After some struggle found the required solution
at Datepicker Link, just click the Download Development and get latest JS which include the orientation options. In the JS given defaults are:
var defaults = $.fn.datepicker.defaults = {
autoclose: true,
beforeShowDay: $.noop,
calendarWeeks: false,
clearBtn: false,
daysOfWeekDisabled: [],
endDate: Infinity,
forceParse: true,
format: 'mm/dd/yyyy',
keyboardNavigation: true,
language: 'en',
minViewMode: 0,
orientation: "auto",
rtl: false,
startDate: -Infinity,
startView: 2,
todayBtn: false,
todayHighlight: false,
weekStart: 0
};
I just use the default :
orientation: "auto",
there are more options available for orientation.