San Francisco to Boston time converter

Boston is 3 hours ahead of San Francisco. When it is 9:00 AM in San Francisco, it is 12:00 PM in Boston.

San Francisco PDT

Tuesday, October 20, 2026

Boston EDT

Tuesday, October 20, 2026

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

San Francisco to Boston conversion table

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

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

Best time to call or meet

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

Daylight saving time and the difference

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

  • Oct 20, 2026 – Oct 31, 2026: +3h
  • Oct 31, 2026 – Nov 1, 2026: +2h
  • Nov 1, 2026 – Mar 13, 2027: +3h
  • Mar 13, 2027 – Mar 14, 2027: +4h
  • Mar 14, 2027 – Oct 20, 2027: +3h

Distance

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

More conversions

Boston to San FranciscoSan Francisco to New YorkSan Francisco to LondonSan Francisco to Los AngelesSan Francisco to ChicagoSan Francisco to TorontoSan Francisco to São PauloSan Francisco to ParisSan Francisco to BerlinSan Francisco to MoscowSan Francisco to DubaiSan Francisco to New DelhiSan Francisco to Bangkok
New York to BostonLondon to BostonLos Angeles to BostonChicago to BostonToronto to BostonSão Paulo to BostonParis to BostonBerlin to BostonMoscow to BostonDubai to BostonNew Delhi to BostonBangkok to Boston

Questions and answers

What is the time difference between San Francisco and Boston?

Boston is 3 hours ahead of San Francisco.

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

When it is 9:00 AM in San Francisco, it is 12:00 PM in Boston.

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

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

Does the time difference between San Francisco and Boston change?

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