通过TimeZone转换日期 [英] Convert Date by TimeZone

问题描述

在上面的代码中，我想将服务器时区（GMT-02：00）的日期从设备（GMT-03：00）转换为TimeZone。
但是我总是拥有相同的服务器日期。我做错了什么？

In that code above I want to transform a Date by the TimeZone of Server (GMT-02:00) to TimeZone from my Device (GMT-03:00). But I Always have the same Date of the server. What I doing wrong?

TimeZone timeZoneServer = TimeZone.getTimeZone（timeZoneServerString）;
长时间=新长（Long.valueOf（timeInMilis））;

TimeZone timeZoneServer = TimeZone.getTimeZone(timeZoneServerString); Long time = new Long(Long.valueOf(timeInMilis));

        Calendar calendarDateServer =   Calendar.getInstance(timeZoneServer);
        calendarDateServer.setTimeInMillis(time);
        long miliServer = calendarDateServer.getTimeInMillis();

        TimeZone timeZoneMeu = TimeZone.getDefault();
        Calendar meuCalendario =  new GregorianCalendar();
        meuCalendario.setTimeZone(timeZoneMeu);

        meuCalendario.setTimeInMillis(miliServer);  
        Date transformedDate = meuCalendario.getTime();


        return transformedDate; 

推荐答案

我做错了什么？

What I doing wrong?

你假设一个 Date 有一个时区开始与。没有一个日历，但是，从Unix纪元开始，一个 Date 是只是毫秒。它不知道日历系统或时区。这只是一个时间点。

You're assuming that a Date has a time zone to start with. It doesn't. A Calendar does, but a Date is just milliseconds since the Unix epoch. It doesn't know about calendar systems or time zones. It's just a point in time.

目前还不清楚你想要做的结果 - 但是如果是格式化显示的问题，只需使用 SimpleDateFormat ，并设置 上的时区。

It's not clear what you want to do with the result - but if it's a matter of formatting it for display, just use SimpleDateFormat and set the time zone on that instead.

我还强烈建议您使用 Joda时间，而不是内置的类型...这是一个更多的更多明智的API。

I would also strongly recommend that you use Joda Time instead of the built-in types... it's a much more sensible API.

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