java 时区 夏令时 java calendar设置时区

import java.util.Calendar;  
import java.util.TimeZone;  
  
public class Test1 {  
  
    public static void main(String[] args) {  
          
        //指定东八区，即北京时间  
        Calendar cc = Calendar.getInstance(TimeZone.getTimeZone("GMT+8"));  
        int year = cc.get(Calendar.YEAR);  
          
        //月份是从0开始计数的，所以此处进行加1  
        int month = cc.get(Calendar.MONTH)+1;  
        int day = cc.get(Calendar.DAY_OF_MONTH);  
          
        int hour_8 = cc.get(Calendar.HOUR);//8小时制  
        int hour_24 = cc.get(Calendar.HOUR_OF_DAY);//24小时制  
          
        int minute = cc.get(Calendar.MINUTE);  
        int second = cc.get(Calendar.SECOND);  
          
        //需减一（西方一周的第一天是周日）  
        int weekday = cc.get(Calendar.DAY_OF_WEEK)-1;  
          
        //8小时制输出  
        System.out.println(year+"-"+month+"-"+day+" "+hour_8+":"+minute+":"+second+" 星期"+weekday);  
          
        //24小时制输出  
        System.out.println(year+"-"+month+"-"+day+" "+hour_24+":"+minute+":"+second+" 星期"+weekday);  
    }  
}

输出结果：

2012-3-16 3:24:24 星期5  
2012-3-16 15:24:24 星期5