Time Zone Converter

Convert a date and time from one time zone to another, with daylight saving applied automatically for the date you choose.

Pick a date as well as a time — daylight saving means the difference between two cities is not the same all year.

Converted time

—

  • —Difference
  • —From offset
  • —To offset
  • —In UTC

    How Does It Work?

    1. Set the date as well as the timeThe gap between two cities changes across the year because they start and end daylight saving on different dates, so a conversion is only correct for a specific date.
    2. Choose the two zonesTwenty-five common business zones are listed by city. Swap them with one button when you need the answer the other way round.
    3. Read the resultYou get the converted time, the offset each zone is on for that date, and a clear note when the answer falls on a different calendar day.

    What Is It Used For?

    Time zone arithmetic goes wrong because the offset between two places is not a constant. The United States, Europe and Australia all change their clocks on different dates, and much of the world — including most of Asia, Africa and South America — does not change them at all. That produces short windows each spring and autumn when the usual difference is an hour out. This converter asks your browser for the real rules that applied on the date you chose, rather than assuming a fixed difference.

    • Scheduling a call with colleagues or clients in another country.
    • Working out when a webinar, launch or deadline lands in your own day.
    • Checking a flight arrival time expressed in local time at the destination.
    • Planning around a market open or a match kick-off announced in another zone.
    • Confirming a time near a clock change, when the usual difference does not hold.

    Examples

    Time and dateFromToResult
    09:00, 15 JuneMadridNew York03:00 same day
    09:00, 15 JuneLondonTokyo17:00 same day
    22:00, 15 JuneNew YorkLondon03:00 next day
    09:00, 15 JanuaryMadridNew York03:00 same day
    12:00, 15 JuneUTCMumbai / Delhi17:30 same day

    Frequently Asked Questions

    Why does the difference between two cities change during the year?

    Because daylight saving starts and ends on different dates in different countries. Europe changes on the last Sundays of March and October, while the United States changes on the second Sunday of March and the first in November, so for a few weeks each year the usual gap is an hour out.

    Does this handle daylight saving automatically?

    Yes. The conversion asks your browser for the actual rules in force on the date you selected, using the standard IANA time zone database, rather than applying a fixed offset.

    Why do I need to pick a date at all?

    Without a date there is no correct answer for any pair of zones that observe daylight saving. "New York is six hours behind Madrid" is true for most of the year but wrong in late March and late October.

    What does an offset like UTC+05:30 mean?

    It is how far that zone is from Coordinated Universal Time. India runs half an hour off the hour, at UTC+05:30, and Nepal runs at UTC+05:45 — which is why converting by whole hours alone produces wrong answers for parts of Asia.

    What happens to times that fall inside a clock change?

    When clocks spring forward, an hour does not exist locally and the conversion resolves to the nearest valid instant. When they fall back, an hour happens twice and the first occurrence is used. Both cases are rare and only affect a single hour a year.

    Free. No registration. This tool runs entirely in your browser, so the data you enter stays on your device.

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