"Aoyai Kouhei" <aoyagi(dot)kouhei(at)gmail(dot)com> writes:
> select '0001-01-01'::timestamp with time zone;
> -> "0001-01-01 00:00:00+09:18:59"
> select '1887-01-01'::timestamp with time zone;
> -> "1887-01-01 00:00:00+09:18:59"
You did not say what timezone setting you are using, but in some of them
this is not wrong.
regards, tom lane