The date format you're using dd-mm-yy
equates to 22-02-2014 not 22-02-14 in jQuery. You could either change the declaration of the array to:
var array = ["22-02-2014"];
or change the format used in formatDate to:
var string = jQuery.datepicker.formatDate('dd-mm-y', date);
I'd suggest the first option as the second option would not allow 22-02-1914 to be selected.
A JSFiddle can be found here