Attempts to set the access and modification time of the
file named by filename to the value given by time. If the
option time is not given,
uses the present time. This is equivalent to what utime
(sometimes referred to as utimes) does. If the third option
atime is present, the
access time of the given filename is set to the value of atime. Note that the access
time is always modified, regardless of the number of
parameters.
If the file does not exist, it is created.
成功回傳TRUE失敗回傳FALSE。