日期类型的字段为什么序列化的时候会有个 T（例如 2011-07-14T19:43:37），有什么讲究吗

最简单的解决方案 T 和 Z 用“ ” replace 就完事了

https://stackoverflow.com/questions/29281935/what-exactly-does-the-t-and-z-mean-in-timestamp

> The T doesn't really stand for anything. It is just the separator that the ISO 8601 combined date-time format requires. You can read it as an abbreviation for Time.
The Z stands for the Zero timezone, as it is offset by 0 from the Coordinated Universal Time (UTC).

T 就是个分隔符别搭理他，现在一般也用空格代替。

如果提供接口的话，不要改，遵循 ISO8601 的来。让客户端 toLocaleDateString()去

用 String 或者 Long 类型替代

T 是 time separator，一般来说默认拿到的都是当前时区的时间，转成 UTC 的话会在末尾加上 Z，大部分都属于系统级的 feature，算是通俗规范定义，硬要拿掉也无所谓

It is in the form of yyyyMMddTHHmmssffffZ (case-sensitive, using a 4-digit year, 2-digit month, 2-digit day, the letter "T" as a time separator, 2-digit hour, 2-digit minute, 2-digit second, 4-digit millisecond, and the letter "Z" as the UTC indicator). An example of results when you use this format is 20150302T0840539947Z

推荐使用 Timestamp 时间戳便于传输和运算，仅当需要展示时才转成字符串。