An Oracle DATE stores timestamp information as well, with reduced granularity, while a TIMESTAMP also store timestamps. With the result that if you use DATE Oracle’s own SQL Developer tool assumes, by default, that you don’t want the (less accurate) timestamp and default to only showing the date part.
Compare and contrast with PostgreSQL’s sane types and weep. To paraphrase that saying, friends don’t let friends use Oracle products.
Intuitionistically Uncertain 