remove last character from date and format to date

Hi,

I have a field (called 'pehPErcontrol') that
contains a date value, plus one character. But the value is formatted like
this:

201301042

I need to remove the last character (last '2' in
the above example) but I also need to format the left over value (20130104) to a
date value:

01/04/2013

How can I do this?

I've tried but can't get it to work:

(datetime,'pehPErcontrol',101)