JAVA Criteria API我需要获取从特定日期经过的时间

import javax.persistence.EntityManager;
import javax.persistence.criteria.CriteriaBuilder;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.Predicate;
import javax.persistence.criteria.Root;
import java.util.Date;

public class Example {
    public static void main(String[] args) {
        EntityManager entityManager = // 获取EntityManager对象
        
        CriteriaBuilder criteriaBuilder = entityManager.getCriteriaBuilder();
        CriteriaQuery<Entity> criteriaQuery = criteriaBuilder.createQuery(Entity.class);
        Root<Entity> root = criteriaQuery.from(Entity.class);
        
        Date specificDate = // 指定的日期
        
        Predicate predicate = criteriaBuilder.greaterThanOrEqualTo(root.get("dateField"), specificDate);
        criteriaQuery.where(predicate);
        
        List<Entity> results = entityManager.createQuery(criteriaQuery).getResultList();
        
        // 处理查询结果
    }
}