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    Time Zone Converter

    Convert times between 25+ world time zones instantly. Handles daylight saving time automatically.

    Free to use. Runs in your browser.

    Enter a date/time, pick source and target time zones, then click Convert to see the converted time.

    How Time Zones Actually Work

    The world is divided into 24 primary time zones, each roughly 15 degrees of longitude wide. UTC (Coordinated Universal Time) is the reference, every zone is defined as an offset from UTC. New York is UTC-5 in winter, UTC-4 in summer. London is UTC+0 in winter, UTC+1 in summer. Tokyo is UTC+9 all year (Japan doesn't observe DST).

    This converter uses your browser's Intl API and the IANA timezone database, the same source your phone and computer rely on. It handles daylight saving transitions automatically, so you don't have to remember which regions are currently shifted.

    Major City Time Offsets

    Standard offsets for the cities people convert most. Remember: DST shifts these by +1 hour where observed.

    CityZone NameUTC Offset (Standard)UTC Offset (DST)
    Los AngelesPacific (PST/PDT)UTC-8UTC-7
    DenverMountain (MST/MDT)UTC-7UTC-6
    ChicagoCentral (CST/CDT)UTC-6UTC-5
    New YorkEastern (EST/EDT)UTC-5UTC-4
    LondonGMT/BSTUTC+0UTC+1
    Paris / BerlinCET/CESTUTC+1UTC+2
    DubaiGulf (GST)UTC+4No DST
    MumbaiISTUTC+5:30No DST
    SingaporeSGTUTC+8No DST
    TokyoJSTUTC+9No DST
    SydneyAEST/AEDTUTC+10UTC+11
    AucklandNZST/NZDTUTC+12UTC+13

    The Daylight Saving Trap

    DST causes more scheduling disasters than any other time issue. The problem isn't that clocks shift, it's that they shift on different dates in different countries. Here's what catches people out:

    Trap 1

    US and Europe switch on different weeks

    The US springs forward in early March, Europe in late March. For 2-3 weeks, the time difference between London and New York is 4 hours instead of the usual 5. The same thing happens in reverse in November. Your recurring meeting shifts by an hour and nobody notices until someone misses it.

    Trap 2

    Southern Hemisphere flips the other way

    Australia and New Zealand spring forward when the Northern Hemisphere falls back. In January, Sydney is 16 hours ahead of New York. In July, it's only 14. The gap changes twice a year and not on the same dates.

    Trap 3

    Some places don't observe DST at all

    Arizona (except the Navajo Nation), Hawaii, Japan, China, India, Singapore, and most of Africa and South America stay on standard time year-round. When everyone else shifts, the gap with these places changes by an hour.

    Trap 4

    Half-hour and 45-minute offsets exist

    India is UTC+5:30. Nepal is UTC+5:45. Iran is UTC+3:30. Parts of Australia use UTC+9:30. You can't just count whole hours to figure out the time, always use a converter for these zones.

    Meeting Overlap Windows

    Finding a time that works across continents is the hardest part of remote work. Here are the realistic overlap windows for common combinations:

    UK ↔ US East Coast

    5 hours apart. Best overlap: 2-5pm London = 9am-12pm New York. Both in normal business hours.

    UK ↔ US West Coast

    8 hours apart. Tough overlap: 4-6pm London = 8-10am Los Angeles. Only 2-3 usable hours per day.

    US East ↔ India

    10.5 hours apart. Best overlap: 8-10am New York = 6:30-8:30pm Mumbai. Early morning US, late evening India.

    UK ↔ Australia

    10-11 hours apart. Best overlap: 7-9am London = 5-7pm Sydney. First thing UK morning, end of Australian workday.

    US East ↔ Japan

    14 hours apart. Almost no overlap. 8am New York = 10pm Tokyo. Most teams use async communication.

    Europe ↔ US West Coast

    9 hours apart. Narrow window: 5-6pm Berlin = 8-9am San Francisco. One-hour window at best.

    Tips for Working Across Time Zones

    • Always specify the time zone when scheduling. "Let's meet at 3pm" means nothing without a zone. Use "3pm GMT" or "3pm ET" to avoid confusion. Better yet, include two zones: "3pm London / 10am New York."
    • Pin a world clock to your desktop. Add the cities you work with most. Knowing the current time in your colleague's location prevents the "I didn't realise it was 11pm for you" moment.
    • Watch out for DST transition weeks. Set calendar reminders for the weeks when your country and your collaborator's country switch clocks. These are the highest-risk periods for missed meetings.
    • Use UTC for shared deadlines. If your team spans 3+ time zones, set deadlines in UTC. Everyone converts once, and there's no ambiguity about which "end of day" applies.

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    How to use this tool

    1

    Enter the date and time you want to convert

    2

    Select the source and destination time zones

    3

    Click Convert to see the adjusted date and time

    Common uses

    • Scheduling meetings across international teams
    • Converting flight departure times to local time
    • Coordinating live events for a global audience
    • Tracking cryptocurrency market hours worldwide

    Share this tool

    Frequently Asked Questions

    Does this handle daylight saving time?
    Yes. Conversions use the browser's Intl API, which accounts for DST transitions in each time zone automatically using the IANA timezone database.
    What time zones are supported?
    We include 25+ major zones covering every continent. The converter uses IANA identifiers (like America/New_York) so results are always accurate.
    Is the conversion accurate for future dates?
    Yes. The browser's Intl.DateTimeFormat handles future DST rules as defined by your operating system's timezone data.
    Can I convert a specific date and time?
    Enter any date and time in the first field, pick your source and target zones, then click Convert. It works for past, present, and future dates.
    What is UTC?
    UTC (Coordinated Universal Time) is the global time standard. It doesn't observe daylight saving time. All other time zones are expressed as offsets from UTC, like UTC+1 or UTC-5.
    What is the time difference between London and New York?
    London is normally 5 hours ahead of New York (EST). During DST transitions in March and November, the gap briefly narrows to 4 hours because the US and UK switch clocks on different dates.
    Why do some countries have half-hour time zones?
    Countries like India (UTC+5:30), Iran (UTC+3:30), and parts of Australia chose offsets that better match their solar noon. Nepal even uses UTC+5:45, the only 45-minute offset.
    Which countries don't use daylight saving time?
    Most countries near the equator don't use DST, including most of Africa, South America, and Southeast Asia. China, Japan, India, and Russia also don't observe DST.
    What is the International Date Line?
    The International Date Line runs roughly along the 180° meridian in the Pacific Ocean. Crossing it westward advances the calendar by one day; crossing eastward sets it back one day.
    How many time zones does the US have?
    The US mainland has 4 time zones: Eastern (UTC-5), Central (UTC-6), Mountain (UTC-7), and Pacific (UTC-8). Alaska and Hawaii add two more.
    When do clocks change for DST?
    In the US, clocks spring forward on the second Sunday of March and fall back on the first Sunday of November. In Europe, changes happen on the last Sundays of March and October.
    What is GMT and how is it different from UTC?
    GMT (Greenwich Mean Time) is a time zone based on solar time at Greenwich, London. UTC is a precise atomic time standard. In practice, they're the same, GMT = UTC+0, but UTC is the official scientific reference.

    Results are for general informational purposes only and should be checked before use. They are not professional advice. See our Disclaimer and Terms of Service.