以上代码设置不了系统时间的原因：因为date并非是一个实际进程..所以Process没办法返回。。

如果真要那种设的话。你需要建一个文件。。用文件来设时间。。因为文件是一个真正的进程-The above code can not set system time reasons: because the date is not a practical process .. there is no way to return Process. . If you really want to set up the kind of words. You need to build a document. . Documents to set up time. . Because the document is a true process of