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AST to Honolulu

-6h

AST

ASTSOURCE
UTC-03:00☀ DST active
HH12
:
MM00
  
12:00 (24-hr)
12 AM6 AM12 PM6 PM12 AM

Honolulu

HST
USA · UTC-10:00
HH06
:
MM00
  
06:00 (24-hr)
12 AM6 AM12 PM6 PM12 AM
AST
Honolulu
12:00 AM
5:00 PM-1
2:00 AM
7:00 PM-1
4:00 AM
9:00 PM-1
6:00 AM
11:00 PM-1
8:00 AM
1:00 AM
10:00 AM
3:00 AM
12:00 PM
5:00 AM
2:00 PM
7:00 AM
4:00 PM
9:00 AM
6:00 PM
11:00 AM
8:00 PM
1:00 PM
10:00 PM
3:00 PM

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

AST and HST on the World Map

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

ASTHSTHalifaxSan JuanSanto DomingoCaracasHonoluluHiloKailuaPearl City
AST Zone
→
HST Zone

Explore all world timezones interactively →

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

HST – Hawaii Standard Time

UTC-10:00

Hawaii Standard Time (HST) is the time zone for the Hawaiian Islands, 10 hours behind UTC.

Countries in HST
United States (Hawaii)
Major Cities in HST
HonoluluHiloKailuaPearl CityKapolei
Key Facts about HST
  • •Hawaii does not observe daylight saving time.
  • •HST is 5 hours behind EST in winter and 6 hours behind EDT in summer.
  • •Hawaii is one of only two US states that don't observe DST (the other is Arizona).
Daylight Saving:No – UTC-10:00 year-round
Learn more about HST on Wikipedia

About Honolulu

Wikipedia

Honolulu operates on Hawaii Standard Time (HST), UTC-10 with no daylight saving. Hawaii's consistent time makes it a predictable connection between Asia and mainland USA.

Population:350,000
Metro:1 million
Business Hours:8:00 AM - 5:00 PM HST
Currency:USD ($)
Key Landmarks
Waikiki BeachDiamond HeadPearl HarborIolani PalaceHanauma Bay
Did You Know?

Pearl Harbor memorial receives over 2 million visitors annually.

Learn more about HST timezone →

Time Conversion Guide: AST to Honolulu

AST runs on Atlantic Standard Time (AST) at UTC-04:00. Honolulu runs on Hawaii-Aleutian Standard Time (HST) at UTC-10:00. That puts AST 6 hours behind Honolulu — a difference of -6h at the current offsets.

In practice, when it is 9:00 AM in AST it is 3:00 AM in Honolulu. Midnight in AST is 6:00 PM in Honolulu. Neither zone observes daylight saving time, so the offset between them stays constant all year.

AST to Honolulu time conversion table

AST (AST)Honolulu (HST)Day
12:00 AM6:00 PMprevious day
6:00 AM12:00 AMsame day
7:00 AM1:00 AMsame day
8:00 AM2:00 AMsame day
9:00 AM3:00 AMsame day
12:00 PM6:00 AMsame day
3:00 PM9:00 AMsame day
5:00 PM11:00 AMsame day
6:00 PM12:00 PMsame day
9:00 PM3:00 PMsame day

Why people convert AST to Honolulu time

  • Scheduling a call from AST to Honolulu: a 10:00 AM start in AST lands at 4:00 AM in Honolulu, so you can confirm the slot without doing the arithmetic yourself.
  • Finding shared working hours: both AST and Honolulu are inside the 9-to-5 working day between 3:00 PM and 5:00 PM AST time (9:00 AM–11:00 AM HST). That is roughly 2 hours of usable overlap.
  • Keeping family and friends in sync: knowing that 8:00 PM in AST is 2:00 PM in Honolulu 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 -6h gap is not.
  • Block 3:00 PM–5:00 PM AST as the recurring meeting window if you work primarily from AST and need Honolulu 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 HST (Hawaii Standard Time)

Hawaii Standard Time (HST) is used in the state of Hawaii and does not observe daylight saving time. This makes HST one of the most consistent time zones in the US. The Hawaiian Islands are among the last places on Earth to see a new calendar day.

Best time to call between AST and Honolulu

Both AST and Honolulu sit inside the 9 AM – 5 PM working day between 3:00 PM–5:00 PM AST, which is 9:00 AM–11:00 AM HST. That gives roughly 2 hours of shared time — the safest window for a live call or meeting.

Business hours overlap

AST and Honolulu overlap for about 2 hours during the working day — enough for meetings if you avoid the edges of the window.

AST is 6 hours behind Honolulu (AST UTC-04:00 → HST UTC-10:00). The shared working window is 3:00 PM–5:00 PM 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

Honolulu

Does not observe DST

Frequently Asked Questions

What is the time difference between AST and Honolulu?

AST (AST, UTC-04:00) is 6 hours behind Honolulu (HST, UTC-10:00). The gap is currently -6h.

How do I convert AST time to Honolulu time?

Add -6h to AST local time. For example, 9:00 AM in AST is 3:00 AM in Honolulu.

What time is it in Honolulu right now?

Honolulu uses HST at UTC-10:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -6h offset from AST.

What is the best time to call Honolulu from AST?

Call between 3:00 PM and 5:00 PM AST — that maps to 9:00 AM–11:00 AM HST and keeps both parties inside the working day.

Which is behind, AST or Honolulu?

AST is 6 hours behind Honolulu. When it is 12:00 PM in AST it is 6:00 AM in Honolulu.

Do AST and Honolulu use different time zones?

AST uses AST at UTC-04:00, while Honolulu (USA) uses HST at UTC-10:00. The IANA identifiers are America/Halifax and Pacific/Honolulu.

Does daylight saving time affect the AST–Honolulu difference?

Neither zone observes daylight saving time, so the -6h offset between AST and Honolulu 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 Honolulu?

Not normally. The -6h gap only pushes the date over the previous day.

What is the time difference between AST and Honolulu?

Honolulu is -6h from AST.

What timezone is AST in?

AST operates on its local timezone.

What timezone is Honolulu in?

Honolulu operates on Hawaii Standard Time (HST), UTC-10 with no daylight saving. Hawaii's consistent time makes it a predictable connection between Asia and mainland USA.

What are the business hours in Honolulu?

Standard business hours in Honolulu are 8:00 AM - 5:00 PM HST.

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 HST timezone?

Major cities in the HST timezone include Honolulu, Hilo, Kailua, Pearl City, Kapolei.

What is the UTC offset for HST?

Hawaii Standard Time (HST) is at UTC-10:00.

What should I know about the HST timezone?

Hawaii does not observe daylight saving time. HST is 5 hours behind EST in winter and 6 hours behind EDT in summer.

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

When it is 12:00 AM (midnight) in AST (AST), it is -6h later in Honolulu (HST).