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Time difference between San Francisco and Boston

Boston is 3 hours ahead of San Francisco.

San Francisco
United States · Pacific Daylight Time
12:44 AM
Wednesday, October 21, 2026
Boston
United States · Eastern Daylight Time
3:44 AM
Wednesday, October 21, 2026
Compare more placesBoston to San Francisco

San Francisco to Boston time converter

Green rows are office hours in both places; light green rows are when both are awake.

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 (next day)
10:00 PM1:00 AM (next day)
11:00 PM2:00 AM (next day)

Questions

What is the time difference between San Francisco and Boston?

Boston is 3 hours ahead of San Francisco. San Francisco is on UTC−7 and Boston is on UTC−4.

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?

The best time to call or meet is 9:00 AM–3:00 PM in San Francisco (12:00 PM–6:00 PM in Boston), when both places are in normal office hours.

Does the time difference between San Francisco and Boston change?

Yes. Because of daylight saving time, the difference changes on Saturday, October 31, 2026, when Boston will be 2 hours ahead of San Francisco.

San Francisco is 3 hours behind Boston. More: time in San Francisco · time in Boston

Time difference from San Francisco to other cities

All San Francisco time differences →

Time difference from Boston