Question

我想将UTC时间存储在数据库（yyyy-mm-dd或dd-mm-yyyy）

中

我想将本地时区转换为UTC并将其存储在DB

我尝试了不同的方法，但这种方式不正常。以下是我将本地转换为UTC的代码

从DB获取UTC时间并转换为本地时区

以下是我的代码：

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.TimeZone;

public class TestDate {

    public static void main(String[] args) {                
        /*Date de = new Date();
        DateFormat converter1 = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss");
        System.err.println(converter1.format(de));
        Date der =*/
                localToGMT();
//          System.err.println("0000 : "+converter1.format(der));
        Date d=  new Date("09/10/2017 21:53:17");
        gmttoLocalDate(d);
    }

    public static Date localToGMT() {
//      Date gmt = new Date(sdf.format(date));
        Date gmt = null;
        Date localTime =  new Date();
         //creating DateFormat for converting time from local timezone to GMT
         DateFormat converter = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss");

         //getting GMT timezone, you can get any timezone e.g. UTC
         converter.setTimeZone(TimeZone.getTimeZone("GMT"));
         System.out.println("local time : " + localTime);;
         System.out.println("time in GMT : " + converter.format(localTime));

         try {
            gmt =converter.parse((converter.format(localTime)));
        } catch (ParseException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
         /*Date date = new Date("2017/10/10 12:04:28");
         System.err.println(date);
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
            sdf.setTimeZone(TimeZone.getTimeZone("UTC"));
        gmt = sdf.parse(sdf.format(date));*/
        System.err.println("converted to utc :" + gmt);
        return gmt;
    }

    public static Date gmttoLocalDate(Date date) {
        String timeZone = Calendar.getInstance().getTimeZone().getID();
        Date local = new Date(date.getTime() + TimeZone.getTimeZone(timeZone).getOffset(date.getTime()));
        System.err.println("converted to local timezone :" + local);
        return local;
    }
}

Answer 1

本地到UTC

 public static Date localToUTC() {
    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;
    }

UTC到本地

public static Date utctoLocalDate(Date date) {

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

}

如何将本地时区转换为utc和utc本地时区？

1 个答案: