America/Puerto_Rico is an IANA time zone used in Puerto Rico. It stays on UTC−4 all year.
America/Puerto_Rico at a glance
| UTC offset now | UTC−4 |
|---|---|
| Standard time | UTC−4 (AST) |
| Abbreviations | AST |
| Used in | Puerto Rico |
Rules of the America/Puerto_Rico time zone
This zone has a single offset, UTC−4, with no seasonal changes recorded since 1970.
Where America/Puerto_Rico is used
America/Puerto_Rico is used in Puerto Rico. These are the largest cities in our list that follow it.
America/Puerto_Rico compared with other time zones
Differences change during the year when one side moves to or from daylight saving time, so the table shows January and July separately.
| City | Time now | Difference now | In January | In July |
|---|---|---|---|---|
| New York (United States) | --:-- | 1 h behind | 1 h behind | Same time |
| Los Angeles (United States) | --:-- | 4 h behind | 4 h behind | 3 h behind |
| London (United Kingdom) | --:-- | 4 h ahead | 4 h ahead | 5 h ahead |
| Paris (France) | --:-- | 5 h ahead | 5 h ahead | 6 h ahead |
| Dubai (United Arab Emirates) | --:-- | 8 h ahead | 8 h ahead | 8 h ahead |
| Mumbai (India) | --:-- | 9 h 30 min ahead | 9 h 30 min ahead | 9 h 30 min ahead |
| Singapore | --:-- | 12 h ahead | 12 h ahead | 12 h ahead |
| Tokyo (Japan) | --:-- | 13 h ahead | 13 h ahead | 13 h ahead |
| Sydney (Australia) | --:-- | 15 h ahead | 15 h ahead | 14 h ahead |
| UTC | --:-- | 4 h ahead | 4 h ahead | 4 h ahead |
Other zones on UTC−4 right now
These IANA zones show the same time as America/Puerto_Rico today. Their clock-change rules may differ.
- America/Anguilla
- America/Antigua
- America/Aruba
- America/Barbados
- America/Boa_Vista
- America/Campo_Grande
- America/Caracas
- America/Cuiaba
- America/Curacao
- America/Dominica
- America/Glace_Bay
- America/Grenada
Using America/Puerto_Rico in software
Store and send the zone as its IANA name, America/Puerto_Rico, not as a fixed offset. A fixed offset such as UTC−4 gives the wrong result after the next clock change.
Show the current time in America/Puerto_Rico:
// JavaScript
new Intl.DateTimeFormat('en-GB', { timeZone: 'America/Puerto_Rico', timeStyle: 'long' }).format(new Date());
# Python
from datetime import datetime
from zoneinfo import ZoneInfo
datetime.now(ZoneInfo('America/Puerto_Rico'))
// PHP
(new DateTime('now', new DateTimeZone('America/Puerto_Rico')))->format('c');
# Shell
TZ=America/Puerto_Rico dateTools for time in America/Puerto_Rico
- Convert a time to or from America/Puerto_Rico: pick a date and time and see it in every city on your list.
- Add San Juan to your world clock to keep it next to your own time.
- Find a meeting time that falls inside office hours in America/Puerto_Rico and the other cities you work with.
- Open a full-screen clock for your own time zone.
Frequently asked questions
What is the UTC offset of America/Puerto_Rico?
UTC−4, all year.
What abbreviation does America/Puerto_Rico use?
AST. Abbreviations are not unique, so use the zone name America/Puerto_Rico in software.
Time zone rules: IANA tz database, version 2026e. Place names and coordinates: GeoNames. Sunrise and sunset are calculated from the coordinates and can differ by a minute or two from local almanacs.