timenow.online

Time difference between Boston and San Francisco

San Francisco is 3 hours behind Boston.

Boston
United States · Eastern Daylight Time
3:46 AM
Wednesday, October 21, 2026
San Francisco
United States · Pacific Daylight Time
12:46 AM
Wednesday, October 21, 2026
Compare more placesSan Francisco to Boston

Boston to San Francisco time converter

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

BostonSan Francisco
12:00 AM9:00 PM (previous day)
1:00 AM10:00 PM (previous day)
2:00 AM11:00 PM (previous 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

Questions

What is the time difference between Boston and San Francisco?

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

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?

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

Does the time difference between Boston and San Francisco change?

Yes. Because of daylight saving time, the difference changes on Sunday, November 1, 2026, when San Francisco will be 2 hours behind Boston.

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

Time difference from Boston to other cities

All Boston time differences →

Time difference from San Francisco