Java ISO 8601 毫秒和改造
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ISO 8601 with milliseconds and Retrofit
提问by Javier Manzano
I cannot set properly the date format when using retrofit and trying to read a date like this:
使用改造并尝试读取这样的日期时，我无法正确设置日期格式：
2015-08-29T11:22:09.815479Z
An the GSONconverter I'm setting is like this:
我正在设置的GSON转换器是这样的：
GsonConverter gsonConverter = new GsonConverter(
new GsonBuilder()
.setDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSSSSz")
.create()
);
Any clues on what's the problem?
有关问题出在哪里的任何线索？
回答by grim
Java Datehas millisecond precision so I've been creating the Gsonobject like so:
Java Date具有毫秒精度，所以我一直在Gson像这样创建对象：
Gson gson = new GsonBuilder()
.setDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'")
.create();
Of course, in a case like this, the microseconds are being truncated whether you put SSSor SSSSSS. It is also assumed that the last character of the converted string is always a Z.
当然，在这种情况下，无论是 putSSS还是SSSSSS. 还假设转换后的字符串的最后一个字符总是 a Z。
To explain why your pattern didn't work, you used z(lowercase z) which according to the documentation represents a General Timezone(e.g., Pacific Standard Time; PST; GMT-08:00). Additionally, if you were to use Z(uppercase Z), it would also not work since it represents an RFC 822 time zone(e.g., -0800).
为了解释为什么您的模式不起作用，您使用了z(lowercase z) 根据文档表示通用时区（例如，Pacific Standard Time; PST; GMT-08:00）。此外，如果您要使用Z（大写 Z），它也将不起作用，因为它代表RFC 822 时区（例如，-0800）。
In another scenario where instead of the Zyou have a time zone offset (e.g., -08, -0800, or -08:00), you can use X, XX, or XXXto represent an ISO 8610 time zone. But that requires Java 7 or 8 (I don't think Android is compatible with Java 8 at the moment).
在另一种情况下，您可以使用、、 或来表示ISO 8610 时区，而不是Z具有时区偏移量（例如-08、-0800、 或-08:00）。但这需要 Java 7 或 8（我认为 Android 目前与 Java 8 不兼容）。XXXXXX
Another method would be to write your own GsonSerializer and Deserializer; although I haven't tried.
另一种方法是编写自己的GsonSerializer 和 Deserializer；虽然我没试过。
It's also worth looking at java.sql.Timestampclass which is also supported by Gsonand has more fine grained precision (nanoseconds) but it's also an option I haven't explored.
还值得一看java.sql.Timestamp类，它也受支持Gson并具有更细粒度的精度（纳秒），但它也是我尚未探索的选项。
