Best overlap: 8:00 AM to 10:00 AM in Tokyo is 4:00 PM to 6:00 PM in San Diego.
Target 8:00 AM to 10:00 AM in Tokyo, which lands at 4:00 PM to 6:00 PM for the San Diego side. San Diego is 16 hours behind Tokyo, so common hours are scarce (about 2 hours). Lock the slot, keep it short, and follow up in writing. Mind the calendar: when you pick a time, San Diego will be on the previous day compared with Tokyo. For part of the year the maths changes: San Diego observes daylight saving, Tokyo does not, shifting the overlap by an hour.
| Local time | 12am | 1am | 2am | 3am | 4am | 5am | 6am | 7am | 8am | 9am | 10am | 11am | 12pm | 1pm | 2pm | 3pm | 4pm | 5pm | 6pm | 7pm | 8pm | 9pm | 10pm | 11pm |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Tokyo Asia/Tokyo | ||||||||||||||||||||||||
San Diego America/Los Angeles |
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