What is the time difference between Tokyo and Honolulu?

Honolulu is 19 hours behind Tokyo. 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 Honolulu from Tokyo?

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

Does Tokyo observe daylight saving time?

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

Does Honolulu observe daylight saving time?

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

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

It is 17:00 in Honolulu, still on the previous day. That holds for the current offsets; it does not change through the year, because neither city moves its clocks.

Which time zones do Tokyo and Honolulu use?

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

Convert Tokyo time to Honolulu time

Honolulu is 19 hours behind Tokyo right now, so midday in Tokyo lands in the afternoon in Honolulu.

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

The whole day mapped across: read down the left for Tokyo, across for Honolulu.

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

Daylight saving time

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

Tokyo

Does not observe daylight saving time

Standard: UTC+9

Honolulu

Does not observe daylight saving time

Standard: UTC-10

When you can actually talk

The window is 4 hours wide — 09:00–13:00 in Tokyo, 14:00–18:00 in Honolulu.

Tokyo 09:00–13:00Honolulu 14:00–18:00

Reference

The zone identifiers and offsets behind everything above.

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

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

Common questions

What is the time difference between Tokyo and Honolulu?: Honolulu is 19 hours behind Tokyo. 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 Honolulu from Tokyo?: Between 09:00–13:00 in Tokyo, which is 14:00–18:00 in Honolulu. That is the only stretch where both cities are inside a 09:00–18:00 day.
Does Tokyo observe daylight saving time?: No. Tokyo stays on UTC+9 all year, so its clocks never move.
Does Honolulu observe daylight saving time?: No. Honolulu stays on UTC-10 all year, so its clocks never move.
If it is midday in Tokyo, what time is it in Honolulu?: It is 17:00 in Honolulu, still on the previous day. That holds for the current offsets; it does not change through the year, because neither city moves its clocks.
Which time zones do Tokyo and Honolulu use?: Tokyo uses Asia/Tokyo, currently UTC+9, and Honolulu uses Pacific/Honolulu, currently UTC-10 (HST). Those identifiers are the ones to use in code — abbreviations are ambiguous and offsets change.