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Pacific/Chatham time zone

4:22AMUTC+13:45

UTC+13:45UTC+13:45+18 h 45 min vs New York (you)

About Pacific/Chatham

Pacific/Chatham is the IANA time zone for Chatham Islands in New Zealand. It currently keeps UTC+12:45 in winter and UTC+13:45 in summer.

Its principal location is Chatham at 43.95° S, 176.55° W.

Rule for future years (POSIX TZ string)

<+1245>-12:45<+1345>,M9.5.0/2:45,M4.1.0/3:45

The standard time is called “+1245” (a numeric abbreviation) and is UTC+12:45. POSIX writes the offset with the opposite sign (west of Greenwich is positive), which is why the string says "-12:45". Daylight saving time is called “+1345” (a numeric abbreviation) and is UTC+13:45. It starts on the last Sunday of September at 02:45 and ends on the first Sunday of April at 03:45, local time. Software that has no full tzdata copy, such as many embedded devices, can use this string directly as the TZ environment variable.

Upcoming transitions

Computed from tzdata 2026f; local times are read on the clock just before each change.

History of Pacific/Chatham since 1970

The record starts with local mean time (UTC+12:14), which ended on November 2, 1868. The first daylight saving time in the record is in 1974.

YearsClocksAbbreviations
1970–1973UTC+12:45 all year—
1974UTC+12:45 until November 3, then UTC+13:45—
1975 onwardUTC+12:45 in winter, UTC+13:45 in summer—

Before 1970

2 offset changes before 1970 in the record:

tzdata commits to accuracy from 1970 for every zone (zone1970.tab); earlier entries are historical research and may be incomplete.

Aliases and zones with the same clock

These older or country-specific IDs are links to Pacific/Chatham in tzdata. Their pages redirect here: NZ-CHAT.

Convert Chatham time

Tip: Alt+↑/↓ steps the time by 15 minutes (Shift: one hour). The link keeps the date, time and direction.

Using Pacific/Chatham in code

Every major platform reads the same IANA ID. Store instants in UTC and convert with the ID at display time; never store a fixed offset for a place that has daylight saving time.

// JavaScript
new Date().toLocaleString('en-US', { timeZone: 'Pacific/Chatham' })

# Python 3.9+
from zoneinfo import ZoneInfo
from datetime import datetime
datetime.now(ZoneInfo('Pacific/Chatham'))

// Java
java.time.ZonedDateTime.now(java.time.ZoneId.of("Pacific/Chatham"))

// Go
loc, _ := time.LoadLocation("Pacific/Chatham")
time.Now().In(loc)

-- PostgreSQL
SELECT now() AT TIME ZONE 'Pacific/Chatham';

# Shell
TZ='Pacific/Chatham' date

Platforms ship their own copy of tzdata and update it on their own schedule. After a rule change, outputs can differ until the platform updates; this page uses tzdata 2026f.

Questions

What is the UTC offset of Pacific/Chatham?
UTC+12:45 in winter and UTC+13:45 in summer (daylight saving time from the last Sunday of September at 2:45 AM to the first Sunday of April at 3:45 AM).
Does Pacific/Chatham observe daylight saving time?
Yes: clocks move one hour forward on the last Sunday of September at 2:45 AM and back on the first Sunday of April at 3:45 AM.
Is NZ-CHAT the same as Pacific/Chatham?
Yes. NZ-CHAT is a link (alias) to Pacific/Chatham in tzdata and gives the same time since 1970. It remains a valid ID.
Which countries use Pacific/Chatham?
New Zealand, according to zone1970.tab in tzdata.

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