import java.text.SimpleDateFormat;
public class millToDate {
public static void main(String[] args) {
int i=1511971200;
Long l=1511971200000L;//强转long 类型
Double d=15119712D;//强转成Double类型
long beginTime = System.currentTimeMillis();//获取当前毫秒数
System.out.println(beginTime);//1513585057457
SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
System.out.println(sdf.format(1511971200000L)) ;//输出结果是:2017-11-30 00:00:00
}
}