Time difference
Boston to San Francisco Time Difference
San Francisco is 3 hours behind Boston — when it's 12:00 PM in Boston, it's 9:00 AM in San Francisco. (Boston (America/New_York, EDT); San Francisco (America/Los_Angeles, PDT).) Below: live local times, the best hours for a call, a full conversion table, and exact daylight-saving dates.
San Francisco is 3 hours behind Boston. The best window for a call is 12 PM–5 PM in Boston, which is 9 AM–2 PM in San Francisco — a 5-hour overlap inside 9 AM–5 PM on both sides. Boston and San Francisco change their clocks together (or don't change at all), so the time difference between them stays the same all year.
- When it's 9:00 AM in Boston, it's 6:00 AM in San Francisco.
- When it's 9:00 AM in San Francisco, it's 12:00 PM in Boston.
San Francisco is currently 3 hours behind Boston.
Interactive converter
12:00PM
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Best times to meet
The 9 AM – 5 PM business windows in Boston and San Francisco overlap for 5 hours. 12 PM–5 PM in Boston is 9 AM–2 PM in San Francisco. Aim somewhere in the middle of that window so neither side starts cold or finishes drained.
Quick conversion table
| Boston | San Francisco |
|---|---|
| 12 AM | 9:00 PM (prev day) |
| 1 AM | 10:00 PM (prev day) |
| 2 AM | 11:00 PM (prev day) |
| 3 AM | 12:00 AM |
| 4 AM | 1:00 AM |
| 5 AM | 2:00 AM |
| 6 AM | 3:00 AM |
| 7 AM | 4:00 AM |
| 8 AM | 5:00 AM |
| 9 AM | 6:00 AM |
| 10 AM | 7:00 AM |
| 11 AM | 8:00 AM |
| 12 PM | 9:00 AM |
| 1 PM | 10:00 AM |
| 2 PM | 11:00 AM |
| 3 PM | 12:00 PM |
| 4 PM | 1:00 PM |
| 5 PM | 2:00 PM |
| 6 PM | 3:00 PM |
| 7 PM | 4:00 PM |
| 8 PM | 5:00 PM |
| 9 PM | 6:00 PM |
| 10 PM | 7:00 PM |
| 11 PM | 8:00 PM |
Daylight saving
On November 1, 2026, both Boston and San Francisco shift for daylight saving. After that, San Francisco will be 3 hours behind Boston (currently 3 hours behind Boston). The converter and the tables above always reflect the correct offset for the date you pick.
- Boston is currently observing daylight saving time.
- San Francisco is currently observing daylight saving time.
Frequently asked questions
- Is San Francisco ahead of or behind Boston?
- San Francisco is 3 hours behind Boston.
- How many hours behind Boston is San Francisco?
- San Francisco is 3 hours behind Boston.
- What time is 9 AM in Boston in San Francisco?
- 9:00 AM in Boston is 6:00 AM in San Francisco.
- What time is noon in Boston in San Francisco?
- 12:00 PM in Boston is 9:00 AM in San Francisco.
- What time is 5 PM in Boston in San Francisco?
- 5:00 PM in Boston is 2:00 PM in San Francisco. Useful for end-of-day handoffs between the two offices.
- What time is 3 PM in Boston in San Francisco?
- 3:00 PM in Boston is 12:00 PM in San Francisco.
- Is Boston currently observing daylight saving time?
- Boston is currently observing daylight saving time (summer time).
- Is San Francisco currently observing daylight saving time?
- San Francisco is currently observing daylight saving time (summer time).
- Do Boston and San Francisco observe daylight saving?
- On November 1, 2026, both Boston and San Francisco shift for daylight saving. After that, San Francisco will be 3 hours behind Boston (currently 3 hours behind Boston). The converter and the tables above always reflect the correct offset for the date you pick.
- When is the best time to call San Francisco from Boston?
- Aim for 12 PM–5 PM in Boston, which is 9 AM–2 PM in San Francisco.
- When is the best time to call Boston from San Francisco?
- Aim for 9 AM–2 PM in San Francisco, which is 12 PM–5 PM in Boston.
- Boston (EDT) to San Francisco (PDT) — how do I convert quickly?
- Subtract 3 hours from Boston local time to get San Francisco local time. Or use the converter at the top of this page — it stays accurate through daylight-saving changes automatically.
Other conversions
- Boston to New York
- Boston to London
- Boston to Tokyo
- Boston to Dubai
- Boston to Singapore
- Boston to Los Angeles
- Boston to Sydney
- Boston to Paris
- Boston to Mumbai
- Boston to Hong Kong