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Puerto Rico • Live Time Zone Guide

Puerto Rico Time Zone

Puerto Rico uses Atlantic Standard Time (AST), UTC−04:00, all year. The territory does not observe daylight saving time, so San Juan and every other Puerto Rico municipality keep the same UTC offset through the seasons.

Puerto Rico is not on U.S. Eastern Time. AST is fixed at UTC−04:00. U.S. Eastern Time can have the same numeric offset when it is at UTC−04:00, but Eastern Standard Time is UTC−05:00. That distinction is why Puerto Rico can match New York for part of the year and be one hour ahead at other times under seasonal Eastern rules.
Time zoneASTAtlantic Standard Time
UTC offsetUTC−04:00Year-round under current rules
Daylight savingNot observedNo seasonal clock change
See Puerto Rico Time Zone Details Time Zone Converter Caribbean Time Zone Map
Search Puerto Rico time-zone facts or open the related AST, current-time, UTC-offset and Caribbean map references.
Popular: Time in Puerto Rico Time in San Juan AST Time Now Atlantic Time Zone UTC Offsets Caribbean Time Zone Map

Puerto Rico Time Zone at a Glance

Puerto Rico's civil-time system is unusually simple: one territorywide zone, one fixed UTC offset and no seasonal clock change. The confusing part is how AST relates to U.S. Eastern Time.

AST

Atlantic Standard Time

See the territorywide AST rule, UTC−04:00 offset and IANA identifier.

View the zone → ET

Puerto Rico vs Eastern Time

Understand why AST can match EDT but is never the same thing as Eastern Time.

Compare the labels → DST

No Daylight Saving Time

Puerto Rico keeps UTC−04:00 through the year and does not change clocks seasonally.

See the DST rule → PR

Same Time Across Puerto Rico

San Juan, Ponce, Mayagüez, Vieques and the rest of Puerto Rico share the same civil time.

Browse locations → IANA

America/Puerto_Rico

Use the location-specific IANA identifier for software, calendars and date-aware calculations.

See IANA details → ⇄

Compare Puerto Rico

Compare Puerto Rico live with New York, Miami, Jamaica, London and other locations.

Compare live times →

Puerto Rico Uses One Time Zone

Puerto Rico uses Atlantic Standard Time across the entire territory. The same AST / UTC−04:00 clock applies in San Juan, Ponce, Mayagüez, Bayamón, Carolina, Caguas, Vieques, Culebra and every other municipality.

Browse Caribbean time zones →
Time ZoneCoverageIANA IdentifierLive TimeCurrent OffsetDST
Atlantic Standard Time
AST		All of Puerto RicoAmerica/Puerto_RicoLive—No seasonal change
AST Time Now Atlantic Time Zone Current Time in Puerto Rico

Puerto Rico Time Zone by Key Location

There are no municipal time-zone boundaries inside Puerto Rico. These locations all use the same AST clock, so travel within the territory never requires a time-zone change.

CapitalSan JuanAST · UTC−04:00 · no DST.→ South CoastPonceSame time as San Juan.→ West CoastMayagüezSame AST / UTC−04:00 clock.→ Metro AreaCarolinaNo time difference from San Juan.→ Metro AreaBayamónAST year-round.→ Central-EastCaguasUTC−04:00 year-round.→ Territory ClockCurrent Time in Puerto RicoLive territorywide clock and date.→ Visual GeographyCaribbean Time Zone MapSee Puerto Rico in its regional context.→

Do Different Parts of Puerto Rico Have Different Time Zones?

No. Puerto Rico has one civil time across the main island and its inhabited island municipalities. The table below makes that territorywide rule explicit.

See the live Puerto Rico clock →
LocationTime ZoneIANA ZoneCurrent TimeCurrent UTC OffsetClock Change?
San JuanASTAmerica/Puerto_RicoLive—No
PonceASTAmerica/Puerto_RicoLive—No
MayagüezASTAmerica/Puerto_RicoLive—No
BayamónASTAmerica/Puerto_RicoLive—No
CarolinaASTAmerica/Puerto_RicoLive—No
CaguasASTAmerica/Puerto_RicoLive—No
AreciboASTAmerica/Puerto_RicoLive—No
ViequesASTAmerica/Puerto_RicoLive—No
CulebraASTAmerica/Puerto_RicoLive—No
AST ≠ Eastern Time

Puerto Rico vs U.S. Eastern Time

Puerto Rico stays on AST at UTC−04:00. Eastern Standard Time is UTC−05:00, while Eastern Daylight Time is UTC−04:00. That means Puerto Rico can share the same clock reading as an Eastern U.S. city when that city is at UTC−04:00, yet the labels and seasonal rules remain different. When an Eastern city is at UTC−05:00, Puerto Rico is one hour ahead.

