Java日期到时区的转换不起作用 [英] Java date conversion to timezone not working

问题描述

在Java中，我从英国下载时间，现在在多伦多，我想获取时区并将转换后的日期对象更改为该时区，但是它不起作用.

In java, I download a time from the UK and I am in toronto, I want to get the timezone and change the converted date object to it, but it's not working.

public static Date getDateFromSQLDate(String sqldate) {
    try {
        DateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss", Locale.getDefault());
        Date date = (Date) formatter.parse(sqldate);

        TimeZone tz = TimeZone.getDefault();
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        calendar.setTimeZone(tz);
        return calendar.getTime();

        //return date;
    } catch (ParseException e) {
        e.printStackTrace();
    }
    return null;
}

有人知道怎么了吗?

谢谢

推荐答案

DateFormat使用系统的默认时区，最可能是多伦多.您需要做的是:

DateFormat uses the system's default timezone, which most likely to be Toronto. What you need to do is:

 DateFormat formatter = ...
 formatter.setTimeZone(TimeZone.getTimeZone("Europe/London"));
 Date date = (Date) formatter.parse(sqldate);
 return date;

或适用于您的英国"时间的时区标识符.您可以在此处查看受支持的标识符名称列表: http://en.wikipedia.org/wiki/List_of_tz_database_time_zones

Or whichever time zone identifier applicable to your "UK" time. You can see the list of supported identifier names here: http://en.wikipedia.org/wiki/List_of_tz_database_time_zones

请记住，Date对象(或java.sql.Date)中从未存储任何时区信息.说您要转换Date对象的时区只是没有任何意义，因为您不能这样做.

Keep in mind that the Date object (or java.sql.Date) never has any timezone information stored in it. Saying you want to convert a timezone of a Date object just doesn't make any sense because you can't.

您可以做的是设置解析时区，或设置Date对象的格式.

What you can do is to set the timezone from which you parse, or format the Date object.

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