Time Zone Converter
Time Zone Converter: free, instant and private. Offsets are read from your browser’s own timezone database, so daylight-saving changes are handled for the date you entered — not for today.
How the Time Zone Converter works
The Time Zone Converter takes Date & time (local to From zone), From zone, To zone and returns the answer instantly — no button to hunt for, no page reload. Offsets are read from your browser’s own timezone database, so daylight-saving changes are handled for the date you entered — not for today. That matters when scheduling calls across the US and Europe.
Enter your own numbers to replace the example values; the result panel updates as you type. Everything runs in this single page, so nothing you enter leaves your device.
Formula used
target time = source wall-clock time − source UTC offset + target UTC offset
| Symbol | Meaning |
|---|---|
| date & time | the clock time in the source zone |
| from / to zone | the two IANA time zones |
Offsets are read from your browser’s own timezone database, so daylight-saving changes are handled for the date you entered — not for today. That matters when scheduling calls across the US and Europe.
Inputs used: Date & time (local to From zone), From zone, To zone.
Worked example
Take the default example — date & time (local to from zone) of 2026-01-01T09:00, from zone set to Asia/Kolkata, to zone set to America/New_York:
- Converted time: 31 Dec 2025, 22:30
- From: Asia/Kolkata
- To: America/New_York
Frequently asked questions
- What formula does the Time Zone Converter use?
- It uses target time = source wall-clock time − source UTC offset + target UTC offset, where date & time is the the clock time in the source zone; from / to zone is the the two IANA time zones.
- Is the Time Zone Converter free?
- Yes. There is no signup, no usage limit and no watermark — the converter runs entirely in your browser.
- How do I read the result?
- Offsets are read from your browser’s own timezone database, so daylight-saving changes are handled for the date you entered — not for today. That matters when scheduling calls across the US and Europe.
- Does the Time Zone Converter store or send my data?
- No. Every calculation happens locally in the page, so the numbers you type are never uploaded or logged.
- Does it work on a phone and offline?
- Yes — the page is a single lightweight file that adapts to any screen size. Once it has loaded it keeps working without a network connection.