sql - Oracle Timestamp before 1970 - seconds value incorrect -


the following sql run on oracle 11g returns incorrect 'seconds' value dates before 1970-01-01 when fractional seconds present.

is there wrong sql? 

alter session set nls_timestamp_format='ss';  select        to_timestamp('1969-12-31 23:59:59 0','yyyy-mm-dd hh24:mi:ss ff') ts1,        to_timestamp('1969-12-31 23:59:59 1','yyyy-mm-dd hh24:mi:ss ff') ts2,        to_timestamp('1970-01-01 00:00:00 1','yyyy-mm-dd hh24:mi:ss ff') ts3 dual;  ts1  ts2  ts3 59   58   00


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