无法从 TemporalAccessor 获取 OffsetDateTime [英] Unable to obtain OffsetDateTime from TemporalAccessor

问题描述

当我这样做

String datum = "20130419233512";
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyyMMddHHmmss").withZone(ZoneId.of("Europe/Berlin"));
OffsetDateTime datetime = OffsetDateTime.parse(datum, formatter);

我收到以下异常:

    java.time.format.DateTimeParseException: Text '20130419233512' could not be parsed: 
Unable to obtain OffsetDateTime from TemporalAccessor: {InstantSeconds=1366407312},ISO,Europe/Berlin resolved 
to 2013-04-19T23:35:12 of type java.time.format.Parsed

如何解析我的日期时间字符串，以便将其解释为始终来自欧洲/柏林"时区?

How can I parse my datetime string so that it is interpreted as always being from the timezone "Europe/Berlin" ?

推荐答案

问题在于 ZoneId 和 ZoneOffset 之间存在差异.要创建 OffsetDateTime，您需要一个区域偏移量.但是 ZoneId 和 ZoneOffset 之间没有一对一的映射 因为它实际上取决于当前的夏令时.对于相同的ZoneId，如Europe/Berlin"，夏季有一个偏移量，冬季有不同的偏移量.

The problem is that there is a difference between what a ZoneId is and a ZoneOffset is. To create a OffsetDateTime, you need an zone offset. But there is no one-to-one mapping between a ZoneId and a ZoneOffset because it actually depends on the current daylight saving time. For the same ZoneId like "Europe/Berlin", there is one offset for summer and a different offset for winter.

对于这种情况，使用 ZonedDateTime 而不是 OffsetDateTime 会更容易.在解析过程中，ZonedDateTime 将正确设置为 "Europe/Berlin" 区域 ID，偏移量也将根据该日期生效的夏令时设置解析:

For this case, it would be easier to use a ZonedDateTime instead of an OffsetDateTime. During parsing, the ZonedDateTime will correctly be set to the "Europe/Berlin" zone id and the offset will also be set according to the daylight saving time in effect for the date to parse:

public static void main(String[] args) {
    String datum = "20130419233512";
    DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyyMMddHHmmss").withZone(ZoneId.of("Europe/Berlin"));
    ZonedDateTime datetime = ZonedDateTime.parse(datum, formatter);

    System.out.println(datetime.getZone()); // prints "Europe/Berlin"
    System.out.println(datetime.getOffset()); // prints "+02:00" (for this time of year)
}

请注意，如果您真的想要一个 OffsetDateTime，您可以使用 ZonedDateTime.toOffsetDateTime() 将 ZonedDateTime 转换为 OffsetDateTime.

Note that if you really want an OffsetDateTime, you can use ZonedDateTime.toOffsetDateTime() to convert a ZonedDateTime into an OffsetDateTime.

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