What is Unix Timestamp to Date?
A Unix timestamp (also called epoch time or POSIX time) is the number of seconds that have elapsed since January 1, 1970, 00:00:00 UTC, not counting leap seconds. It is the standard way to represent a moment in time in Unix-like operating systems, programming languages, databases, and APIs. JavaScript uses millisecond-precision timestamps (multiply by 1000 or divide by 1000 compared to POSIX). Unix timestamps are timezone-independent — a timestamp represents the same moment in time everywhere in the world, and conversion to a human-readable date requires knowing the target timezone. Timestamps appear in server log files (Apache, Nginx), database records (MySQL, PostgreSQL, MongoDB), HTTP headers (Expires, Last-Modified), JWT token exp and iat claims, and countless API responses.