您无法在Firebase Realtime数据库中添加类型LocalDate的属性，因为它不是 href ="https://firebase.google.com/docs/database/android/read-and-write" rel ="nofollow noreferrer">支持的数据类型.但是，有两种方法可以解决此问题:

There is no way you can add a property of type LocalDate in a Firebase Realtime database because it is not a supported data-type. However, there are two ways in which you can solve this:

1. 将日期另存为ServerValue.TIMESTAMP，这基本上意味着您保存了自Unix时代以来经过的秒数.在这种情况下，服务器将当前日期写入数据库中.要实现这一点，请从以下帖子中查看我的答案:

1. You save the date as a ServerValue.TIMESTAMP, which basically means that you save the number of seconds that have elapsed since the Unix epoch. In this case, the server writes the current date in the database. To achieve this, please see my answer from the following post:

• 您为日期字段指定一个自定义的long值.在这种情况下，由您决定要写什么日期.

  You specify a custom long value for your date field. In this case, it's up to you to determine what date is written.

  不幸的是，您无法将这两个选项结合使用，只能使用其中一个.

  Unfortunately, there is no way you can combine these two options, you can use one or the other.

  在谈论LocalDate时，我们通常谈论的是偏移量，在这种情况下，这就是我要做的.如第一点所述，我将存储一个Timestamp属性，该属性将使服务器使用服务器Timestamp填充，以及一个offset属性，该属性应使用以天/小时为单位的偏移量填充.

  When talking about a LocalDate, we usually talk about an offset, in which case, this what I'll do. I'll store a Timestamp property, as explained at point one, that will let the server populate with the server Timestamp, as well as an offset property, that should be populated with the offset in days/hours.