Time Zone Converter
Convert time between 25+ major cities worldwide with automatic daylight saving time adjustments.
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Equivalent time worldwide
Showing the most-used cities. Search above to filter all 250+ zones.
Method
How this calculator works
A time zone is an offset from UTC. We anchor the wall-clock time you enter to a specific instant, then format that instant into every other supported time zone using the browser’s built-in time-zone database.
# Step 1: anchor wall-clock to UTC instant
instant = treat input as wall-clock in fromTz, then convert to UTC
# Step 2: format the instant in any target tz
output(tz) = formatInTimeZone(instant, tz)
# Behind the scenes
- Intl.DateTimeFormat with timeZone option handles DST, historical changes,
and offset abbreviations (IST, PT, GMT/BST, etc.)- Enter the date and time you want to convert (or click "Use current time" for now).
- Pick the source time zone — by default the calculator detects yours.
- The world-clock list updates instantly, showing the same instant in every supported city.
- Each row shows the local time, date, and time-zone abbreviation/offset.
- Toggle different source zones to see how a meeting at 9 AM in one city lands across teams worldwide.
Examples
Worked examples
Real numbers, end-to-end results.
9:00 AM Mumbai (IST)
11:30 PM previous day in Los Angeles · 4:30 AM London
5:00 PM Tokyo
8:00 AM London · 4:00 AM New York · 1:00 AM Los Angeles
Use cases
When to use it
- Schedule meetings across distributed teams without spreadsheet gymnastics.
- Plan calls with clients in different countries.
- Verify when a deadline expires "for them" if your contract specifies a remote time zone.
- Convert TV broadcast times, server cutover windows, or flight departures.
FAQ
Frequently asked questions
Does this handle daylight saving time?
Why are some times labeled with abbreviations like "IST" or "PT"?
Can I add my own time zone?
Why does the source time appear unchanged in the source row?
Methodology, assumptions & limitations
How we calculate: This calculator uses standard, peer-reviewed mathematical formulas implemented in TypeScript. All calculations run entirely in your browser — no data is sent to any server.
Assumptions: Unless stated otherwise, calculations assume constant rates over the specified period, no taxes or fees beyond those explicitly input, and standard compounding conventions for the formula type.
Limitations: Results are estimates for planning purposes. Real-world outcomes may differ due to variable rates, regulatory changes, taxes, fees, inflation, or other factors not modeled. This tool does not constitute professional advice.
When NOT to use this: Do not rely solely on this calculator for critical decisions where exact precision is required beyond the decimal places shown.
Feedback: Found an error or have a suggestion? Contact us — we review and correct reported issues within 48 hours.
Deep Dive Guide
How Time Zone Conversion Works — UTC Offsets, DST, and the International Date Line
A practical guide to time zone conversion. Understand UTC offsets, how daylight saving time shifts clocks, and how to schedule across time zones without confusion.
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