Tokyo is 16 hours ahead of Los Angeles. Put the other way round: Los Angeles is 16 hours behind Tokyo.
Los Angeles is UTC-7 in summer and UTC-8 in winter; Tokyo is UTC+9 and UTC+9.
A nine-to-five in Los Angeles and a nine-to-five in Tokyo do not overlap at all. Somebody has to move: the nearest workable slots are early morning in one city or late evening in the other, which is the kind of thing the planner is for.
Los Angeles changes its clocks for summer and Tokyo does not, so there is no single answer: the gap is 16 hours for the northern summer and 17 hours for the rest of the year.
| Los Angeles | Tokyo |
|---|---|
| 08:00 | 00:00 next day |
| 09:00 | 01:00 next day |
| 10:00 | 02:00 next day |
| 11:00 | 03:00 next day |
| 12:00 | 04:00 next day |
| 13:00 | 05:00 next day |
| 14:00 | 06:00 next day |
| 15:00 | 07:00 next day |
| 16:00 | 08:00 next day |
| 17:00 | 09:00 next day |
| 18:00 | 10:00 next day |
This page covers one pair. TimeGap takes a list: add every city you care about, drag one marker, and every row reads the same instant on its own clock. It marks the hours you would actually take a call, finds the window where the most people are reachable, flags public holidays, and puts the time you pick straight into Outlook or Google Calendar.