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America/St_Johns time zone

10:31AMNST

NSTUTC−3:30+1 h 30 min vs New York (you)

About America/St_Johns

America/St_Johns is the IANA time zone for Newfoundland, Labrador (SE) in Canada. It currently keeps Newfoundland Standard Time (NST, UTC−3:30) in winter and Newfoundland Daylight Time (NDT, UTC−2:30) in summer.

Its principal location is St Johns at 47.57° N, 52.72° W.

Abbreviations in use: NST, NDT. Offset page: UTC−3:30.

Rule for future years (POSIX TZ string)

NST3:30NDT,M3.2.0,M11.1.0

The standard time is called NST and is UTC−3:30. POSIX writes the offset with the opposite sign (west of Greenwich is positive), which is why the string says "3:30". Daylight saving time is called NDT and is UTC−2:30. It starts on the second Sunday of March at 02:00 and ends on the first Sunday of November at 02:00, 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 America/St_Johns since 1970

The record starts with local mean time (UTC−3:31), which ended on December 31, 1883. The first daylight saving time in the record is in 1917.

YearsClocksAbbreviations
1970–1987UTC−3:30 in winter, UTC−2:30 in summerNST, NDT
1988UTC−3:30 in winter, UTC−1:30 in summerNST, NDDT
1989 onwardUTC−3:30 in winter, UTC−2:30 in summerNST, NDT

Before 1970

101 offset changes before 1970 in the record; the first 12 and the last 12:

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 America/St_Johns in tzdata. Their pages redirect here: Canada/Newfoundland.

Convert St Johns time

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

Using America/St_Johns 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: 'America/St_Johns' })

# Python 3.9+
from zoneinfo import ZoneInfo
from datetime import datetime
datetime.now(ZoneInfo('America/St_Johns'))

// Java
java.time.ZonedDateTime.now(java.time.ZoneId.of("America/St_Johns"))

// Go
loc, _ := time.LoadLocation("America/St_Johns")
time.Now().In(loc)

-- PostgreSQL
SELECT now() AT TIME ZONE 'America/St_Johns';

# Shell
TZ='America/St_Johns' 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 America/St_Johns?
UTC−3:30 in winter and UTC−2:30 in summer (daylight saving time from the second Sunday of March at 2:00 AM to the first Sunday of November at 2:00 AM).
Does America/St_Johns observe daylight saving time?
Yes: clocks move one hour forward on the second Sunday of March at 2:00 AM and back on the first Sunday of November at 2:00 AM.
Is Canada/Newfoundland the same as America/St_Johns?
Yes. Canada/Newfoundland is a link (alias) to America/St_Johns in tzdata and gives the same time since 1970. It remains a valid ID.
Which countries use America/St_Johns?
Canada, according to zone1970.tab in tzdata.

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