The time difference between San Juan and San Francisco is 3 hours. When it is 12:00 noon in San Juan, it is 09:00 in San Francisco. San Juan uses the America/Puerto_Rico time zone (UTC-4), while San Francisco uses America/Los_Angeles (UTC-7).
| Detail | San Juan | San Francisco |
|---|---|---|
| Time Zone ID | America/Puerto_Rico | America/Los_Angeles |
| UTC Offset | UTC-4 | UTC-7 |
| Abbreviation | AST | PDT |
| DST Active | No | Yes — currently observing |
| Country | Puerto Rico | United States |
| Region | North America | North America |
There are 5 overlapping business hours between San Juan and San Francisco (assuming 9:00–17:00 in each city). The ideal window for calls and meetings is:
Use this table to quickly convert any hour from San Juan time to San Francisco time. Rows highlighted in green indicate overlapping business hours in both cities.
| San Juan | San Francisco | |
|---|---|---|
| 00:00 | 21:00 (-1 day) | Night |
| 01:00 | 22:00 (-1 day) | Night |
| 02:00 | 23:00 (-1 day) | Night |
| 03:00 | 00:00 | Night |
| 04:00 | 01:00 | Night |
| 05:00 | 02:00 | Night |
| 06:00 | 03:00 | |
| 07:00 | 04:00 | |
| 08:00 | 05:00 | |
| 09:00 | 06:00 | |
| 10:00 | 07:00 | |
| 11:00 | 08:00 | |
| 12:00 | 09:00 | Overlap |
| 13:00 | 10:00 | Overlap |
| 14:00 | 11:00 | Overlap |
| 15:00 | 12:00 | Overlap |
| 16:00 | 13:00 | Overlap |
| 17:00 | 14:00 | |
| 18:00 | 15:00 | |
| 19:00 | 16:00 | |
| 20:00 | 17:00 | |
| 21:00 | 18:00 | |
| 22:00 | 19:00 | Night |
| 23:00 | 20:00 | Night |
San Francisco is currently observing daylight saving time, while San Juan is on standard time. When San Francisco switches back to standard time, the difference between these two cities will shift by 1 hour.
The time difference is 3 hours. San Francisco is 3 hours behind San Juan.
Yes. One of these cities observes DST while the other does not, so the difference shifts by 1 hour when DST begins or ends.
The best window is between 12:00 and 17:00 San Juan time, which corresponds to 09:00–14:00 in San Francisco. Both sides fall within normal business hours.
Subtract 3 hours from San Juan time to get San Francisco time. Use the hour-by-hour table above for a quick reference.
For sunrise and sunset data, visit TheSunsetTimes.com. For detailed DST schedules, see DaylightSavingTime.info.