San Diego to Tokyo Time Difference
Tokyo is 16 hours ahead of San Diego. When it's 05:57:52 AM in San Diego, it's 09:57:52 PM in Tokyo.
How Many Hours Ahead Is Tokyo From San Diego?
Tokyo is 16 hours ahead of San Diego. So San Diego is 16 hours behind Tokyo looking the other way — the same gap, described from the other end.
In practice that means a working day in San Diego starts when it is already 1:00 AM the next day in Tokyo. The gap is not fixed all year: it becomes 17 hours on Sunday, November 1, 2026, when San Diego changes its clocks.
Best Time to Call San Diego and Tokyo
Standard 9-to-5 hours in San Diego and Tokyo never overlap, so someone has to take the call outside their working day. The most workable window is 3:00 PM to 10:00 PM in San Diego, which is 7:00 AM to 2:00 PM in Tokyo.
both at work San Diego only Tokyo only neither — hours shown along the strip are San Diego local time.
Convert a Specific Time
Pick any date and time in San Diego to see the exact equivalent in Tokyo.
Common Times Converted
San Diego time on the left, Tokyo time on the right.
San Diego to Tokyo: Full 24-Hour Conversion Table
Based on today, Sunday, October 11, 2026 in San Diego. Shaded rows are working hours; the darker shade marks the hours when both cities are at work.
| San Diego | Tokyo | Working hours |
|---|---|---|
| 12:00 AM | 4:00 PM | Tokyo only |
| 1:00 AM | 5:00 PM | — |
| 2:00 AM | 6:00 PM | — |
| 3:00 AM | 7:00 PM | — |
| 4:00 AM | 8:00 PM | — |
| 5:00 AM | 9:00 PM | — |
| 6:00 AM | 10:00 PM | — |
| 7:00 AM | 11:00 PM | — |
| 8:00 AM | 12:00 AM next day | — |
| 9:00 AM | 1:00 AM next day | San Diego only |
| 10:00 AM | 2:00 AM next day | San Diego only |
| 11:00 AM | 3:00 AM next day | San Diego only |
| 12:00 PM | 4:00 AM next day | San Diego only |
| 1:00 PM | 5:00 AM next day | San Diego only |
| 2:00 PM | 6:00 AM next day | San Diego only |
| 3:00 PM | 7:00 AM next day | San Diego only |
| 4:00 PM | 8:00 AM next day | San Diego only |
| 5:00 PM | 9:00 AM next day | Tokyo only |
| 6:00 PM | 10:00 AM next day | Tokyo only |
| 7:00 PM | 11:00 AM next day | Tokyo only |
| 8:00 PM | 12:00 PM next day | Tokyo only |
| 9:00 PM | 1:00 PM next day | Tokyo only |
| 10:00 PM | 2:00 PM next day | Tokyo only |
| 11:00 PM | 3:00 PM next day | Tokyo only |
Understanding the San Diego – Tokyo Time Difference
San Diego runs on America/Los_Angeles, currently PDT (UTC-7:00). Tokyo runs on Asia/Tokyo, currently JST (UTC+9:00). The gap of 16 hours is simply the distance between those two offsets.
San Diego observes Daylight Saving Time and Tokyo does not, so the gap between them shifts by an hour twice a year. The next shift is on Sunday, November 1, 2026, when San Diego adjusts its clocks and the difference becomes 17 hours. Anything scheduled across that date needs checking again.
Full clock-change dates: Daylight Saving Time in the United States · Daylight Saving Time in Japan.
San Diego today
Tokyo today
Frequently Asked Questions
What is the time difference between San Diego and Tokyo?
Tokyo is currently 16 hours ahead of San Diego. That gap becomes 17 hours on Sunday, November 1, 2026, when San Diego changes its clocks.
How many hours ahead is Tokyo from San Diego?
Tokyo is 16 hours ahead of San Diego. Looking at it the other way, San Diego is 16 hours behind Tokyo.
What time is it in Tokyo when it is 9:00 AM in San Diego?
When it is 9:00 AM in San Diego, it is 1:00 AM the next day in Tokyo.
Is Tokyo ahead of or behind San Diego?
Tokyo is 16 hours ahead of San Diego. Tokyo reaches each point in the day first, so its working day is already finishing while San Diego is still getting started.
What is the best time to call between San Diego and Tokyo?
Standard business hours in San Diego and Tokyo do not overlap at all, so one side has to step outside the 9-to-5. The most workable window is 3:00 PM to 10:00 PM in San Diego, which is 7:00 AM to 2:00 PM in Tokyo.
Does the time difference between San Diego and Tokyo change during the year?
Yes. San Diego observes Daylight Saving Time and Tokyo does not, so the gap between them shifts during the year. It changes to 17 hours on Sunday, November 1, 2026.
What time zones are San Diego and Tokyo in?
San Diego uses the America/Los_Angeles time zone, currently PDT (UTC-7:00). Tokyo uses Asia/Tokyo, currently JST (UTC+9:00).