Time Zone Converter
Convert any date and time between 25+ world time zones instantly. Includes a live world clock for 6 major cities.
Time Zone Converter
World Clock
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The time zone converter translates any date and time between 25+ world time zones instantly. Enter a date and time, choose your source and destination time zones from the dropdown — the result shows the converted time, the UTC offset for both zones, and the time difference between them. A world clock panel also shows current time in six major cities. Time zone conversion is a surprisingly error-prone mental task. Getting it right matters: missing a client call because you confused EST with EDT, or booking a flight for the wrong day because you forgot a time zone crosses midnight, are real and common mistakes. This tool handles daylight saving time automatically — if DST is in effect for the selected date in either time zone, the correct adjusted offset is applied. The converter is particularly useful for scheduling international meetings. Enter the proposed meeting time in your local time zone and check what it is for participants in New York, London, Dubai, and Singapore simultaneously — the world clock panel makes multi-region scheduling straightforward.
How to Use the Time Zone Converter
The Time Zone Converter is designed to give you an accurate answer in seconds. Follow these steps:
- 1Enter your details into the input fields above.
- 2Adjust any settings, toggles, or unit selections to match your situation.
- 3Your results appear automatically — review the output and adjust any inputs to explore different scenarios.
No account or sign-up required. All calculations run locally in your browser — nothing is stored or transmitted to any server.
How It Works
Converted Time = Input Time − Source UTC Offset + Target UTC Offset (DST applied automatically)
The converter uses the browser's built-in Intl.DateTimeFormat API with IANA timezone names (e.g., "America/New_York", "Asia/Kolkata"). The IANA timezone database includes full DST rules for every time zone, so the conversion is always accurate for the specific date entered — no manual DST adjustment needed. UTC offset is determined by formatting a date as UTC and as the target timezone, then calculating the difference. The offset changes with the season for zones that observe DST — for example, New York is UTC−5 in winter (EST) and UTC−4 in summer (EDT). Example: 9:00 AM New York on 15 July (summer). New York = UTC−4 (EDT). London = UTC+1 (BST). Difference = +5 hours. 9:00 AM New York = 2:00 PM London. Same conversion on 15 January (winter): New York = UTC−5 (EST). London = UTC+0 (GMT). 9:00 AM New York = 2:00 PM London. (Same result here — both zones shift together by 1 hour.)
Frequently Asked Questions
What is the difference between UTC and GMT?
UTC (Coordinated Universal Time) is the modern international time standard, set by atomic clocks and adjusted for Earth's rotation. GMT (Greenwich Mean Time) is the historical time at the Greenwich meridian in London. For practical purposes, UTC and GMT are the same offset (UTC+0), though GMT is a time zone while UTC is a time standard. Most technical systems use UTC; GMT is commonly used in everyday conversation to describe the same thing.
How do I schedule a meeting across time zones?
Enter your proposed meeting time and your local time zone, then check what time that is in each participant's time zone using the converter. A common approach: pick a time during overlap hours — typically 9 AM–12 PM in one zone that falls in working hours for the other. For US East + UK meetings, 9 AM New York = 2 PM London (5 hours apart in winter, 4 hours in summer when DST overlaps). For US West + Europe, the gap is 8–9 hours, making overlap very narrow.
Does the converter account for daylight saving time?
Yes — automatically. The converter uses the IANA timezone database via the browser's Intl API, which includes full DST rules for every time zone. Enter any date and it will apply the correct DST adjustment for that specific date. This matters because different countries switch to DST on different dates — the US and EU switch 2–3 weeks apart, creating a brief window each spring and autumn where the offset between them changes.
How do I find my time zone?
Your device's settings show your current time zone. On Windows: Settings → Time & Language → Date & Time. On Mac: System Preferences → Date & Time → Time Zone. On iPhone/Android: Settings → General (or System) → Date & Time. Alternatively, your time zone is usually listed on official government or national weather service websites. The IANA timezone name format is Region/City (e.g., "Europe/London" or "America/New_York").
How many time zones are there in the United States?
The contiguous US has four main time zones: Eastern (UTC−5/−4), Central (UTC−6/−5), Mountain (UTC−7/−6), and Pacific (UTC−8/−7). Adding Alaska (UTC−9/−8) and Hawaii (UTC−10, no DST) makes six. Outlying territories add more: Puerto Rico (UTC−4, no DST), Guam (UTC+10), American Samoa (UTC−11). Additionally, parts of Indiana, Arizona, and other states have historically had non-standard rules — Arizona does not observe DST (except the Navajo Nation).