java 时区处理机制（0时区转换到服务器时区）

package com.globalroam.util;

import java.util.Calendar;
import java.util.Date;
import java.util.TimeZone;


public class TestForPrictice {
    public static void main(String[] args) {
        Calendar cal = Calendar.getInstance();
        TimeZone timeZoneOld = cal.getTimeZone();
    
        
        Date date = new Date(1359641834000L);
        System.out.println(date);
        date = changeTimeZone(date, TimeZone.getTimeZone(timeZoneOld.getDisplayName()), TimeZone.getTimeZone("GMT"));
    }
    
    public static Date changeTimeZone(Date date, TimeZone oldZone, TimeZone newZone) {
        Date dateTmp = null;
        if (date != null) {
            int timeOffset = oldZone.getRawOffset() - newZone.getRawOffset();
            System.out.println("oldZone.getRawOffset()====>" + oldZone.getRawOffset());
            System.out.println("newZone.getRawOffset()====>" + newZone.getRawOffset());
            dateTmp = new Date(date.getTime() - timeOffset);
        }
        return dateTmp;
    }
}

 js: js 获取客户端时区
new Date().getTimezoneOffset();