See crontab2english. It is on CPAN, just very well hidden. ;-) From the pod:

  Example output:
  % crontab2english | less
  Setting env var MAILTO to hulahoops@polygon.int
  
  Command: (line 2)
    Run: /bin/csh -c 'perl ~/thang.pl | mail -s hujambo root'
    At: 8:10am on    the 15th of    every month
  
  Command: (line 5)
    Run: df -k
    At: 5:40am    every day
  
  Command: (line 7)
    Run: ls -l /tmp
    At: 6:50am    every Monday
[download]

--
John.