When it is 12:00 PM in Boston, it is 9:00 PM the previous day in San Francisco.
📞There is no overlap during standard 9-to-5 business hours, so a call may need to be early or late in the day for one side.
Boston is 15 hours ahead of San Francisco.
🕐 Subtract 15 hours from Boston time to get San Francisco time.
Boston uses 8 hours ahead of Universal Time (UTC+8) and San Francisco uses 7 hours behind Universal Time (UTC-7).
| Boston Time | San Francisco Time | |
|---|---|---|
| 12 AM Boston Time | ↔ | ☼ 9 AM San Francisco Time |
| 1 AM Boston Time | ↔ | ☼ 10 AM San Francisco Time |
| 2 AM Boston Time | ↔ | ☼ 11 AM San Francisco Time |
| 3 AM Boston Time | ↔ | ☼ 12 PM San Francisco Time |
| 4 AM Boston Time | ↔ | ☼ 1 PM San Francisco Time |
| ☼ 5 AM Boston Time | ↔ | ☼ 2 PM San Francisco Time |
| ☼ 6 AM Boston Time | ↔ | ☼ 3 PM San Francisco Time |
| ☼ 7 AM Boston Time | ↔ | ☼ 4 PM San Francisco Time |
| ☼ 8 AM Boston Time | ↔ | ☼ 5 PM San Francisco Time |
| ☼ 9 AM Boston Time | ↔ | ☼ 6 PM San Francisco Time |
| ☼ 10 AM Boston Time | ↔ | ☼ 7 PM San Francisco Time |
| ☼ 11 AM Boston Time | ↔ | ☼ 8 PM San Francisco Time |
| Boston Time | San Francisco Time | |
|---|---|---|
| ☼ 12 PM Boston Time | ↔ | 9 PM San Francisco Time |
| ☼ 1 PM Boston Time | ↔ | 10 PM San Francisco Time |
| ☼ 2 PM Boston Time | ↔ | 11 PM San Francisco Time |
| ☼ 3 PM Boston Time | ↔ | 12 AM San Francisco Time |
| ☼ 4 PM Boston Time | ↔ | 1 AM San Francisco Time |
| ☼ 5 PM Boston Time | ↔ | 2 AM San Francisco Time |
| 6 PM Boston Time | ↔ | 3 AM San Francisco Time |
| 7 PM Boston Time | ↔ | 4 AM San Francisco Time |
| 8 PM Boston Time | ↔ | ☼ 5 AM San Francisco Time |
| 9 PM Boston Time | ↔ | ☼ 6 AM San Francisco Time |
| 10 PM Boston Time | ↔ | ☼ 7 AM San Francisco Time |
| 11 PM Boston Time | ↔ | ☼ 8 AM San Francisco Time |
Boston is 15 hours ahead of San Francisco.
Boston is ahead of San Francisco by 15 hours.
It is 6:00 PM the previous day in San Francisco.