Unix Timestamp Converter

Convert between Unix timestamps and readable dates.

A Unix timestamp counts the seconds since 1 January 1970 UTC. Put one line per value in the input — a timestamp, or a date such as 2024-03-01T12:00:00Z — and each is shown as seconds, milliseconds, ISO 8601 and a formatted local date. Ten-digit numbers are read as seconds and thirteen-digit as milliseconds, which is unambiguous for any date between 2001 and the year 5138.