Datepicker doesn't have this functionality anymore, but there are loads of plugins and extensions that does.
http://dubrox.blogspot.se/2010/09/multiple-dates-picker-for-jquery-ui.html
http://keith-wood.name/datepick.html#range
http://multidatespickr.sourceforge.net/
https://github.com/dangrossman/bootstrap-daterangepicker/
A quick Google search will reveal even more.