Time difference between San Diego and Tokyo
17 hours
Tokyo is 17 hours ahead of San Diego.
Does daylight saving change it?
Yes. In winter the gap is 17 hours; in summer it is 16 hours. Only San Diego observes daylight saving.
Overlapping work hours
Between 16:00 and 18:00 in San Diego, Tokyo is also at work — 2 hours a day.
San Diego time → Tokyo time
| 00:00 | 17:00 |
|---|---|
| 01:00 | 18:00 |
| 02:00 | 19:00 |
| 03:00 | 20:00 |
| 04:00 | 21:00 |
| 05:00 | 22:00 |
| 06:00 | 23:00 |
| 07:00 | 00:00next day |
| 08:00 | 01:00next day |
| 09:00 | 02:00next day |
| 10:00 | 03:00next day |
| 11:00 | 04:00next day |
| 12:00 | 05:00next day |
| 13:00 | 06:00next day |
| 14:00 | 07:00next day |
| 15:00 | 08:00next day |
| 16:00 | 09:00next day |
| 17:00 | 10:00next day |
| 18:00 | 11:00next day |
| 19:00 | 12:00next day |
| 20:00 | 13:00next day |
| 21:00 | 14:00next day |
| 22:00 | 15:00next day |
| 23:00 | 16:00next day |
Standard time (January). During daylight saving each row shifts by an hour.
Frequently asked questions
Q. How many hours is San Diego ahead of Tokyo?
17 hours on standard time. During daylight saving it becomes 16 hours, an hour more or less.
Q. What time is it in Tokyo when it is noon in San Diego?
Read the 12:00 row of the 24-hour table below. The table is on standard time, so each row shifts an hour during daylight saving.
Q. When should we schedule a meeting?
The two cities' work hours (09:00–18:00) overlap for 2 hours a day. Anything inside that window catches both sides at work.