Unix Timestamp Converter

A Unix timestamp counts the seconds since 00:00:00 UTC on January 1, 1970, a moment called the Unix epoch. This converter turns a timestamp into a readable date and a date back into a timestamp. For example, 1700000000 is 2023-11-14T22:13:20Z, a Tuesday.

Paste a timestamp and click Convert. The tool guesses the unit from the size of the number. Up to 11 digits is read as seconds, 13 digits as milliseconds (what JavaScript's Date.now() returns), 16 as microseconds and 19 as nanoseconds. When it reads anything other than seconds, a note says so. You then see the time as ISO 8601, a UTC string, your local time, the date, the time, the weekday and a relative phrase such as 3 days ago.

The Date to Timestamp box works the other way. Pick a date and time, down to the second, and you get the timestamp in seconds and in milliseconds. The picker uses your local time zone, so the same clock time gives a different timestamp in London and in Tokyo. A live clock at the top shows the current timestamp, ticking every second.

Timestamps are popular because they ignore time zones: one number means the same instant everywhere. You find them in databases, log files, API responses and JWT claims. The usual trap is mixing up seconds and milliseconds, which puts a date in 1970 or far in the future. The table lists some well-known values. For gaps between dates, try the Date Difference Calculator, and for local times in other cities, the Timezone Converter.