Submitted by: @krilbe

Is related to QA479

FB 2.1 using isql, connect with utf8 to a database with default charset
utf8. Then try this (commits excluded for brevity):

create table "Temp" ("Dummy" int);
insert into "Temp" ("Dummy") values (1);
select * from "Temp";
alter table "Temp" add "New" timestamp default '0001-01-01' not null;
select * from "Temp";

This will result in an error (actual transcript):
----------------------------------------------------------
SQL> select * from "Temp";

Dummy New
============ =========================
Statement failed, SQLCODE = -413
conversion error from string "00"
----------------------------------------------------------

If I try it without specifying a connection charset there's no error and
the expected default is returned upon select.

I tried also with e.g. '1901-01-01' and then it complains about "19"
instead, so it appears to be (at least) the century that causes problems.

A workaround:
update "Temp" set "New" = '0001-01-01';
After that it seems to work.