Put in your vimrc file:

set statusline=%<%f%<%{FileTime()}%<%h%m%r%=%-20.(line=%03l,col=%02c%V,totlin=%L%)\%h%m%r%=%-30(,BfNm=%n%Y%)\%P\*%=%{CurTime()}
set rulerformat=%15(%c%V\ %p%%%)
"set rulerformat=%<%f%<%{FileTime()}%<%h%m%r%=%-20.(line=%03l,col=%02c%V,totlin=%L%)\%h%m%r%=%-30(,BfNm=%n%Y%)\%P\*%=%{CurTime()}

function! FileTime()
  let ext=tolower(expand("%:e"))
  let fname=tolower(expand('%<'))
  let filename=fname . '.' . ext
  let msg=""
  let msg=msg." ".strftime("(Modified %b,%d %y %H:%M:%S)",getftime(filename))
  return msg
endfunction

function! CurTime()
  let ftime=""
  let ftime=ftime." ".strftime("%b,%d %y %H:%M:%S")
  return ftime
endfunction

Comments

This gets the file's mtime on each update. Isn't that somewhat of an overkill?