AST Time Now Atlantic Time Zone UTC Offsets Time Zone Converter
Puerto RicoLive timeAST · loading offset
New YorkLive timeEastern Time · loading offset
MiamiLive timeEastern Time · loading offset
U.S. Virgin IslandsLive timeAST · loading offset

AST, EST and EDT Are Not the Same Thing

These abbreviations are easy to confuse because two of them can share the same UTC offset at certain times. The fixed meaning of each abbreviation matters.

Time Zone Abbreviations →
Puerto Rico

AST · UTC−04:00

Atlantic Standard Time is Puerto Rico's year-round civil time. Puerto Rico does not switch to Atlantic Daylight Time.

Eastern Standard

EST · UTC−05:00

EST is one hour behind Puerto Rico. Calling Puerto Rico “EST” is incorrect even if a search result loosely groups it with East Coast time.

Eastern Daylight

EDT · UTC−04:00

EDT has the same numeric UTC offset as Puerto Rico's AST, but it is a daylight-time label with different seasonal semantics.

Atlantic Time

AT Can Be Seasonal

Some Atlantic Time locations alternate between AST and ADT. Puerto Rico does not; it remains on AST all year.

UTC Offset

Offset Is Not the Whole Zone

UTC−04:00 describes a numeric difference from UTC. A time zone also carries location-specific rules and history.

Software

Use America/Puerto_Rico

For calendars and code, the IANA location is safer than assuming an abbreviation contains all of Puerto Rico's rule history.

Does Puerto Rico Observe Daylight Saving Time?

No. Puerto Rico does not observe daylight saving time. NIST lists Puerto Rico among the U.S. regions that do not observe DST, and Time.gov identifies Puerto Rico and the U.S. Virgin Islands as Atlantic Standard Time (AST), UTC−4.

No spring clock changePuerto Rico does not move clocks forward for daylight saving time.
No fall clock changePuerto Rico does not move clocks back to a second seasonal offset.
UTC−04:00 all yearThe territory keeps the same current offset under present rules.
New York comparison can changeThe difference depends on the current Eastern U.S. offset, not on any clock change in Puerto Rico.

Puerto Rico Is a U.S. Territory — Why No DST?

U.S. daylight-saving observance is not uniform across every state and territory. Puerto Rico is specifically among the U.S. regions that do not observe daylight saving time. Being a U.S. territory does not put Puerto Rico on Eastern Time or require it to follow mainland seasonal clock changes.

Puerto RicoAST · UTC−04:00 · no DST.
U.S. Virgin IslandsAST · UTC−04:00 · no DST, sharing Puerto Rico's clock under current rules.
U.S. Eastern locationsUse their own date-aware Eastern rules; do not infer their offset from Puerto Rico.
Best practiceUse IANA zones for both locations when comparing a future or historical date.

Quick Puerto Rico Time Zone Compare

Compare Puerto Rico with a major location right now. The tool reads the current IANA offset for each location instead of relying on a fixed difference.

Live time
Current abbreviation and UTC offset
⇄
Live time
Current abbreviation and UTC offset
Open Full Converter

How Puerto Rico's Time Zone Works

Six facts resolve nearly every Puerto Rico time-zone question.

01 · Territorywide

One Civil Time

All of Puerto Rico uses the same time zone. There are no east-west municipal time-zone boundaries.

02 · Abbreviation

AST Is the Correct Label

Puerto Rico uses Atlantic Standard Time, commonly abbreviated AST.

03 · Offset

UTC−04:00 Year-Round

Puerto Rico remains four hours behind Coordinated Universal Time under current rules.

04 · DST

No Seasonal Clock Change

Puerto Rico does not observe daylight saving time, so there is no spring-forward or fall-back transition.

05 · IANA

America/Puerto_Rico

This is the location-specific IANA identifier to use for modern date-aware calculations.

06 · Eastern Time

Same Offset Does Not Mean Same Zone

AST and EDT can both equal UTC−04:00, but their names and rules are different. EST is UTC−05:00.

