| CITY | LOCAL TIME | Difference | Coming up |
|---|---|---|---|
| London United Kingdom | 01:00Thu | +5h | Becomes +4h on 25 Oct |
| Berlin Germany | 02:00Thu | +6h | Becomes +5h on 25 Oct |
| Dubai UAE | 04:00Thu | +8h | |
| Tokyo Japan | 09:00Thu | +13h | |
| Sydney Australia | 10:00Thu | +14h | Becomes +15h on 4 Oct |
| New York United States | 20:00 | ±0h | Becomes −1h on 1 Nov |
| Los Angeles United States | 17:00 | −3h | Becomes −4h on 1 Nov |
San Juan, Puerto Rico runs on UTC−4. This time zone stays fixed year-round at UTC−4 — daylight saving time is not observed. San Juan and New York currently share the same clock. Standard 9-to-6 working hours overlap for about 9 hours a day with New York. A good time to connect: 09:00–18:00 in San Juan lines up with 09:00–18:00 in New York. The time difference between San Juan and London is 5 hours. Standard 9-to-6 working hours overlap for about 4 hours a day with London. A good time to connect: 09:00–13:00 in San Juan lines up with 14:00–18:00 in London. The time difference between San Juan and Tokyo is 13 hours. Standard working hours don't overlap at all with Tokyo, so meetings need an early or late slot on one side. This timezone is also shared with cities such as Caracas, La Paz, Santo Domingo. Keeping these offsets in mind makes it easier to schedule calls or travel to and from San Juan.
San Juan (Puerto Rico) is home to roughly 2.4M people. Today brings about 12.0 hours of daylight: sunrise at 06:14, sunset at 18:14. This time zone stays fixed year-round at UTC−4 — daylight saving time is not observed. It sits in the Northern Hemisphere, about 18° north of the equator. Traffic drives on the right.
Flag
Puerto Rico
Capital
San Juan 👑
Continent
North America
Time Zone
AST · America/Puerto_Rico
Coordinates
18.47°N, 66.11°W
Currency
USD ($)
Calling Code
+1
Driving Side
Right
Hemisphere
Northern
Language
Spanish, English
Measurement System
Metric
Did You Know?
El Morro guards San Juan harbour across six levels rising about 44 metres above the sea, built between 1539 and 1790. It held off Francis Drake in 1595 and was only taken once, in 1598, by an English force that disease soon drove out. The Dutch besieged it in 1625 but failed to take it.
The clock: Puerto Rico keeps UTC−4 year-round with no daylight saving, which means it matches New York in summer and is an hour ahead in winter.
San Juan lies at 66.1°W. Its time zone, UTC−4, is built around the 60°W meridian. The 6.1° gap between them means the clock runs roughly 24 minutes ahead of the sun: solar noon arrives at about 12:24 rather than 12:00. The zone holds UTC−4 all year — there is no daylight saving here.
The longest day of 2026 is 22 June, with 13h 14m of daylight. The shortest is 22 December, with 11h 1m. The swing between them is 2h 13m. Inside the tropics the day length stays within a narrow band all year.
The earliest sunrise and the latest sunset do not land on the longest day. In San Juan the sun comes up earliest on 6 June at 05:47, while the latest sunset waits until 8 July at 19:05. The equation of time is what separates them: the Earth's elliptical orbit and axial tilt move solar noon back and forth by several minutes over the year.
The sky stays usably light for a while after the sun goes down. In San Juan that civil twilight runs about 22 minutes at the equinox.
Every figure in this section is computed from the city's own latitude, longitude and IANA time zone using NOAA solar algorithms (Spencer, 1971), accurate to about ±2 arcminutes below 65° latitude.
The official timezone for San Juan, Puerto Rico is America/Puerto_Rico with a current UTC offset of UTC−4.
San Juan has an estimated population of 2.4M and is located at coordinates 18.47°N, 66.11°W. It is the capital city of Puerto Rico.
San Juan gets 13h 14m of daylight on its longest day and 11h 1m on its shortest, averaging 12h 8m a day across the year.
Solar noon in San Juan falls at about 12:24 on UTC−4 standard time, because the city sits 6.1° from the meridian its zone is built on.
A Fort With Six Levels: El Morro guards San Juan harbour across six levels rising about 44 metres above the sea, built between 1539 and 1790.