The epoch in PHP is either 1970 or 1901 depending on your system.
From the PHP manual:
The valid range of a timestamp is typically from Fri, 13 Dec 1901
20:45:54 GMT to Tue, 19 Jan 2038 03:14:07 GMT. (These are the dates
that correspond to the minimum and maximum values for a 32-bit signed
integer). However, before PHP 5.1.0 this range was limited from
01-01-1970 to 19-01-2038 on some systems (e.g. Windows).
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