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Calculators · Updated October 25, 2026 · Reviewed by FormatFlow Editorial

Time Zone Converter — Convert Any Time Between Zones

You can convert a date and time from one time zone to another, see the exact local time, both UTC offsets and whether the calendar date changes, with daylight saving handled automatically.

Runs in your browserFree · No sign-up · No watermark
Time zonesRuns in your browser
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Everything runs locally in this tab. No file is uploaded while the tool loads.

This tool runs in your tab. Nothing is uploaded and no copy is stored.

How files are handled

At a glance

Works with
Time zones
Processing
In your browser
Price
Free, no account
Updated
October 25, 2026
All Calculators

About Time Zone Converter

A time zone converter answers a question that looks simple until daylight saving, date lines and half-hour offsets get involved. Enter a date and a 24-hour time in the source zone, pick the destination, and the tool shows what that exact instant looks like on a clock and calendar there, plus the UTC offsets and the number of hours between the two places.

The conversion uses the browser's own IANA time zone data, so daylight saving transitions follow the rules in force for the chosen date rather than a fixed offset. The result also points out when the calendar date differs by a day, which is the usual way a late-evening meeting in Asia turns into an early-morning call in the Americas. Everything runs locally, with no server lookup.

What this tool does

The details that matter when you use Time Zone Converter for real work.

  • 43 labelled time zones

    Pick from 43 common IANA zones across the Americas, Europe, Africa, Asia and Oceania, with UTC included.

  • Daylight saving handled

    Offsets follow the tz rules for the chosen date, so summer and winter conversions use the correct UTC offset.

  • UTC offsets shown

    Both zones display their UTC offset for that instant, which makes the arithmetic easy to check.

  • Date-change warning

    When the destination falls on the previous or next calendar day, the result says so explicitly.

  • One-click swap

    Swap the source and destination zones to convert the same instant in the opposite direction.

  • Runs offline

    The conversion uses only built-in browser APIs, so it keeps working after the page loads without a network.

How to use Time Zone Converter

No account, no installation — the whole job happens in this browser tab.
  1. 01

    Pick the date and time

    Enter the calendar date and a 24-hour time in the source zone; the page starts with the current time there.

  2. 02

    Choose the source zone

    Select the zone the time is written in from the From list.

  3. 03

    Choose the destination zone

    Select the zone you want to see the same instant in from the To list.

  4. 04

    Read the converted time

    The result shows the local date and time, both UTC offsets, the hour difference and any calendar-day change.

  5. 05

    Swap to check the reverse

    Use the swap button to confirm the reverse conversion, or to see what the same meeting is back home.

How this tool works

Works with
Time zones
Processing
Client-side, in your browser. Nothing is uploaded.
Requirements
Chrome, Edge, Firefox or Safari · JavaScript and Intl time zone data enabled

Limitations worth knowing

  • The zone list covers 43 major IANA zones, not every city or every IANA identifier.
  • Daylight-saving rules come from the browser's tz database and can lag behind the latest government changes.
  • A repeated fall-back hour cannot be distinguished from a single wall time; convert the UTC time when that matters.
  • Historical dates before standard time zones are approximate and should be checked against an authoritative source.

Privacy and file handling

The date, time and zones you choose are processed in your browser with Intl.DateTimeFormat. Nothing is sent to a server, no lookup is made, and no history is kept; closing the page leaves no record of the times you converted.

Read the full privacy policy

Time Zone Converter FAQ

Short, direct answers to the questions people ask before using this tool.
How does the converter handle daylight saving time?
It uses the browser's IANA time zone data for the exact date you enter, so a zone on summer time shows its summer offset and a winter date shows its winter offset. The rules follow the tz database shipped with the browser.
Why does a city's UTC offset change during the year?
Offsets change when a region switches to or from daylight saving time. New York is UTC−5 in winter and UTC−4 in summer, while Shanghai stays at UTC+8 all year, so the same wall time can map to a different instant in different months.
What happens if I enter a time that does not exist because the clocks moved forward?
The tool detects the gap and tells you the local time is invalid in that zone instead of silently moving it. Pick a time after the transition, for example one hour later, and the conversion will run.
What about the repeated hour when the clocks go back?
A fall-back hour happens twice, and a wall-clock time alone cannot say which one you mean. The converter returns one valid instant and labels it; if the distinction matters, convert the UTC time instead.
Can I convert a meeting time for several people at once?
Not in one pass: the tool converts between two zones at a time. Use the swap button to check the reverse direction, or run it once per participant with their zone as the destination.
Why is the time difference not always a whole number of hours?
Some zones use half-hour or 45-minute offsets, such as India at UTC+5:30, Nepal at UTC+5:45 and parts of Australia at UTC+9:30. The difference shown includes those minutes.
Does the converter use my computer's own time zone?
Only as a starting point: the source zone defaults to Shanghai and the destination to New York. The browser's own zone is not used unless you select it, and the calculation depends only on the two zones you choose.
Are historical dates converted with the right rules?
The IANA data covers past transitions, but very old dates can predate standard time or reflect rules that changed later. Treat historical conversions as best effort and verify unusual dates against an authoritative source.