What is the time difference between Tokyo and Denver?

Denver is 15 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 Denver from Tokyo?

There is no time inside normal working hours in both cities, so someone has to take the call outside them. The nearest workable windows are listed above — pick one and alternate who gets the awkward slot.

Does Tokyo observe daylight saving time?

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

Does Denver observe daylight saving time?

Yes. Denver runs on UTC-7 in winter and UTC-6 in summer. The next change is on 2026-11-01, when clocks go back by 60 minutes.

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

It is 21:00 in Denver, still on the previous day. That holds for the current offsets; it shifts by an hour around the daylight saving dates listed above.

Which time zones do Tokyo and Denver use?

Tokyo uses Asia/Tokyo, currently UTC+9, and Denver uses America/Denver, currently UTC-6 (MDT). Those identifiers are the ones to use in code — abbreviations are ambiguous and offsets change.

Convert Tokyo time to Denver time

Right now Denver runs 15 hours behind Tokyo. That gap is not fixed: it moves when either city changes its clocks.

Convert a time

From

Date

Time

Converted time

—

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 Tokyo, and what the clock reads in Denver at that same moment.

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

Daylight saving time

Tokyo keeps one offset all year while Denver moves twice. That is the whole reason this difference is seasonal.

Tokyo

Does not observe daylight saving time

Standard: UTC+9

Denver

Observes daylight saving time

Standard: UTC-7
Daylight: UTC-6
Next change: 2026-11-01 −60m

When you can actually talk

There is no hour where both cities are inside a 09:00–18:00 working day. Someone has to move — the nearest workable windows are below.

Tokyo 09:00–18:00Denver 18:00–03:00
Tokyo 00:00–09:00Denver 09:00–18:00

Reference

The zone identifiers and offsets behind everything above.

	Tokyo	Denver
IANA zone	Asia/Tokyo	America/Denver
Abbreviation	UTC+9	MDT
Standard offset	UTC+9	UTC-7
Daylight offset	—	UTC-6
Clock changes this year	0	2
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 Denver?: Denver is 15 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 Denver from Tokyo?: There is no time inside normal working hours in both cities, so someone has to take the call outside them. The nearest workable windows are listed above — pick one and alternate who gets the awkward slot.
Does Tokyo observe daylight saving time?: No. Tokyo stays on UTC+9 all year, so its clocks never move.
Does Denver observe daylight saving time?: Yes. Denver runs on UTC-7 in winter and UTC-6 in summer. The next change is on 2026-11-01, when clocks go back by 60 minutes.
If it is midday in Tokyo, what time is it in Denver?: It is 21:00 in Denver, still on the previous day. That holds for the current offsets; it shifts by an hour around the daylight saving dates listed above.
Which time zones do Tokyo and Denver use?: Tokyo uses Asia/Tokyo, currently UTC+9, and Denver uses America/Denver, currently UTC-6 (MDT). Those identifiers are the ones to use in code — abbreviations are ambiguous and offsets change.