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Time Zone Calculator

Convert a date and time from one time zone to another. Pick a date, enter the time in 12- or 24-hour format, choose the From and To zones, and see the matching local time, day of the week, and UTC offset — with daylight saving handled automatically.

Date
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Format

What This Calculator Does

The time zone calculator converts a specific date and time from one place to another. You choose the date, type the time (in 12- or 24-hour format), and pick the From and To zones. The result shows the matching moment in the target zone, including the day of the week and the UTC offset — so you know exactly what the clock reads on the other side of the world.

Because you select real locations rather than fixed numbers, daylight saving time is handled automatically for the exact date you enter. The gap between two cities can shift by an hour depending on the season, and the calculator accounts for that.

How to Use It

  1. Pick the date — day, month, and year.
  2. Enter the time. Toggle between 12h and 24h format; in 12-hour mode, set AM or PM.
  3. Choose the From zone — the place your time belongs to.
  4. Choose the To zone — the place you want to convert into.
  5. Read the result. Use the ⇄ button to swap the two zones instantly.

The result updates as you type — there is no button to press.

A Worked Example

Say a video call is scheduled for 3:03 PM on Friday, July 31, 2026 in Berlin, and you want to know when that is in New York:

July 31, 2026, 3:03:00 PM (Friday) — Berlin · UTC +02:00

is the same time as

July 31, 2026, 9:03:00 AM (Friday) — New York · UTC −04:00

In late July both cities are on summer time, so the gap is six hours. In January — when neither observes daylight saving — the gap is the same six hours, but the individual offsets change to UTC+01:00 and UTC−05:00.

Time Zones of the World

Every zone is defined by its offset from Coordinated Universal Time (UTC), ranging from UTC−12:00 to UTC+14:00. The map below shows the world’s standard-time offsets.

Map of the world divided into standard time zones, labelled with their UTC offsets from UTC−12 to UTC+14.
World standard time zones by UTC offset — click to open the full-size map in a new tab.

Time Zones in the United States

The United States spans six main zones. Most observe daylight saving time from mid-March to early November; Hawaii and most of Arizona stay on standard time all year.

ZoneStandard offsetDaylight offsetExample city
Eastern (ET)UTC−05:00UTC−04:00New York
Central (CT)UTC−06:00UTC−05:00Chicago
Mountain (MT)UTC−07:00UTC−06:00Denver
Mountain (no DST)UTC−07:00UTC−07:00Phoenix
Pacific (PT)UTC−08:00UTC−07:00Los Angeles
Alaska (AKT)UTC−09:00UTC−08:00Anchorage
Hawaii (HT)UTC−10:00UTC−10:00Honolulu
Map of the United States divided into its time zones: Eastern, Central, Mountain, Pacific, Alaska, and Hawaii.
Time zones of the United States — click to open the full-size map in a new tab.

Daylight Saving Time, Explained

Daylight saving time (DST) shifts the clock forward one hour in spring and back one hour in autumn to make better use of evening daylight. The key thing for conversions is that not everywhere changes on the same day, and some places never change at all.

That is why the calculator asks for a real location instead of a plain offset: only the location knows whether DST was active on the date you chose. Enter a July date and a January date between the same two cities and you may see the offsets — and sometimes the hour gap — come out differently.

Why Use Locations Instead of Fixed Offsets

A fixed offset like “UTC−05:00” is only correct for part of the year in most places. Picking New York rather than UTC−05:00 lets the calculator apply the right rule for your date automatically, so you never have to remember when each region springs forward or falls back.

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Frequently Asked Questions

How do I convert time from one time zone to another?

Find the UTC offset of each zone, then add the difference to the original time. For example, New York in summer is UTC−04:00 and London is UTC+01:00, a five-hour gap — so 9:00 AM in New York is 2:00 PM in London. This calculator does it for you, including the daylight saving adjustment for the exact date you pick.

Does this calculator handle daylight saving time (DST)?

Yes. Because you choose a real location rather than a fixed offset, the calculator applies the daylight saving rules that were actually in effect on the date you enter. That is why the same two cities can be five hours apart in July but only four hours apart in January.

What is the difference between a UTC offset and a time zone?

A UTC offset is just a number, such as UTC−05:00, that tells you how far a clock is from Coordinated Universal Time. A time zone is a region that follows a set of rules, which usually includes switching between a standard offset and a daylight saving offset at set dates. New York, for instance, is UTC−05:00 in winter and UTC−04:00 in summer.

Why is the time difference between two cities not always the same?

Because the two places may start and end daylight saving on different dates — or one may not observe it at all. Arizona and most of Asia keep a fixed offset all year, so the gap between, say, London and Tokyo changes as the UK springs forward and falls back while Japan stays put.

How many time zones are there in the world?

There are 24 main time zones spaced one hour apart, but in practice there are around 38 UTC offsets in use because some regions use 30- or 45-minute offsets. India is UTC+05:30, Nepal is UTC+05:45, and parts of Australia use UTC+08:45.

What time zone is the United States in?

The contiguous United States spans four zones — Eastern (UTC−05:00), Central (UTC−06:00), Mountain (UTC−07:00), and Pacific (UTC−08:00) — plus Alaska (UTC−09:00) and Hawaii (UTC−10:00). Most of the country moves its clocks forward one hour for daylight saving time; Hawaii and most of Arizona do not.