What is NZST in AST?

Atlantic Time is 15 hours behind

New Zealand Time is on UTC+12:00 and Atlantic Time is on UTC−3:00 right now. Atlantic Time is on daylight saving, so its clocks read ADT. The gap changes during the year — see below.

Time in Auckland: 12:53:44 AM
Time in Halifax: 9:53:44 AM
Difference: −15 h
Next clock change: September 27, 2026

Convert a time

NZST — New Zealand Time

ADT — Atlantic Time

9:00 am

ADT, Fri, the previous day

When the difference changes

New Zealand Time and Atlantic Time do not change their clocks on the same dates, so the gap between them is not the same all year. Most converters show only today’s figure. These are the periods ahead:

Now – September 27, 2026Atlantic Time is 15 hours behind
September 27, 2026 – November 1, 2026Atlantic Time is 16 hours behind
November 1, 2026 – March 14, 2027Atlantic Time is 17 hours behind
March 14, 2027 – April 4, 2027Atlantic Time is 16 hours behind
April 4, 2027 – September 26, 2027Atlantic Time is 15 hours behind
September 26, 2027 – onwardsAtlantic Time is 16 hours behind

Periods shorter than a day are not listed. Each zone changes at its own local time, so on a date when both move there are a few hours when the gap is briefly something else.

Daylight saving

New Zealand Time

Sunday, September 27, 2026

Clocks go forward one hour — 2:00 am becomes 3:00 am local time, and the zone is on NZDT after that.

Atlantic Time

Sunday, November 1, 2026

Clocks go back one hour — 2:00 am becomes 1:00 am local time, and the zone is on AST after that.

NZST to AST conversion table

Every hour of Saturday, September 26, 2026, converted from New Zealand Time to Atlantic Time. 15 of the 24 hours fall on a different calendar day in Halifax, which is marked.

12:00 am NZST: 9:00 am ADT−1 day
1:00 am NZST: 10:00 am ADT−1 day
2:00 am NZST: 11:00 am ADT−1 day
3:00 am NZST: 12:00 pm ADT−1 day
4:00 am NZST: 1:00 pm ADT−1 day
5:00 am NZST: 2:00 pm ADT−1 day
6:00 am NZST: 3:00 pm ADT−1 day
7:00 am NZST: 4:00 pm ADT−1 day
8:00 am NZST: 5:00 pm ADT−1 day
9:00 am NZST: 6:00 pm ADT−1 day
10:00 am NZST: 7:00 pm ADT−1 day
11:00 am NZST: 8:00 pm ADT−1 day

12:00 pm NZST: 9:00 pm ADT−1 day
1:00 pm NZST: 10:00 pm ADT−1 day
2:00 pm NZST: 11:00 pm ADT−1 day
3:00 pm NZST: 12:00 am ADT
4:00 pm NZST: 1:00 am ADT
5:00 pm NZST: 2:00 am ADT
6:00 pm NZST: 3:00 am ADT
7:00 pm NZST: 4:00 am ADT
8:00 pm NZST: 5:00 am ADT
9:00 pm NZST: 6:00 am ADT
10:00 pm NZST: 7:00 am ADT
11:00 pm NZST: 8:00 am ADT

Scheduling between the two

There is no overlap between a nine-to-six working day in Auckland and one in Halifax — the gap is too wide. A call has to sit early or late for one side. Early morning in Auckland is the usual compromise, since that is late afternoon or evening in Halifax.

A note on AST: it can also mean Arabia Standard Time (UTC+3). This page means Atlantic Time.

Atlantic Time (ADT) is used in Nova Scotia, New Brunswick and Puerto Rico