On a 32-bit machine, the valid range of epoch is: 0 - 2 ** 31 - 1 inclusive, and they translate into:

1970 January 01 00:00:00
2038 January 19 03:14:07
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Here is the code:

use POSIX;

{
    my $t = strftime("%Y %B %d %H:%M:%S", gmtime(0));
    print $t, "\n";
}

{
    my $t = strftime("%Y %B %d %H:%M:%S", gmtime(2 ** 31 - 1));
    print $t, "\n";
}
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