Boston to San Francisco time converter

San Francisco is 3 hours behind Boston. When it is 9:00 AM in Boston, it is 6:00 AM in San Francisco.

Boston EDT

Tuesday, October 20, 2026

San Francisco PDT

Tuesday, October 20, 2026

Boston
Massachusetts, United States
Tue, Oct 20
EDTUTC-4
San Francisco
California, United States
Tue, Oct 20
PDTUTC-7-3h
Finding your time zone…
Shared working hours (9:00–18:00)

Boston to San Francisco conversion table

Every hour of today in Boston and the matching time in San Francisco. Light rows are typical working hours (9:00–18:00).

BostonSan Francisco
12:00 AM9:00 PM−1 day
1:00 AM10:00 PM−1 day
2:00 AM11:00 PM−1 day
3:00 AM12:00 AM
4:00 AM1:00 AM
5:00 AM2:00 AM
6:00 AM3:00 AM
7:00 AM4:00 AM
8:00 AM5:00 AM
9:00 AM6:00 AM
10:00 AM7:00 AM
11:00 AM8:00 AM
12:00 PM9:00 AM
1:00 PM10:00 AM
2:00 PM11:00 AM
3:00 PM12:00 PM
4:00 PM1:00 PM
5:00 PM2:00 PM
6:00 PM3:00 PM
7:00 PM4:00 PM
8:00 PM5:00 PM
9:00 PM6:00 PM
10:00 PM7:00 PM
11:00 PM8:00 PM

Best time to call or meet

Both sides are at work from 12:00 PM – 6:00 PM in Boston (9:00 AM – 3:00 PM in San Francisco).

Daylight saving time and the difference

The difference changes during the year because Boston and San Francisco switch clocks on different dates:

  • Oct 20, 2026 – Nov 1, 2026: -3h
  • Nov 1, 2026 – Nov 1, 2026: -2h
  • Nov 1, 2026 – Mar 14, 2027: -3h
  • Mar 14, 2027 – Mar 14, 2027: -4h
  • Mar 14, 2027 – Oct 20, 2027: -3h

Distance

Boston and San Francisco are 4,334 km (2,693 miles) apart in a straight line.

More conversions

San Francisco to BostonBoston to New YorkBoston to LondonBoston to Los AngelesBoston to ChicagoBoston to TorontoBoston to São PauloBoston to ParisBoston to BerlinBoston to MoscowBoston to DubaiBoston to New DelhiBoston to Bangkok
New York to San FranciscoLondon to San FranciscoLos Angeles to San FranciscoChicago to San FranciscoToronto to San FranciscoSão Paulo to San FranciscoParis to San FranciscoBerlin to San FranciscoMoscow to San FranciscoDubai to San FranciscoNew Delhi to San FranciscoBangkok to San Francisco

Questions and answers

What is the time difference between Boston and San Francisco?

San Francisco is 3 hours behind Boston.

What time is it in San Francisco when it is 9 AM in Boston?

When it is 9:00 AM in Boston, it is 6:00 AM in San Francisco.

When is the best time to call San Francisco from Boston?

Both sides are at work from 12:00 PM – 6:00 PM in Boston (9:00 AM – 3:00 PM in San Francisco).

Does the time difference between Boston and San Francisco change?

Yes, for part of the year, because daylight saving time starts and ends on different dates or applies on one side only.