Ocigledno oracle ne koristi tu sintaksu za "date" koju si pokusao:
Citat:
Whenever Oracle expects a DATE value, it will automatically convert your input string using TO_DATE according to the default DATE format "DD-MON-YY". For example, to insert a tuple with a DATE attribute, you can simply type:
insert into x values(99, '31-may-98');
Vise o tome
http://infolab.stanford.edu/~ullman/fcdb/oracle/or-time.html
Sve ovo pronasao jednostavnim upitom na google-u ("oracle date format")