说明：  修改系统时间, 通过代码实现 对系统时间的修改，（编程法！）希望掌握更多的VFP使用技巧，该网站上传要求过于复杂。
(Modify the system time to realize the system time through code changes, (programming method!) Wished to have more VFP tips, the site upload is too complicated.)