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Timezone Converter🔒 100% local
Convert time across multiple timezones simultaneously. Privacy-first, no server uploads.
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Takes one wall-clock time, a source timezone and any number of target zones, and prints that time in each target. You set the time, choose the From zone, and multi-select the zones to convert to before pressing Convert Time.
How to use it
- Set the time with the 24-hour picker.
- Choose the From Timezone.
- In the Convert To list, hold Ctrl or Cmd and click each zone you want, then press Convert Time.
Worked example
12:00 from America/New_York to Europe/London, Asia/Tokyo, America/Los_AngelesbecomesSource: America/New_York - 12:00
Europe/London: 12:00
Asia/Tokyo: 21:00
America/Los_Angeles: 04:00
Actual output from a machine set to London with the clock frozen at 2026-01-15. Midday in New York is 17:00 in London, so the London line is wrong by the five-hour source offset - see limits.
When to use it
- Finding a meeting slot that works for a team spread across three regions.
- Checking what time a scheduled call lands on for a colleague abroad.
- Reading a support rota published in one city's local time against several other offices.
What it does not do
- The conversion ignores the source zone's UTC offset. It relabels the digits you typed as if they were your own local time, so the answer is only right when your machine sits in the same zone as the From field. From New York to London it prints 12:00 where the correct answer is 17:00.
- The result depends on the current date, because the code reads today's daylight-saving state; the same input can print different numbers in summer and winter.
- There is no date field, so you cannot plan a conversion for a specific future date or check a past one.
- The Convert To control is a browser multi-select: zones only change when you hold Ctrl or Cmd while clicking, and reloading the page resets it to its three defaults.