What is the time difference between Honolulu and Tokyo?

Tokyo is 19 hours ahead of Honolulu. That figure is current — it changes by an hour when either city starts or ends daylight saving, and the exact dates are listed above.

When is the best time to call Tokyo from Honolulu?

Between 14:00–18:00 in Honolulu, which is 09:00–13:00 in Tokyo. That is the only stretch where both cities are inside a 09:00–18:00 day.

Does Honolulu observe daylight saving time?

No. Honolulu stays on UTC-10 all year, so its clocks never move.

Does Tokyo observe daylight saving time?

No. Tokyo stays on UTC+9 all year, so its clocks never move.

If it is midday in Honolulu, what time is it in Tokyo?

It is 07:00 in Tokyo, and already the following day. That holds for the current offsets; it does not change through the year, because neither city moves its clocks.

Which time zones do Honolulu and Tokyo use?

Honolulu uses Pacific/Honolulu, currently UTC-10 (HST), and Tokyo uses Asia/Tokyo, currently UTC+9. Those identifiers are the ones to use in code — abbreviations are ambiguous and offsets change.

Convert Honolulu time to Tokyo time

Right now Tokyo runs 19 hours ahead of Honolulu. That gap is not fixed: it moves when either city changes its clocks.

Convert a time

From

Date

Time

Converted time

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The converter needs JavaScript to run. Everything below — offsets, daylight saving dates and the hour-by-hour table — is part of the page and works without it.

Hour by hour

Every hour of a day in Honolulu, and what the clock reads in Tokyo at that same moment.

Honolulu	Tokyo
00:00	19:00
01:00	20:00
02:00	21:00
03:00	22:00
04:00	23:00
05:00	00:00next day
06:00	01:00next day
07:00	02:00next day
08:00	03:00next day
09:00	04:00next day
10:00	05:00next day
11:00	06:00next day
12:00	07:00next day
13:00	08:00next day
14:00	09:00next day
15:00	10:00next day
16:00	11:00next day
17:00	12:00next day
18:00	13:00next day
19:00	14:00next day
20:00	15:00next day
21:00	16:00next day
22:00	17:00next day
23:00	18:00next day

Daylight saving time

Both cities keep one offset all year. Whatever difference holds today still holds in six months.

Honolulu

Does not observe daylight saving time

Standard: UTC-10

Tokyo

Does not observe daylight saving time

Standard: UTC+9

When you can actually talk

You have 4 hours of shared working time: 14:00–18:00 in Honolulu, which is 09:00–13:00 in Tokyo.

Honolulu 14:00–18:00Tokyo 09:00–13:00

Reference

The zone identifiers and offsets behind everything above.

	Honolulu	Tokyo
IANA zone	Pacific/Honolulu	Asia/Tokyo
Abbreviation	HST	UTC+9
Standard offset	UTC-10	UTC+9
Daylight offset	—	—
Clock changes this year	0	0
Country	United States	Japan

Example, not the current time. Live times appear once the page loads.

Common questions

What is the time difference between Honolulu and Tokyo?: Tokyo is 19 hours ahead of Honolulu. That figure is current — it changes by an hour when either city starts or ends daylight saving, and the exact dates are listed above.
When is the best time to call Tokyo from Honolulu?: Between 14:00–18:00 in Honolulu, which is 09:00–13:00 in Tokyo. That is the only stretch where both cities are inside a 09:00–18:00 day.
Does Honolulu observe daylight saving time?: No. Honolulu stays on UTC-10 all year, so its clocks never move.
Does Tokyo observe daylight saving time?: No. Tokyo stays on UTC+9 all year, so its clocks never move.
If it is midday in Honolulu, what time is it in Tokyo?: It is 07:00 in Tokyo, and already the following day. That holds for the current offsets; it does not change through the year, because neither city moves its clocks.
Which time zones do Honolulu and Tokyo use?: Honolulu uses Pacific/Honolulu, currently UTC-10 (HST), and Tokyo uses Asia/Tokyo, currently UTC+9. Those identifiers are the ones to use in code — abbreviations are ambiguous and offsets change.