What is the time difference between Denver and Tokyo?

Tokyo is 15 hours ahead of Denver. 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 Denver?

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 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.

Does Tokyo observe daylight saving time?

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

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

It is 03:00 in Tokyo, and already the following day. That holds for the current offsets; it shifts by an hour around the daylight saving dates listed above.

Which time zones do Denver and Tokyo use?

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

Convert Denver time to Tokyo time

Tokyo is 15 hours ahead of Denver right now, so midday in Denver lands in the small hours in Tokyo.

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

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

Daylight saving time

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

Denver

Observes daylight saving time

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

Tokyo

Does not observe daylight saving time

Standard: UTC+9

When you can actually talk

A standard working day in Denver and one in Tokyo do not overlap at all. Any call between them is early for one side or late for the other.

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

Reference

The underlying data, in case you need to put it in a calendar invitation or a configuration file.

	Denver	Tokyo
IANA zone	America/Denver	Asia/Tokyo
Abbreviation	MDT	UTC+9
Standard offset	UTC-7	UTC+9
Daylight offset	UTC-6	—
Clock changes this year	2	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 Denver and Tokyo?: Tokyo is 15 hours ahead of Denver. 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 Denver?: 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 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.
Does Tokyo observe daylight saving time?: No. Tokyo stays on UTC+9 all year, so its clocks never move.
If it is midday in Denver, what time is it in Tokyo?: It is 03:00 in Tokyo, and already the following day. That holds for the current offsets; it shifts by an hour around the daylight saving dates listed above.
Which time zones do Denver and Tokyo use?: Denver uses America/Denver, currently UTC-6 (MDT), and Tokyo uses Asia/Tokyo, currently UTC+9. Those identifiers are the ones to use in code — abbreviations are ambiguous and offsets change.