Uses system calls to set the times on a file or directory.
Sys.setFileTime(path, time)A character vector containing file or directory paths.
A date-time of class "POSIXct" or an object which can be
coerced to one. Fractions of a second may be ignored. Recycled along
paths.
A logical vector indicating if the operation succeeded for each of the files and directories attempted, returned invisibly.
This attempts sets the file time to the value specified.
On a Unix-alike it uses the system call utimensat if that is
available, otherwise utimes or utime. On a POSIX file
system it sets both the last-access and modification times.
Fractional seconds will set as from R 3.4.0 on OSes with the
requisite system calls and suitable filesystems.
On Windows it uses the system call SetFileTime to set the
‘last write time’. Some Windows file systems only record the
time at a resolution of two seconds.
Sys.setFileTime has been vectorized in R 3.6.0. Earlier versions
of R required path and time to be vectors of length one.