文档里有例子
QDateTime QFileInfo::created () const
Returns the date and time when the file was created.
On most Unix systems, this function returns the time of the last status change. A status change occurs when the file is created, but it also occurs whenever the user writes or sets inode information (for example, changing the file permissions).
If neither creation time nor "last status change" time are not available, returns the same as lastModified().
See also lastModified() and lastRead().
