Honolulu to AST
+6hHonolulu
HSTSOURCEAST
ASTGreen rows indicate typical business hours (9 AM - 5 PM)
HST and AST on the World Map
The map below highlights the HST (Hawaii Standard Time) and AST (Atlantic Standard Time) timezone regions across the globe.
HST – Hawaii Standard Time
UTC-10:00Hawaii Standard Time (HST) is the time zone for the Hawaiian Islands, 10 hours behind UTC.
- •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).
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.
About Honolulu
WikipediaHonolulu 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.
Pearl Harbor memorial receives over 2 million visitors annually.
Understanding the +6h Gap: Honolulu vs AST
Honolulu runs on Hawaii-Aleutian Standard Time (HST) at UTC-10:00. AST runs on Atlantic Standard Time (AST) at UTC-04:00. That puts Honolulu 6 hours ahead of AST — a difference of +6h at the current offsets.
In practice, when it is 9:00 AM in Honolulu it is 3:00 PM in AST. Midnight in Honolulu is 6:00 AM in AST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
Honolulu to AST time conversion table
| Honolulu (HST) | AST (AST) | Day |
|---|---|---|
| 12:00 AM | 6:00 AM | same day |
| 6:00 AM | 12:00 PM | same day |
| 7:00 AM | 1:00 PM | same day |
| 8:00 AM | 2:00 PM | same day |
| 9:00 AM | 3:00 PM | same day |
| 12:00 PM | 6:00 PM | same day |
| 3:00 PM | 9:00 PM | same day |
| 5:00 PM | 11:00 PM | same day |
| 6:00 PM | 12:00 AM | next day |
| 9:00 PM | 3:00 AM | next day |
Why people convert Honolulu to AST time
- Scheduling a call from Honolulu to AST: a 10:00 AM start in Honolulu lands at 4:00 PM in AST, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both Honolulu and AST are inside the 9-to-5 working day between 9:00 AM and 11:00 AM HST time (3:00 PM–5:00 PM AST). That is roughly 2 hours of usable overlap.
- Coordinating a Honolulu-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 HST" is unambiguous; "3 PM" across a +6h gap is not.
- Block 9:00 AM–11:00 AM HST as the recurring meeting window if you work primarily from Honolulu and need AST colleagues present.
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.
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 Honolulu and AST
Both Honolulu and AST sit inside the 9 AM – 5 PM working day between 9:00 AM–11:00 AM HST, which is 3:00 PM–5:00 PM AST. That gives roughly 2 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
Honolulu and AST overlap for about 2 hours during the working day — enough for meetings if you avoid the edges of the window.
Honolulu is 6 hours ahead of AST (HST UTC-10:00 → AST UTC-04:00). The shared working window is 9:00 AM–11:00 AM HST. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
Honolulu
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 Honolulu and AST?
Honolulu (HST, UTC-10:00) is 6 hours ahead of AST (AST, UTC-04:00). The gap is currently +6h.
How do I convert Honolulu time to AST time?
Add +6h to Honolulu local time. For example, 9:00 AM in Honolulu is 3:00 PM 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 +6h offset from Honolulu.
What is the best time to call AST from Honolulu?
Call between 9:00 AM and 11:00 AM HST — that maps to 3:00 PM–5:00 PM AST and keeps both parties inside the working day.
Which is ahead, Honolulu or AST?
Honolulu is 6 hours ahead of AST. When it is 12:00 PM in Honolulu it is 6:00 PM in AST.
Do Honolulu and AST use different time zones?
Honolulu (USA) uses HST at UTC-10:00, while AST uses AST at UTC-04:00. The IANA identifiers are Pacific/Honolulu and America/Halifax.
Does daylight saving time affect the Honolulu–AST difference?
Neither zone observes daylight saving time, so the +6h offset between Honolulu and AST is fixed all year.
Which other cities share Honolulu's time zone?
HST also covers Honolulu, Hilo, Kailua, Pearl City, Kapolei.
Which countries use HST, Honolulu's zone?
HST is used in United States (Hawaii).
Is there a day difference between Honolulu and AST?
Not normally. The +6h gap only pushes the date over for late-evening times.
What is the time difference between Honolulu and AST?
AST is +6h from Honolulu.
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 timezone is AST in?
AST operates on its local timezone.
What are the business hours in Honolulu?
Standard business hours in Honolulu are 8:00 AM - 5:00 PM HST.
Which countries use HST (Hawaii Standard Time)?
HST is used in United States (Hawaii).
Does HST observe daylight saving time?
No, HST does not observe daylight saving time and remains at UTC-10:00 year-round.
What are some interesting 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.
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 Honolulu, what time is it in AST?
When it is 12:00 AM (midnight) in Honolulu (HST), it is +6h later in AST (AST).
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