Ottawa to San Francisco Time Difference
San Francisco is 3 hours behind Ottawa. When it's 09:34:04 AM in Ottawa, it's 06:34:04 AM in San Francisco.
How Many Hours Behind Is San Francisco From Ottawa?
San Francisco is 3 hours behind Ottawa. So Ottawa is 3 hours ahead of San Francisco looking the other way — the same gap, described from the other end.
In practice that means a working day in Ottawa starts when it is already 6:00 AM in San Francisco. The gap is not fixed all year: it becomes 2 hours on Sunday, November 1, 2026, when Ottawa changes its clocks.
Best Time to Call Ottawa and San Francisco
Both cities are inside normal business hours between 12:00 PM and 5:00 PM in Ottawa — that's 9:00 AM to 2:00 PM in San Francisco. That's a 5-hour window, so a call fits comfortably in either side's working day.
both at work Ottawa only San Francisco only neither — hours shown along the strip are Ottawa local time.
Convert a Specific Time
Pick any date and time in Ottawa to see the exact equivalent in San Francisco.
Common Times Converted
Ottawa time on the left, San Francisco time on the right.
Ottawa to San Francisco: Full 24-Hour Conversion Table
Based on today, Sunday, October 11, 2026 in Ottawa. Shaded rows are working hours; the darker shade marks the hours when both cities are at work.
| Ottawa | San Francisco | Working hours |
|---|---|---|
| 12:00 AM | 9:00 PM prev day | — |
| 1:00 AM | 10:00 PM prev day | — |
| 2:00 AM | 11:00 PM prev day | — |
| 3:00 AM | 12:00 AM | — |
| 4:00 AM | 1:00 AM | — |
| 5:00 AM | 2:00 AM | — |
| 6:00 AM | 3:00 AM | — |
| 7:00 AM | 4:00 AM | — |
| 8:00 AM | 5:00 AM | — |
| 9:00 AM | 6:00 AM | Ottawa only |
| 10:00 AM | 7:00 AM | Ottawa only |
| 11:00 AM | 8:00 AM | Ottawa only |
| 12:00 PM | 9:00 AM | Both cities |
| 1:00 PM | 10:00 AM | Both cities |
| 2:00 PM | 11:00 AM | Both cities |
| 3:00 PM | 12:00 PM | Both cities |
| 4:00 PM | 1:00 PM | Both cities |
| 5:00 PM | 2:00 PM | San Francisco only |
| 6:00 PM | 3:00 PM | San Francisco only |
| 7:00 PM | 4:00 PM | San Francisco only |
| 8:00 PM | 5:00 PM | — |
| 9:00 PM | 6:00 PM | — |
| 10:00 PM | 7:00 PM | — |
| 11:00 PM | 8:00 PM | — |
Understanding the Ottawa – San Francisco Time Difference
Ottawa runs on America/Toronto, currently EDT (UTC-4:00). San Francisco runs on America/Los_Angeles, currently PDT (UTC-7:00). The gap of 3 hours is simply the distance between those two offsets.
Both cities observe Daylight Saving Time, but they don't switch on the same date — so for a few weeks each year the gap between them is different again. The next shift is on Sunday, November 1, 2026, when Ottawa adjusts its clocks and the difference becomes 2 hours. Anything scheduled across that date needs checking again.
Full clock-change dates: Daylight Saving Time in Canada · Daylight Saving Time in the United States.
Ottawa today
San Francisco today
Frequently Asked Questions
What is the time difference between Ottawa and San Francisco?
San Francisco is currently 3 hours behind Ottawa. That gap becomes 2 hours on Sunday, November 1, 2026, when Ottawa changes its clocks.
How many hours behind is San Francisco from Ottawa?
San Francisco is 3 hours behind Ottawa. Looking at it the other way, Ottawa is 3 hours ahead of San Francisco.
What time is it in San Francisco when it is 9:00 AM in Ottawa?
When it is 9:00 AM in Ottawa, it is 6:00 AM in San Francisco.
Is San Francisco ahead of or behind Ottawa?
San Francisco is 3 hours behind Ottawa. Ottawa reaches each point in the day first, so San Francisco is still getting started while the Ottawa working day is finishing.
What is the best time to call between Ottawa and San Francisco?
Between 12:00 PM and 5:00 PM Ottawa time, which is 9:00 AM to 2:00 PM in San Francisco. Both cities are inside normal business hours during that window.
Does the time difference between Ottawa and San Francisco change during the year?
Yes. Both cities observe Daylight Saving Time, and they do not always switch on the same date, so the gap between them shifts during the year. It changes to 2 hours on Sunday, November 1, 2026.
What time zones are Ottawa and San Francisco in?
Ottawa uses the America/Toronto time zone, currently EDT (UTC-4:00). San Francisco uses America/Los_Angeles, currently PDT (UTC-7:00).