Los Angeles vs Tokyo Time Difference

Almost exactly opposite sides of the clock

Los Angeles and Tokyo sit close to 16–17 hours apart, which in daily life plays out as being almost exactly on opposite schedules — when one city is deep in its workday, the other is usually asleep. Unlike a pair where both sides observe daylight saving on different calendars, this one is simpler than it looks: Tokyo has held a fixed UTC+9 since 1886 (aside from a brief 1948–1951 DST experiment) and hasn't shifted since, so every bit of movement in this gap comes from one side only — Los Angeles.

That makes the LA-Tokyo relationship easy to reason about once you know the rule: the gap is 17 hours whenever Los Angeles is on Pacific Standard Time (roughly November to March) and 16 hours whenever it's on Pacific Daylight Time (roughly March to November). There's no mismatched-calendar complexity to track, as there would be comparing two DST-observing cities — just two fixed values and two clean transition dates, both set entirely by the US calendar.

Why the gap changes twice a year

Since Tokyo never moves its own clock, the only two moments the LA-Tokyo gap ever changes are the two dates Los Angeles's clock changes — both set by US federal law, not by any coordination with Japan.

Both dates above are calculated live from the actual US clock-change rule for this year, so they stay correct automatically without anyone updating this page.

Best time to call, hour by hour

The table below runs through a full Los Angeles day and shows the matching Tokyo time for each hour, with the rows where both cities fall inside a typical 9:00–17:00 workday highlighted — there usually aren't many.

Where the table shows no overlap, the practical workaround most teams use is an early-morning call on one side meeting a late-afternoon or evening slot on the other.

How we calculate this page: both live clocks, the current gap, the DST transition date, and the hour-by-hour overlap table are all computed directly from the IANA America/Los_Angeles and Asia/Tokyo time zone data via your browser on every page load.