据我所知，这是的无法以这种方式映射它，你必须为切换到一对 - 许多和许多一对一的关系，在中间的B点。你的日期将是B的属性。

From what I know, it is not possible to map it this way, you have to switch to One-To-Many and a Many-To-One relationships, with your B in the middle. Your date will be an attribute of B.

有关这种缺乏evolutivity的，Hibernate文档建议避免许多一对多一般，而且从一开始就使用这两种关系。

For this lack of evolutivity, the Hibernate documentation recommends to avoid the Many-To-Many in general, and use the two relationships from the beginning.