Timestamp Converter
Convert Unix seconds or milliseconds to local, UTC, and ISO dates.
Your input stays on this device and is processed in your browser.How to use Timestamp Converter
- Enter a whole Unix timestamp and choose its unit or automatic detection.
- Review the detected unit, browser timezone, and five representations.
- Copy any value or insert the current timestamp as a quick reference.
One moment, several formats
Unix time counts seconds from the first moment of 1970 in UTC, which makes it a single number with no timezone and no formatting to argue about. That is exactly why it is stored and exactly why nobody can read it.
Seconds and milliseconds are the trap. The two differ by a factor of a thousand, so a millisecond value read as seconds lands about fifty thousand years out, and a seconds value read as milliseconds lands in January 1970. A ten-digit number is almost always seconds and a thirteen-digit one milliseconds.
The local view uses this device's timezone and its daylight-saving rules, so the same number shown on two machines can read as two different clock times. Both are correct. When a moment has to mean one thing everywhere, quote the UTC or ISO form.
Frequently asked questions about Timestamp Converter
Are seconds and milliseconds supported?
Yes. Automatic mode detects common values, and the unit selector resolves ambiguous timestamps explicitly.
Which timezone is local time?
Local time names and uses the timezone configured in your browser and operating system.
What is ISO 8601?
It is a standardized UTC date and time representation suitable for APIs and data exchange.