将本地时间转换为UTC，反之亦然 [英] Convert Local time to UTC and vice versa

问题描述

我正在研究Android应用程序，我希望将本地时间（设备时间）转换为UTC并将其保存在数据库中。从数据库中检索后，我必须再次转换它并显示在设备的时区。任何人都可以建议如何在Java中这样做吗？

I'm working on Android application, and I want to convert local time (device time) into UTC and save it in database. After retrieving it from database I have to convert it again and display in the device's time zone. Can anyone suggest how to do this in Java?

推荐答案

我使用这两种方法将本地时间转换为GMT / UTC，反之亦然这对我没有任何问题，工作正常。

I converted local time to GMT/UTC and vice versa using these two methods and this works fine without any problem for me.

public static Date localToGMT() {
    Date date = new Date();
    SimpleDateFormat sdf = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
    sdf.setTimeZone(TimeZone.getTimeZone("UTC"));
    Date gmt = new Date(sdf.format(date));
    return gmt;
}

将要转换为设备当地时间的GMT / UTC日期传递给此方法：

pass the GMT/UTC date which you want to convert into device local time to this method:

public static Date gmttoLocalDate(Date date) {

    String timeZone = Calendar.getInstance().getTimeZone().getID();
    Date local = new Date(date.getTime() + TimeZone.getTimeZone(timeZone).getOffset(date.getTime()));
    return local
}

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