ctim

(typename $filestat
  (record
    ;;; Device ID of device containing the file.
    (field $dev $device)
    ;;; File serial number.
    (field $ino $inode)
    ;;; File type.
    (field $filetype $filetype)
    ;;; Number of hard links to the file.
    (field $nlink $linkcount)
    ;;; For regular files, the file size in bytes. For symbolic links, the length in bytes of the pathname contained in the symbolic link.
    (field $size $filesize)
    ;;; Last data access timestamp.
    ;;; This can be 0 if the underlying platform doesn't provide suitable
    ;;; timestamp for this file.
    (field $atim $timestamp)
    ;;; Last data modification timestamp.
    ;;; This can be 0 if the underlying platform doesn't provide suitable
    ;;; timestamp for this file.
    (field $mtim $timestamp)
    ;;; Last file status change timestamp.
    ;;; This can be 0 if the underlying platform doesn't provide suitable
    ;;; timestamp for this file.
    (field $ctim $timestamp)
  )
)