1* SELECT TO_CHAR(TO_DATE('08 Feb 2019','DD MON YYYY') ,'DD.MM.YYYY') FROM dual
SQL> /
SELECT TO_CHAR(TO_DATE('08 Feb 2019','DD MON YYYY') ,'DD.MM.YYYY') FROM dual
                       *
ERROR at line 1:
ORA-01843: not a valid month

SQL> ed
Wrote file afiedt.buf

  1* SELECT TO_CHAR(TO_DATE('08 Feb 2019','DD MON YYYY','NLS_DATE_LANGUAGE=AMERICAN') ,'DD.MM.YYYY') d FROM dual
SQL> /

D
----------
08.02.2019

SQL>