Unix Timestamp Converter

A Unix timestamp is the number of seconds that have passed since 00:00:00 UTC on January 1, 1970, known as the Unix epoch. It is also called epoch time or POSIX time, and it is how most computers and programming languages store dates internally.

Paste the timestamp into the box above and the date appears instantly. The tool shows the UTC time, your local browser time, the ISO 8601 string, and a relative phrase like 3 hours ago.

Switch to the Date to timestamp tab, pick a date and time, choose the time zone they belong to, and the tool gives you the Unix time in seconds and milliseconds. Daylight saving transitions are handled automatically.

A seconds timestamp has 10 digits, like 1759362893, and counts whole seconds since the epoch. A milliseconds timestamp has 13 digits, like 1759362893123, and counts thousandths of a second. This tool auto-detects which one you pasted, and you can override it with the unit selector.

Conversions use the Intl.DateTimeFormat engine built into your browser with full IANA time zone data, so offsets and daylight saving changes are applied correctly for every date, past or future.

Relative time compares the timestamp with right now and phrases the difference in plain words, such as 30 seconds ago, in 5 minutes, 3 hours ago, or in 2 days.

Yes. Dates before the Unix epoch become negative timestamps. For example, one day before the epoch, 1969-12-31, is -86400 in seconds. The tool handles negative timestamps in both directions.

No. Every conversion runs in your browser with JavaScript only. Nothing you enter is sent to a server, stored, or logged.