调用System.currentTimeMillis()显示当前时间

package Hello;
import java.text.SimpleDateFormat;
import java.util.Date;
public class Hello {
    public static void main(String[] args){
        Date nowTime = new Date(System.currentTimeMillis());
        SimpleDateFormat sdFormatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:dd");
        String retStrFormatNowDate = sdFormatter.format(nowTime);
        System.out.println("当前时间："+ retStrFormatNowDate + " GMT");
    }
}