
Turkey Time (TRT) is at UTC+03:00.
What should I know about the TRT timezone?
Turkey has used a permanent UTC+03:00 since September 2016. TRT is level with Moscow Standard Time and Arabia Standard Time all year.
When is it midnight in AST, what time is it in TRT?
When it is 12:00 AM (midnight) in AST (AST), it is +7h later in TRT (TRT).
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See every conversion from AST →·See every conversion from TRT →