Turn a Unix timestamp into a readable date in UTC and your own time zone, or turn a date into a timestamp. Seconds, milliseconds, microseconds, and nanoseconds are recognized automatically.
It is the number of seconds since midnight UTC on 1 January 1970, called the Unix epoch. It is the same everywhere in the world, which makes it a common way to store times in software.
By its length. Timestamps for current dates have 10 digits in seconds and 13 digits in milliseconds. The tool shows which unit it used, so you can check.
A date and time without a time zone, such as 2026-01-31 14:30, is read as your local time. Add Z for UTC, such as 2026-01-31T14:30:00Z, or an offset such as +02:00.
Older systems store timestamps as a signed 32-bit number of seconds, which runs out on 19 January 2038. Most current systems use 64-bit numbers, which last for billions of years.
You can also come chat with us on the Stoic Dreams discord server.