Timestamp Converter
Convert Unix epoch timestamps to human dates and back.
A Unix timestamp (also called epoch time or POSIX time) counts the number of seconds elapsed since January 1, 1970, 00:00:00 UTC — the Unix epoch. It is the most widely used format for storing and transmitting date/time data in software systems.
Seconds vs milliseconds: Classic Unix timestamps are in seconds (10 digits for dates between 2001–2286). JavaScript, Java, and many APIs use milliseconds (13 digits). This tool auto-detects which format you entered.
Common uses: database datetime fields, REST API responses, log files, JWT token expiry (iat, exp claims), cache headers (Expires), file modification times.
Year 2038 problem: 32-bit signed integers overflow on January 19, 2038 (timestamp 2,147,483,647). Modern systems use 64-bit integers — this tool handles dates far beyond 2038.
About Timestamp Converter
Timestamp Converter converts Unix epoch timestamps to human-readable dates and back, entirely in your browser. Supports seconds and milliseconds, ISO 8601, UTC, and any IANA timezone. The live clock shows the current Unix timestamp ticking in real time. Nothing is sent to any server — all conversions happen locally using the native JavaScript Date API.