title: How to modify file's date programmaticaly?
body: <p>I have some image files with the wrong date (date of file creation, the value that is shown by <code>ls -l</code>), because it was set wrong in the camera. How can I increment the date by two days in a script changing all *.jpg files in a directory? Bash, Perl, what ever runs on a Linux machine and is appropriate for the job would be fine.</p>
  
  <p>Searching the web I found that <code>touch</code> is used to manipulate date, but I did not found a way incrementing it by two days, while preserving the time.</p>
  
  <p>Thank you.</p>