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America/Cambridge_Bay time zone

6:10AMMST

MSTUTC−7−2 h vs New York (you)

About America/Cambridge_Bay

America/Cambridge_Bay is the IANA time zone for Mountain: NU (west) in Canada. It currently keeps Mountain Standard Time (MST, UTC−7) in winter and Mountain Daylight Time (MDT, UTC−6) in summer.

Its principal location is Cambridge Bay at 69.11° N, 105.05° W.

Abbreviations in use: MST, MDT. Offset page: UTC−7.

Rule for future years (POSIX TZ string)

MST7MDT,M3.2.0,M11.1.0

The standard time is called MST and is UTC−7. POSIX writes the offset with the opposite sign (west of Greenwich is positive), which is why the string says "7". Daylight saving time is called MDT and is UTC−6. 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/Cambridge_Bay since 1970

YearsClocksAbbreviations
1970–1971UTC−7 all yearMST
1972–1998UTC−7 in winter, UTC−6 in summerMST, MDT
1999UTC−7 until April 4, then UTC−6MST, MDT, CST
2000UTC−6 in winter, UTC−5 in summerCST, CDT, EST
2001UTC−6 until October 28, then UTC−7CST, MDT, MST
2002 onwardUTC−7 in winter, UTC−6 in summerMST, MDT

Before 1970

3 offset changes before 1970 in the record:

Changes of the winter (standard) offset: Sunday, April 4, 1999, UTC−7 → UTC−6; Sunday, October 28, 2001, UTC−6 → UTC−7.

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

Other zones that keep exactly the same time under the current rules (but have a different history): America/Boise, America/Ciudad_Juarez, America/Denver.

Convert Cambridge Bay time

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

Using America/Cambridge_Bay 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/Cambridge_Bay' })

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

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

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

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

# Shell
TZ='America/Cambridge_Bay' 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/Cambridge_Bay?
UTC−7 in winter and UTC−6 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/Cambridge_Bay 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.
Which countries use America/Cambridge_Bay?
Canada, according to zone1970.tab in tzdata.

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