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America/Havana time zone

8:57AMCDT

CDTUTC−4+1 h vs New York (you)

About America/Havana

America/Havana is the IANA time zone for Cuba. It currently keeps Cuba Standard Time (CST, UTC−5) in winter and Cuba Daylight Time (CDT, UTC−4) in summer.

Its principal location is Havana at 23.13° N, 82.37° W.

Abbreviations in use: CST, CDT. Offset page: UTC−5.

Rule for future years (POSIX TZ string)

CST5CDT,M3.2.0/0,M11.1.0/1

The standard time is called CST and is UTC−5. POSIX writes the offset with the opposite sign (west of Greenwich is positive), which is why the string says "5". Daylight saving time is called CDT and is UTC−4. It starts on the second Sunday of March at 00:00 and ends on the first Sunday of November at 01:00, 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/Havana since 1970

The record starts with local mean time (UTC−5:29), which ended on January 1, 1890. The first daylight saving time in the record is in 1928.

YearsClocksAbbreviations
1970–2003UTC−5 in winter, UTC−4 in summerCST, CDT
2004UTC−5 until March 28, then UTC−4CST, CDT
2005UTC−4 all yearCDT
2006UTC−4 until October 29, then UTC−5CDT, CST
2007–2025UTC−5 in winter, UTC−4 in summerCST, CDT
2026UTC−5 until March 8, then UTC−4CST, CDT
2027UTC−4 until November 7, then UTC−5CDT, CST
2028 onwardUTC−5 in winter, UTC−4 in summerCST, CDT

Before 1970

24 offset changes before 1970 in the record:

Changes of the winter (standard) offset: Sunday, March 28, 2004, UTC−5 → UTC−4; Sunday, October 29, 2006, UTC−4 → UTC−5.

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/Havana in tzdata. Their pages redirect here: Cuba.

Places on America/Havana

Convert Havana time

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

Using America/Havana 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/Havana' })

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

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

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

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

# Shell
TZ='America/Havana' 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/Havana?
UTC−5 in winter and UTC−4 in summer (daylight saving time from the second Sunday of March at 12:00 AM to the first Sunday of November at 1:00 AM).
Does America/Havana observe daylight saving time?
Yes: clocks move one hour forward on the second Sunday of March at 12:00 AM and back on the first Sunday of November at 1:00 AM.
Is Cuba the same as America/Havana?
Yes. Cuba is a link (alias) to America/Havana in tzdata and gives the same time since 1970. It remains a valid ID.
Which countries use America/Havana?
Cuba, according to zone1970.tab in tzdata.

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