Core log · strata · law of superposition
Epoch/Human Date Converter
Type a Unix timestamp or pick a date and zone. The marker on the core drops to that moment in the strata of computer time: the epoch, Y2K, the 32-bit limit. Every notation of the same instant is written out beside it.
Core sample · 1901 to 2106
Timestamp
Date and zone
The same instant, every way
One number, every date
Unix time counts seconds from 1 January 1970, 00:00 UTC, the Epoch. It has no time zone and no daylight saving; it is the same integer everywhere on Earth at the same instant, which is why databases, logs and APIs store it. Converting it means choosing a zone to read it in. This page reads seconds, milliseconds, microseconds and nanoseconds by their size, prints the instant in ISO 8601, RFC 2822, your zone and any other, and goes the other way when you pick a date.
The strata
The core runs from the signed 32-bit floor at 13 December 1901 to the unsigned 32-bit ceiling in February 2106, oldest at the bottom as any core is read. The Epoch is the boundary layer; Y2K sits above it; the thin red seam at 19 January 2038, 03:14:07 UTC is where a signed 32-bit counter overflows, the bug still buried in old systems. Timestamps outside the core are still converted; the marker just stops at the end.
Seconds or milliseconds?
Auto reads a 10-digit number as seconds, 13 digits as milliseconds, 16 as microseconds and 19 as nanoseconds, which covers every common source. Force a unit if your number is unusual.
Can it convert negative timestamps?
Yes; they are dates before 1970. The marker reads them down to the 1901 floor.
Is anything uploaded?
No. The arithmetic and the zone tables are the browser's own.