UTIME(2) System Calls Manual UTIME(2)
utime - set file times
The utime call uses the `accessed' and `updated' times in that order
from the timep vector to set the corresponding recorded times for file.
The caller must be the owner of the file or the super-user. The
`inode-changed' time of the file is set to the current time.
(utime = 30.)
sys utime; file; timep