You could also just "roll your own" with a few lines of code. Make a hash where the three-letter abbreviation for each month is the key, and the value is its numerical equivalent. Then...

 print "$months{$2}/$1/2015" 
 if $ugly_date =~   
 /([0-3]?[[0-9]) (Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec) .*/

# Returns 8/19/2015>
[download]

Though you'd probably want to set a $current_year variable with a call to your system