Any chance of the date format in Sonar's Help|About screen can reflect the user's locale.  On my Sonar the "valid through" date reads 6/7/2015.  Down under that reads as 6th July 2015.  Of course, I know this is actually 7th June 2015 is the date format is US format.

Another way to show this, without checking the user's locale, is to display the month using the actual word so that , in my example, it reads "valid through 7 June 2015"