Unix Timestamp Converter
Epoch ↔ date, both directions, seconds or milliseconds.About Unix timestamps
A Unix timestamp counts the seconds elapsed since 1 January 1970 00:00:00 UTC (the "epoch"). It is timezone-free by definition — the same instant is the same number everywhere — which is why databases, log files and APIs use it so widely. JavaScript and Java measure in milliseconds instead, so their values are 1000× larger; the converter detects millisecond inputs automatically by length.
The converter shows each timestamp in your local timezone, in UTC and as ISO 8601, plus a relative ("3 days ago") reading. Everything runs in your browser — nothing is sent to a server. Note for 32-bit systems: signed 32-bit timestamps overflow on 19 January 2038, the so-called Y2038 problem.