Timestamp Converter
Convert between Unix timestamps, ISO 8601, and local/UTC date-time. Runs entirely in your browser.
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About Timestamp Converter
A Unix timestamp counts the seconds (or milliseconds) since 1 January 1970 UTC. This tool converts between that number, ISO 8601 strings, and readable local and UTC date-time.
How to use it
- Enter a Unix timestamp to see the equivalent local and UTC date-time.
- Or enter a date-time to get the timestamp back.
- Check whether your value is in seconds or milliseconds — the tool handles both.
- Copy whichever representation you need.
Frequently asked questions
- Seconds or milliseconds?
- Unix timestamps are traditionally in seconds. JavaScript's Date.now() returns milliseconds. A 13-digit number is almost always milliseconds; a 10-digit number is seconds.
- Which timezone is used?
- Conversions are shown in both UTC and your browser's local timezone.
- Does it account for leap seconds?
- No. Like Unix time itself, it treats every day as exactly 86,400 seconds.