San Juan runs on UTC−4 (AST) every day of the year, with no daylight saving time.
San Juan and your time
San Juan at a glance
| Country | Puerto Rico |
|---|---|
| Region | San Juan |
| Capital of | Puerto Rico |
| Time zone | America/Puerto_Rico |
| Abbreviation now | AST |
| UTC offset now | UTC−4 |
| Daylight saving time | Not observed |
| Coordinates | 18.47° N, 66.11° W |
San Juan time zone and clock changes
San Juan follows the America/Puerto_Rico time zone and stays on UTC−4 all year. The tz database records no daylight saving time here since 1970.
San Juan is the capital, and all of Puerto Rico keeps this time.
Clock changes in San Juan, 2026 and 2027
No clock changes are scheduled in San Juan for 2026 or 2027.
How far ahead or behind San Juan is
A 9:00 AM start in San Juan is 1:00 PM in London, 12:00 AM (next day) in Sydney and 5:00 AM in Los Angeles.
| City | Time now | Difference now | In January | In July | Shared office hours |
|---|---|---|---|---|---|
| New York (United States) | --:-- | 1 h behind | 1 h behind | Same time | 7 h |
| Los Angeles (United States) | --:-- | 4 h behind | 4 h behind | 3 h behind | 4 h |
| London (United Kingdom) | --:-- | 4 h ahead | 4 h ahead | 5 h ahead | 4 h |
| Paris (France) | --:-- | 5 h ahead | 5 h ahead | 6 h ahead | 3 h |
| Dubai (United Arab Emirates) | --:-- | 8 h ahead | 8 h ahead | 8 h ahead | None |
| Mumbai (India) | --:-- | 9 h 30 min ahead | 9 h 30 min ahead | 9 h 30 min ahead | None |
| Singapore | --:-- | 12 h ahead | 12 h ahead | 12 h ahead | None |
| Tokyo (Japan) | --:-- | 13 h ahead | 13 h ahead | 13 h ahead | None |
| Sydney (Australia) | --:-- | 15 h ahead | 15 h ahead | 14 h ahead | None |
| UTC | --:-- | 4 h ahead | 4 h ahead | 4 h ahead | 4 h |
Because San Juan keeps one offset all year, any change in the gap comes from the other city’s daylight saving time. Compare the January and July columns.
Shared office hours is the part of a 9 AM to 5 PM local working day that both cities have in common. Weekends are not taken into account.
Sunrise, sunset and day length in San Juan
Today
| Sunrise | --:-- |
|---|---|
| Sunset | --:-- |
| Day length | -- |
| Solar noon | --:-- |
Being in the tropics, San Juan sees little change in day length: the longest day (13 hours 14 minutes) is only 2 hours 13 minutes longer than the shortest (11 hours 1 minute). Sunrise stays between 5:47 AM and 7:00 AM all year.
Daylight through the year in San Juan
| Date | Sunrise | Sunset | Day length | |
|---|---|---|---|---|
| March equinox | March 20 | 6:28 AM | 6:35 PM | 12 h 7 min |
| June solstice | June 21 | 5:49 AM | 7:04 PM | 13 h 14 min |
| September equinox | September 22 | 6:13 AM | 6:21 PM | 12 h 7 min |
| December solstice | December 21 | 6:52 AM | 5:53 PM | 11 h 1 min |
When the sun is highest in San Juan
Clock time and sun time line up fairly well in San Juan: solar noon falls at about 12:25 PM on standard time.
Cities near San Juan
Every city below shares San Juan’s clock.
| City | Distance | Time now | Difference |
|---|---|---|---|
| Carolina | 18 km (11 mi) | --:-- | Same time |
| Ponce | 75 km (46 mi) | --:-- | Same time |
| Charlotte Amalie (U.S. Virgin Islands) | 125 km (78 mi) | --:-- | Same time |
| Road Town (British Virgin Islands) | 157 km (97 mi) | --:-- | Same time |
| St Croix (U.S. Virgin Islands) | 165 km (103 mi) | --:-- | Same time |
| Punta Cana (Dominican Republic) | 243 km (151 mi) | --:-- | Same time |
| Salvaleón de Higüey (Dominican Republic) | 275 km (171 mi) | --:-- | Same time |
Same time now, different rules
These places read the same time as San Juan today but follow different rules, so they can drift apart when clocks change.
Tools for time in San Juan
- Convert a time to or from San Juan: 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 San Juan and the other cities you work with.
- Open a full-screen clock for your own time zone.
Frequently asked questions
What time zone is San Juan in?
San Juan uses the America/Puerto_Rico time zone, which is UTC−4 (AST) all year.
Does San Juan use daylight saving time?
No. San Juan stays on UTC−4 all year, so the time difference to places without daylight saving time never changes.
What is the time difference between San Juan and London?
San Juan is 4 hours behind London in January and 5 hours behind London in July, because London moves its clocks for daylight saving time and San Juan does not.
How long is the longest day in San Juan?
About 13 hours 14 minutes, around the June solstice. The shortest day, around the December solstice, has about 11 hours 1 minute of daylight.
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.