Java8 java.util.Date转换为java.time.ZonedDateTime

问题描述

在尝试将 java.util.Date 转换为 java.time.LocalDate 时，我收到以下异常。

I am getting the following exception while trying to convert java.util.Date to java.time.LocalDate.

java.time.DateTimeException: Unable to obtain ZonedDateTime from TemporalAccessor: 2014-08-19T05:28:16.768Z of type java.time.Instant

代码如下：

public static Date getNearestQuarterStartDate(Date calculateFromDate){

    int[] quaterStartMonths={1,4,7,10};
    Date startDate=null;

    ZonedDateTime d=ZonedDateTime.from(calculateFromDate.toInstant());
    int frmDateMonth=d.getMonth().getValue();

我正在使用 ZonedDateTime class？

Is there something wrong in the way I am using the ZonedDateTime class?

根据文档，应将 java.util.Date 对象转换为 ZonedDateTime 。上述日期格式是标准日期？

As per documentation, this should convert a java.util.Date object to ZonedDateTime. The date format above is standard Date?

我必须在Joda时间回落吗？

Do I have to fallback on Joda time?

如果有人可以提供一些建议，那将是很棒的

If someone could provide some suggestion, it would be great.

推荐答案

将 Instant 转换为 ZonedDateTime ， ZonedDateTime 提供方法。所以

To transform an Instant to a ZonedDateTime, ZonedDateTime offers the method ZonedDateTime.ofInstant(Instant, ZoneId). So

所以，假设你想要在默认的时区内一个 ZonedDateTime ，你的代码应该是

So, assuming you want a ZonedDateTime in the default timezone, your code should be

ZonedDateTime d = ZonedDateTime.ofInstant(calculateFromDate.toInstant(),
                                          ZoneId.systemDefault());

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