Time Zone Converter
Convert time between different time zones
How to use
- Select source time zone
- Select target time zone
- Enter date and time
- View converted time and difference
Use cases
- International meetings
- Travel planning
- Remote work coordination
- Global events
About the Time Zone Converter
A time zone converter translates a wall-clock time in one zone to the equivalent moment in another zone, accounting for daylight saving time differences. Getting this right matters for scheduling international meetings — a naive implementation can silently mistime a meeting by an hour during DST transitions. This tool uses Intl.DateTimeFormat per-instant offset calculation, which is always correct.
Features
- DST-aware offset computed at the input datetime, not 'now'
- 13 common IANA zones (UTC, US, EU, APAC)
- Difference in hours + ISO UTC instant displayed
- Copy converted time in one click
- Intl.DateTimeFormat under the hood — always correct
How it works
- Enter the date and time.
- Pick the source ('From') time zone.
- Pick the target ('To') time zone.
- Read the converted time, offset, and UTC instant.
Frequently asked questions
Why is this different from other converters?
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Many naive converters use Date.getTimezoneOffset(), which returns today's offset — not the offset at your target datetime. During DST transitions (spring forward/fall back), that's wrong by an hour.
What about the US DST switch in November?
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2:00 AM EDT on switch day is a valid time; 2:30 AM EDT crosses into EST. Our converter computes the offset at that exact moment, so the math is correct.
Can I add more zones?
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The IANA database has 400+ zones. We're surfacing the 13 most common in the UI and adding a 'custom zone' input in a future update.
Does it handle historical dates?
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Yes, as long as your browser's ICU data includes the historical rules (most do). Pre-1970 dates may be approximate.
Is the time saved anywhere?
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No — conversion runs entirely in your browser.