Utility
Time Zone Converter
A modern world clock and time-zone converter. Enter a time in one city and see the equivalent in every major city instantly, with daylight-saving and offset metadata.
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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?
Yes. We use the browser’s Intl.DateTimeFormat API, which knows the rules for every IANA time zone — including DST transitions and historical changes.
Why are some times labeled with abbreviations like "IST" or "PT"?
Those are the locale-specific short names for each zone (IST = India Standard Time, PT = Pacific Time). They change automatically based on whether DST is in effect.
Can I add my own time zone?
Right now the dropdown shows ~25 of the most-used cities. If you need a specific city, contact us — we’ll add it. Behind the scenes the engine supports every IANA time zone identifier.
Why does the source time appear unchanged in the source row?
Because that is the time you entered, in its native time zone. Every other row shows what that exact instant looks like elsewhere in the world.