JPA CriteriaQuery compare Timestamp ignore time portion

Let say I have a column in Oracle DB like this:

SOMETHING_TS TIMESTAMP WITH TIME ZONE

And I would like to use CriteriaQuery to filter by this column.

I can used native query to achieve this:

    SELECT * 
    FROM SOMETHING
    WHERE TRUNC(SOMETHING_TS) = TO_DATE('2016-12-08','YYYY-MM-DD');

But in Java I have failed to do so, below is my sample code:

    CriteriaBuilder cb = em.getCriteriaBuilder();
    CriteriaQuery<MyClass> cq = cb.createQuery(MyClass.class);
    Date date = new Date();

    predicates.add(cb.equal(cb.function("TRUNC", Date.class, myClass.get("somethingTs")), cb.function("TO_DATE", Date.class, cb.parameter(Date.class, "somethingTs"), cb.literal("YYYY-MM-DD"))));

    Predicate[] predArray = new Predicate[predicates.size()];
    predicates.toArray(predArray);

    cq.where(predArray);

    TypedQuery<MyClass> query = em.createQuery(cq);
    query.setParameter("somethingDt", date);

Seems like I have found my answer:

predicates.add(cb.equal(cb.function("TRUNC", Date.class, myClass.get("somethingTs")), cb.function("TO_DATE", String.class, cb.parameter(String.class, "somethingTs"), cb.literal("YYYY-MM-DD"))));

Then when I set parameter, I will set the String format of date to query.

Thanks!