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You can reopen and change your selection at any time. · 1.0.2
Use this time zone converter to convert dates and times from your time zone to as many others as you like, such as 15:00 in Berlin to 09:00 in New York and 22:00 in Tokyo. It accounts for daylight saving time on the selected date and shows when the date differs. It's free, requires no sign-up, and runs entirely in your browser.
Built by Julian Alker
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Example result
Choose a date, time, and source time zone. The time zone converter shows the corresponding time in every selected target zone, with its UTC offset, a zone abbreviation if your browser provides one, and a note if the date differs. The example below uses a fixed appointment; your results depend on your input.
Example · 2026-10-01 15:00 · Europe/Berlin
Input
Output
How it works
Five steps from your local time to a time zone comparison, with no sign-up required.
Step 1
Under “From”, your browser's time zone is already selected. To start from another time zone, click it and search for a city or IANA ID.
Step 2
Enter a date and time, optionally with seconds. Until you change it, the field follows the current time; “Use current date” resets it.
Step 3
Under “To”, UTC is selected by default; if you're in UTC, New York is selected instead. Choose the time zone you want to convert to.
Step 4
You'll see the date and time in the target zone, its UTC offset, a zone abbreviation if your browser provides one, and “+1 day” or “-1 day” if the date differs. The copy button copies the result and offset.
Step 5
Use “Add time zone” to add as many zones as you like. Each immediately shows the converted time. Click the X to remove a zone.
Why this tool
What the time zone converter handles for you, so you don't have to calculate it yourself.
Automatically detects your time zone
Your browser's time zone is already selected under “From.” You can change it at any time.
IANA time zones in your browser
Modern browsers offer hundreds of time zones from the IANA database, searchable by city or ID—not just a handful of major cities.
Daylight saving time for your date
Daylight saving and standard time are applied for the entered date, not just today's offset.
Day change indicator
“+1 day” or “-1 day” shows you immediately when it's already the next calendar day or still the previous one in a target zone.
Compare any number of time zones
Add as many target zones as you need and compare them at a glance.
Runs only in the browser
The conversion uses your browser's Intl API. Nothing is sent to a server or stored.
Understanding time zones
The key rules for converting time zones. All examples were calculated with the time zone converter above.
The time difference is the difference between the two UTC offsets. On 2026-10-01, Berlin is at UTC+02:00 and New York at UTC-04:00, so New York is 6 hours behind Berlin. The time zone converter shows each zone's offset, making the difference easy to see.
UTC is the reference time for all offsets. Germany, Austria, and Switzerland, as well as Paris, Madrid, Rome, Amsterdam, Warsaw, and Stockholm, use UTC+01:00 (CET) in winter and UTC+02:00 (CEST) in summer. 12:00 UTC is 13:00 there in winter and 14:00 in summer.
Europe changes clocks on the last Sunday in March and October; the US does so on the second Sunday in March and the first Sunday in November. New York is usually 6 hours behind Berlin, but only 5 hours behind on 2026-10-28. The time zone converter always uses the offsets that apply on the entered date.
Search works with cities and IANA IDs, not abbreviations. Choose a city in the zone: New York for Eastern Time, Chicago for Central Time, Denver for Mountain Time, and Los Angeles for Pacific Time. Eastern Time is 3 hours ahead of Pacific Time; Phoenix, Arizona, does not observe daylight saving time.
If the converted time falls on the next calendar day in the target zone, the converter shows “+1 day”; if it falls on the previous day, it shows “-1 day”. Pacific/Kiritimati is the furthest ahead at UTC+14:00, where each new day begins first.
Each result shows an IANA ID such as Europe/Berlin or America/New_York, which programming languages and databases also use to identify time zones. The copied time includes the UTC offset, useful for logs, tickets, and schedules in UTC.
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FAQ
Quick answers about UTC, daylight saving time, date changes, and this tool.
Yes, it's completely free, requires no sign-up, and has no limit on the number of time zones. Conversion runs through your browser's Intl API; your date, time, and time zones are neither sent to a server nor stored.
The same time in all selected destination time zones, each with its UTC offset and an indication when the date changes. For 2026-10-01 at 15:00 in Berlin (UTC+02:00), the tool shows, for example, 13:00 UTC, 09:00 in New York (UTC-04:00), 22:00 in Tokyo, and 02:00 in Auckland, where it is already 2026-10-02 (“+1 day”). It accounts for daylight saving and standard time automatically.
Select UTC under “From”, enter a date and time, then choose your city under “To”, such as Berlin. The converter uses the offset that applies on that date: 13:00 UTC on 2026-10-01 is 15:00 in Berlin (UTC+02:00). To convert in the other direction, leave your city under “From”; “To” defaults to UTC.
Yes. The converter uses your browser's IANA time zone data to check whether daylight saving or standard time applies on the entered date, rather than simply using today's offset. This matters especially during the weeks when Europe and the US change clocks on different dates.
The converted time falls on the next calendar day in that zone, or on the previous day if you see “-1 day”. The reference point is the date in your source time zone. This matters, for example, when an evening appointment in Europe falls on the next morning in Tokyo or Sydney.
As many as you like. Choose the main target zone under “To”, then use “Add time zone” to add more. Each zone appears only once in the comparison and can be removed with the X.
Search for a city or IANA ID in the selection window, such as “Tokyo” or “Europe/Vienna”. Names follow the English spelling in the IANA database, such as “Warsaw” or “Sao Paulo” for Brasília time. The tool does not search for abbreviations such as EST or CET: choose a city in the zone, such as New York for Eastern Time or Los Angeles for Pacific Time.
From your browser or operating system's time zone setting, which the tool reads through the Intl API. It's selected by default under “From”. You can choose another time zone there at any time.
Any more questions?
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