AST to NZDT
+17hAST
ASTSOURCENZDT
NZDTGreen rows indicate typical business hours (9 AM - 5 PM)
AST and NZDT on the World Map
The map below highlights the AST (Atlantic Standard Time) and NZDT (New Zealand Daylight 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.
NZDT – New Zealand Daylight Time
UTC+13:00New Zealand Daylight Time (NZDT, UTC+13:00) is New Zealand's summer time zone, one of the earliest offsets in the world.
- •NZDT runs from the last Sunday in September to the first Sunday in April.
- •NZDT is UTC+13:00 — one of the earliest time offsets used anywhere.
- •New Zealand changes its clocks two to three weeks before Australia.
- •The Chatham Islands observe UTC+13:45 during their summer time.
Understanding the +17h Gap: AST vs NZDT
AST runs on Atlantic Standard Time (AST) at UTC-04:00. NZDT runs on New Zealand Daylight Time (NZDT) at UTC+13:00. That puts AST 17 hours ahead of NZDT — a difference of +17h at the current offsets.
In practice, when it is 9:00 AM in AST it is 2:00 AM in NZDT on the next day. Midnight in AST is 5:00 PM in NZDT. Neither zone observes daylight saving time, so the offset between them stays constant all year.
AST to NZDT time conversion table
| AST (AST) | NZDT (NZDT) | Day |
|---|---|---|
| 12:00 AM | 5:00 PM | same day |
| 6:00 AM | 11:00 PM | same day |
| 7:00 AM | 12:00 AM | next day |
| 8:00 AM | 1:00 AM | next day |
| 9:00 AM | 2:00 AM | next day |
| 12:00 PM | 5:00 AM | next day |
| 3:00 PM | 8:00 AM | next day |
| 5:00 PM | 10:00 AM | next day |
| 6:00 PM | 11:00 AM | next day |
| 9:00 PM | 2:00 PM | next day |
Why people convert AST to NZDT time
- Scheduling a call from AST to NZDT: a 10:00 AM start in AST lands at 3:00 AM in NZDT the next day, so you can confirm the slot without doing the arithmetic yourself.
- Handling a +17h gap: AST and NZDT have no overlap inside a normal 9-to-5 day, so real-time meetings need an early-morning or late-evening slot on one side. 9:00 AM in NZDT is 2:00 AM in AST.
- Coordinating a AST-based team with NZDT 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 AST" is unambiguous; "3 PM" across a +17h gap is not.
- With a +17h gap there is no shared 9-to-5 window, so alternate the early start: one week AST takes the early slot, the next week NZDT does.
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 NZDT (New Zealand Daylight Time)
New Zealand Daylight Time (NZDT) is the summer time zone for New Zealand, one hour ahead of New Zealand Standard Time (NZST, UTC+12:00). It runs from the last Sunday in September to the first Sunday in April, so New Zealand shifts a week or two earlier in spring than Australia. At UTC+13:00, NZDT is among the earliest offsets in the world — only Samoa, Tonga and parts of Kiribati run further ahead at certain times of year. Auckland and Wellington are 13 hours ahead of UTC during NZDT, 12 hours ahead of Sydney, and 18 hours ahead of New York. The Chatham Islands, 45 minutes further east, move to UTC+13:45.
Best time to call between AST and NZDT
With a +17h offset there is no overlap inside a normal 9 AM – 5 PM day. NZDT opens at 9:00 AM NZDT, which is 2:00 AM in AST, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
AST and NZDT have no shared working hours because of the +17h gap. Teams need to alternate early starts or rely on asynchronous handovers.
AST is 17 hours ahead of NZDT (AST UTC-04:00 → NZDT UTC+13:00). There is no shared 9-to-5 window, so plan around an early or late slot. 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
NZDT
☀ Currently in DST
Standard: UTC+12:00 · DST: UTC+13:00
Clocks fall back on Sat, Apr 3, 2027
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 NZDT?
AST (AST, UTC-04:00) is 17 hours ahead of NZDT (NZDT, UTC+13:00). The gap is currently +17h.
How do I convert AST time to NZDT time?
Add +17h to AST local time. For example, 9:00 AM in AST is 2:00 AM in NZDT (next day).
What time is it in NZDT right now?
NZDT uses NZDT at UTC+13:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +17h offset from AST.
What is the best time to call NZDT from AST?
There is no shared working-hours window because of the +17h gap. The closest option is 1:00 PM in AST, which is 6:00 AM in NZDT.
Which is ahead, AST or NZDT?
AST is 17 hours ahead of NZDT. When it is 12:00 PM in AST it is 5:00 AM in NZDT.
Does daylight saving time affect the AST–NZDT difference?
Neither zone observes daylight saving time, so the +17h offset between AST and NZDT 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 NZDT?
Sometimes. The +17h gap is large enough that 8:00 PM or later in AST already falls on the next day in NZDT.
What is the time difference between AST and NZDT?
NZDT is +17h from AST.
What timezone is AST in?
AST operates on its local timezone.
What timezone is NZDT in?
NZDT 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 NZDT timezone?
Major cities in the NZDT timezone include Auckland, Wellington, Christchurch, Hamilton, Dunedin.
What is the UTC offset for NZDT?
New Zealand Daylight Time (NZDT) is at UTC+13:00. During daylight saving time, it shifts to NZDT.
What should I know about the NZDT timezone?
NZDT runs from the last Sunday in September to the first Sunday in April. NZDT is UTC+13:00 — one of the earliest time offsets used anywhere.
When is it midnight in AST, what time is it in NZDT?
When it is 12:00 AM (midnight) in AST (AST), it is +17h later in NZDT (NZDT).
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See every conversion from AST →·See every conversion from NZDT →