Unix Timestamp Converter translates between Unix epoch timestamps (seconds since 1970-01-01) and human-readable dates in your local timezone. Supports both second-precision (10-digit) and millisecond-precision (13-digit) timestamps — paste a number and get the formatted date instantly, or pick a date to get its epoch value. Useful for reading database fields, log files, and API responses. Runs in your browser.
A Unix timestamp (also called epoch time or POSIX time) is the number of seconds that have elapsed since 00:00:00 UTC on Thursday, 1 January 1970 — the "Unix epoch". It is a single integer that uniquely represents any moment in time regardless of timezone, making it the standard way to store and compare dates in databases, APIs, and log files.
Different systems use different precision. Unix/POSIX timestamps are in seconds (10-digit number as of 2025). JavaScript's Date.now() returns milliseconds (13 digits). Always check which unit an API expects — passing milliseconds where seconds are expected gives a date 1000× in the future.
0 — Unix epoch: 1970-01-01 00:00:00 UTC1000000000 — 2001-09-09 01:46:40 UTC (1 billion seconds)2147483647 — 2038-01-19 03:14:07 UTC (max value for 32-bit signed int — the "Year 2038 problem")4102444800 — 2100-01-01 00:00:00 UTC (common sentinel for "no expiry" in JWT exp claims)Also useful: Epoch Converter workspace, JWT Debugger.