问题描述
我试图确保在ZonedDateTime对象上调用toString()符合ISO-8601格式.
I am trying to ensure that calling toString() on my ZonedDateTime Object will comply with ISO-8601 format.
toString()方法的文档指出:
这是否意味着存在呼叫的情况zdt.getOffset()将返回与zdt.getZone().getRules().getOffset(zdt.toInstant())?
Does this mean that there exists a situation where callingzdt.getOffset()will return something different thanzdt.getZone().getRules().getOffset(zdt.toInstant())?
这似乎没有道理.
有人可以提供一个示例，说明其中的偏移量和ID不相同(即:toString()不符合ISO-8601的情况)，以便我可以更好地理解文档中的描述.
Can someone provide an example in which the offset and ID are not the same (ie: where toString() does not comply with ISO-8601) so that I can better understand the description in the documentation.
推荐答案
这是完整的规范:
* Outputs this date-time as a {@code String}, such as
* {@code 2007-12-03T10:15:30+01:00[Europe/Paris]}.
* <p>
* The format consists of the {@code LocalDateTime} followed by the {@code ZoneOffset}.
* If the {@code ZoneId} is not the same as the offset, then the ID is output.
* The output is compatible with ISO-8601 if the offset and ID are the same.
Javadoc规范是指使用ZoneOffset而不是用命名的ZoneId构造ZonedDateTime的情况，因此，偏移量和ID相同:
The Javadoc specification refers to the case where the ZonedDateTime is constructed with a ZoneOffset rather than a named ZoneId, thus where the offset and ID are the same:
System.out.println(ZonedDateTime.now(ZoneId.of("Europe/Paris")));
// 2017-04-26T15:13:12.006+02:00[Europe/Paris]
System.out.println(ZonedDateTime.now(ZoneOffset.ofHours(2)));
// 2017-04-26T15:13:12.016+02:00
可以看出，在第二种情况下，使用ZoneOffset时，toString()格式在末尾省略了方括号部分.省略该部分，结果是与ISO-8601兼容.
As can be seen, in the second case, where a ZoneOffset is used, the toString() format omits the square bracket section at the end. By omitting that section, the result is ISO-8601 compatible.
boolean iso8601Compatible = zdt.getZone() instanceof ZoneOffset;
要确保ISO-8601兼容的输出，请使用toOffsetDateTime():
To guarantee an ISO-8601 compatible output use toOffsetDateTime():
String isoCompatible = zdt.toOffsetDateTime().toString();
或格式化程序.
这篇关于ZonedDateTime toString与ISO 8601的兼容性的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！