America/Puerto_Rico vs AST

America/Puerto_Rico is the IANA time-zone identifier for Puerto Rico. AST is the human-readable abbreviation for Atlantic Standard Time. They are related, but they are not interchangeable concepts.

America/Puerto_RicoUse this in software, scheduling systems and date-aware calculations when an IANA zone is supported.
ASTUse this as the common abbreviation for Puerto Rico's Atlantic Standard Time.
UTC−04:00Use this when the numeric offset itself is the task, while remembering that an offset alone does not preserve a location's history.
For future datesPrefer the IANA identifier so later rule changes can be represented by updated time-zone data.

Puerto Rico UTC Offset

Puerto Rico's current civil offset is UTC−04:00. That is four hours behind UTC. Because Puerto Rico does not make a seasonal clock change, the offset remains stable across the year under current rules.

12:00 UTCCorresponds to 8:00 a.m. in Puerto Rico at UTC−04:00.
16:00 UTCCorresponds to 12:00 noon in Puerto Rico at UTC−04:00.
00:00 UTCCorresponds to 8:00 p.m. on the previous calendar day in Puerto Rico.
Explore UTC Offsets UTC−4 Time Now
Visual Geography

See Puerto Rico on the Caribbean Time Zone Map

Puerto Rico does not need a separate city-by-city boundary map because the entire territory uses one time zone. The Caribbean Time Zone Map shows Puerto Rico's UTC−04:00 position alongside nearby islands and regional time-zone differences.

Open Caribbean Time Zone Map World Time Zone Map
Puerto Rico · AST · UTC−04:00

Looking for the Current Time in Puerto Rico?

This page explains Puerto Rico's time-zone rules. If your main question is what time it is in Puerto Rico or San Juan right now, use the dedicated live current-time pages.

Territory ClockCurrent Time in Puerto Rico CapitalCurrent Time in San Juan Regional ClocksTime in the Caribbean Global ClockWorld Clock

Sources & Methodology

Puerto Rico's AST / UTC−04:00 reference and no-DST status are checked against official U.S. time references. Live clocks and comparisons use browser-supported IANA time-zone data for each named location rather than a fixed manually entered difference.

NIST Time.gov — Puerto Rico / U.S. Virgin Islands, AST (UTC−4) NIST — Local Time FAQs and U.S. time zones NIST — Daylight Saving Time Rules IANA Time Zone Database — current civil-time rule data

Last reviewed: August 20, 2026 · IANA tzdb reference at review: 2026c. Time-zone legislation and database rules can change; live comparisons are calculated from the IANA zone for the current date.

Puerto Rico Time Zone FAQ

What time zone is Puerto Rico in?

Puerto Rico uses Atlantic Standard Time (AST), UTC−04:00, throughout the year. Its IANA identifier is America/Puerto_Rico.

Does Puerto Rico observe daylight saving time?

No. Puerto Rico does not observe daylight saving time and does not make a seasonal clock change.

Is Puerto Rico on Eastern Time?

No. Puerto Rico is on Atlantic Standard Time. U.S. Eastern Time is a separate zone family with its own rules and can use a different offset.

Is AST the same as EST?

No. AST is UTC−04:00, while EST is UTC−05:00. Puerto Rico is therefore one hour ahead of EST.

Is Puerto Rico the same time as New York?

Puerto Rico can match New York when New York's current offset is UTC−04:00. When New York is at UTC−05:00, Puerto Rico is one hour ahead. Check the live comparison for the selected date.

What is Puerto Rico's UTC offset?

Puerto Rico uses UTC−04:00 year-round under current rules.

What IANA time zone should I use for Puerto Rico?

Use America/Puerto_Rico in software and date-aware scheduling systems.

Does San Juan use the same time zone as the rest of Puerto Rico?

Yes. San Juan and all other Puerto Rico municipalities share AST at UTC−04:00 under current rules.

Is Puerto Rico the same time as the U.S. Virgin Islands?

Yes. Time.gov places Puerto Rico and the U.S. Virgin Islands on AST at UTC−04:00, and neither observes daylight saving time under current rules.

Why is Puerto Rico called AST if it never switches to ADT?

AST is the standard-time label for Puerto Rico's fixed UTC−04:00 civil time. A location can remain on standard time all year without switching to a daylight-time counterpart.