Turn a Unix timestamp into a real date, or a date into a timestamp. It runs in your browser and detects seconds, milliseconds or microseconds automatically.
A Unix timestamp is a single number: the count of seconds that have elapsed since 00:00:00 UTC on 1 January 1970 (an instant called the "Unix epoch"). Because it is one plain number in UTC with no time-zone attached, it is an unambiguous way for computers to store and exchange a moment in time. To read it, you convert it back into a calendar date in whatever time zone you care about — that is what this page does.
Different systems store the same instant at different resolutions. Plain Unix time counts seconds (10 digits for dates around now). JavaScript and many databases use milliseconds (13 digits), and some high-precision systems use microseconds (16 digits). This converter looks at the size of the number you paste and picks the most likely unit, then tells you which one it used.
ISO 8601 is the international standard format for writing a date and time, like 2026-01-31T14:05:00Z. The T separates the date from the time and a trailing Z means UTC. It sorts correctly as text and is unambiguous across regions, which is why APIs and log files favour it.
No. All conversion happens in your browser with the built-in date functions. The value you enter is also stored in the page's URL (after the #) so you can bookmark or share a specific timestamp — that fragment is never sent to a server either.