将GMT中的XMLGregorianCalendar转换为LocalDateTime太平洋时间

问题描述

我正在尝试将以GMT/UTC格式发送的XMLGregorianCalendar转换为America/Los_Angeles时区中的Java 8 LocalDateTime，但运气不好.

I'm trying to convert XMLGregorianCalendar which is sent in GMT/UTC format to Java 8 LocalDateTime in America/Los_Angeles timezone with no luck.

这是我尝试过的方法，无法将时间转换为太平洋时间.

Here is what I tried and couldn't get the time converted to Pacific time.

//xmlDate is 2017-11-13T00:00:00Z
ZonedDateTime zDateTime = xmlDate.toGregorianCalendar().toZonedDateTime().toLocalDateTime().atZone(ZoneId.of("America/Los_Angeles"));
LocalDateTime localDateTime = zDateTime.toLocalDateTime();
//Expected localDateTime is 2017-11-12T16:00. But I only get 2017-11-13T00:00

我想念什么?

推荐答案

atZone()并没有执行您认为的操作.它仅将时区附加到日期，而没有保留时间点.您必须使用ZonedDateTime#withZoneSameInstant()进行操作，该命令可以保持即时并修改区域:

atZone() does not do what you think it does. It merely attaches a timezone to a date without preserving the instant in time. You must do it using ZonedDateTime#withZoneSameInstant(), which keeps the instant and modifies the zone:

public static void main(String[] args) throws Exception {
    XMLGregorianCalendar xc = DatatypeFactory.newInstance().newXMLGregorianCalendar(2017, 10, 13, 0, 0, 0, 0, 0);
    System.out.println(xc);
    GregorianCalendar gc = xc.toGregorianCalendar();
    System.out.println(gc);
    ZonedDateTime zdt = gc.toZonedDateTime();
    System.out.println(zdt);
    LocalDateTime ldt = zdt.withZoneSameInstant(ZoneId.of("America/Los_Angeles")).toLocalDateTime();
    System.out.println(ldt);
}

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