var s: string;
begin
S := FormatDateTime('yyyy年mm月d日', StrtoDate('1992/2/1'));
s := StringReplace(s, '1', '壹', [rfReplaceAll]);
s := StringReplace(s, '2', '貳', [rfReplaceAll]);
...
s := StringReplace(s, '0', '零', [rfReplaceAll]);
Showmessage(s);
end;