按日期字符串查询Firebase

您已将日期存储为字符串。当Firebase订单字符串使用词典排序。按照该顺序，2012-20-03出现在2012-25-01之前。

这就是为什么您链接到的问题（以及Firebase文档）通常将日期存储为时间戳。那些拥有关于日期的所有信息，保证以正确的顺序排列。

或者，您可以将日期存储为字符串。但在这种情况下，您必须确保日期格式按照字典顺序排列。对于你的示例：2012-01-25和2012-03-20。

所以在这种情况下，唯一的选择是将数据结构更改为原始问题（和文档）或者按照您的顺序排序的字符串格式想要。

I know that it's possible to query by timestamp as seen in previous question, However, what if the date is in the following format:

How would I go about and query this by date?

You've stored your dates as strings. When Firebase order strings it uses lexicographic ordering. In that order, "2012-20-03" comes before "2012-25-01".

This is the reason why the question you linked to (and the Firebase documentation) usually store dates as timestamps. Those have all the information about the date, in a single number that is guaranteed to be ordered correctly.

Alternatively, you can store the date as a string. But in that case you have to make sure the date is in a format that will lexicographically order correctly too. For your sample that would be: "2012-01-25" and "2012-03-20".

So in this case your only option is to change the data structure to either what was in the original question (and documentation) or to a string format that orders in the order you want.