What is the time difference between Tokyo and Chatham Islands?

Chatham Islands is 3 hours 45 minutes ahead of Tokyo. That figure is current — it changes by an hour when either city starts or ends daylight saving, and the exact dates are listed above.

When is the best time to call Chatham Islands from Tokyo?

Between 09:00–14:15 in Tokyo, which is 12:45–18:00 in Chatham Islands. That is the only stretch where both cities are inside a 09:00–18:00 day.

Does Tokyo observe daylight saving time?

No. Tokyo stays on UTC+9 all year, so its clocks never move.

Does Chatham Islands observe daylight saving time?

Yes. Chatham Islands runs on UTC+12:45 in winter and UTC+13:45 in summer. The next change is on 2026-09-27, when clocks go forward by 60 minutes.

If it is midday in Tokyo, what time is it in Chatham Islands?

It is 15:45 in Chatham Islands, on the same calendar date. That holds for the current offsets; it shifts by an hour around the daylight saving dates listed above.

Which time zones do Tokyo and Chatham Islands use?

Tokyo uses Asia/Tokyo, currently UTC+9, and Chatham Islands uses Pacific/Chatham, currently UTC+12:45 (CHAST). Those identifiers are the ones to use in code — abbreviations are ambiguous and offsets change.

Convert Tokyo time to Chatham Islands time

Chatham Islands is 3 hours 45 minutes ahead of Tokyo right now, so midday in Tokyo lands in the afternoon in Chatham Islands.

Convert a time

From

Date

Time

Converted time

—

The converter needs JavaScript to run. Everything below — offsets, daylight saving dates and the hour-by-hour table — is part of the page and works without it.

Hour by hour

The whole day mapped across: read down the left for Tokyo, across for Chatham Islands.

Tokyo	Chatham Islands
00:00	03:45
01:00	04:45
02:00	05:45
03:00	06:45
04:00	07:45
05:00	08:45
06:00	09:45
07:00	10:45
08:00	11:45
09:00	12:45
10:00	13:45
11:00	14:45
12:00	15:45
13:00	16:45
14:00	17:45
15:00	18:45
16:00	19:45
17:00	20:45
18:00	21:45
19:00	22:45
20:00	23:45
21:00	00:45next day
22:00	01:45next day
23:00	02:45next day

Daylight saving time

Chatham Islands changes its clocks; Tokyo does not. The difference between them therefore shifts by an hour twice a year.

Tokyo

Does not observe daylight saving time

Standard: UTC+9

Chatham Islands

Observes daylight saving time

Standard: UTC+12:45
Daylight: UTC+13:45
Next change: 2026-09-27 +60m

When you can actually talk

The window is 5 hours 15 minutes wide — 09:00–14:15 in Tokyo, 12:45–18:00 in Chatham Islands.

Tokyo 09:00–14:15Chatham Islands 12:45–18:00

Reference

The underlying data, in case you need to put it in a calendar invitation or a configuration file.

	Tokyo	Chatham Islands
IANA zone	Asia/Tokyo	Pacific/Chatham
Abbreviation	UTC+9	CHAST
Standard offset	UTC+9	UTC+12:45
Daylight offset	—	UTC+13:45
Clock changes this year	0	2
Country	Japan	New Zealand

Example, not the current time. Live times appear once the page loads.

Common questions

What is the time difference between Tokyo and Chatham Islands?: Chatham Islands is 3 hours 45 minutes ahead of Tokyo. That figure is current — it changes by an hour when either city starts or ends daylight saving, and the exact dates are listed above.
When is the best time to call Chatham Islands from Tokyo?: Between 09:00–14:15 in Tokyo, which is 12:45–18:00 in Chatham Islands. That is the only stretch where both cities are inside a 09:00–18:00 day.
Does Tokyo observe daylight saving time?: No. Tokyo stays on UTC+9 all year, so its clocks never move.
Does Chatham Islands observe daylight saving time?: Yes. Chatham Islands runs on UTC+12:45 in winter and UTC+13:45 in summer. The next change is on 2026-09-27, when clocks go forward by 60 minutes.
If it is midday in Tokyo, what time is it in Chatham Islands?: It is 15:45 in Chatham Islands, on the same calendar date. That holds for the current offsets; it shifts by an hour around the daylight saving dates listed above.
Which time zones do Tokyo and Chatham Islands use?: Tokyo uses Asia/Tokyo, currently UTC+9, and Chatham Islands uses Pacific/Chatham, currently UTC+12:45 (CHAST). Those identifiers are the ones to use in code — abbreviations are ambiguous and offsets change.