如何使ZoneOffset UTC返回"+00:00"而不是"Z" [英] How to make ZoneOffset UTC return "+00:00" instead of "Z"

问题描述

java中是否有任何内置方法为 ZoneOffset UTC返回"+ 00:00" ? getId()方法仅返回"Z" .

Is there any built-in method in java to return "+00:00" for ZoneOffset UTC? The getId() method only return "Z".

我当前的方法是手动将结果更改为"Z"

My current approach is manual change it to "+00:00" if the result is "Z"

public static String getSystemTimeOffset() {
    String id = ZoneOffset.systemDefault().getRules().getOffset(Instant.now()).getId();
    return "Z".equals(id) ? "+00:00" : id;
}

推荐答案

private static DateTimeFormatter offsetFormatter = DateTimeFormatter.ofPattern("xxx");

public static String getSystemTimeOffset() {
    ZoneOffset offset = ZoneId.systemDefault().getRules().getOffset(Instant.now());
    return offsetFormatter.format(offset);
}

事实证明，可以像日期时间对象一样设置 ZoneOffset 的格式(除非没有 ZoneOffset.format 方法，所以我们需要使用 DateTimeFormatter.format 方法并传递区域偏移).因此，只需阅读 DateTimeFormatter 的文档即可.您可以使用许多格式模式字母来格式化偏移量: O ， X ， x 和 Z .对于每种格式，我们输入多少格式都会有所不同.大写的 X 将为您提供您不需要的 Z ，因此我们可以跳过.这些示例似乎表明我们可以在此处使用小写的 x 或大写的 Z .对于 x :三个字母输出小时和分钟，并带有冒号，例如'+01:30'."宾果游戏.

It turns out that a ZoneOffset can be formatted just like a date-time object can (except there is no ZoneOffset.format method, so we need to use the DateTimeFormatter.format method and pass the zone offset). So it’s a matter of reading the documentation of DateTimeFormatter. There are plenty of format pattern letters that you can use for formatting an offset: O, X, x and Z. And for each it makes a difference how many we put in the format. Uppercase X will give you the Z that you don’t want, so we can skip that. The examples seem to indicate that we can use lowercase x or uppercase Z here. For x: "Three letters outputs the hour and minute, with a colon, such as '+01:30'." Bingo.

链接: DateTimeFormatter 文档

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