//this is a global variable to have only one instance of the calendar
var calendar = null;

//@element => is the where the calender will be rendered by Scal.
//@input => is the where the date will be updated.
//@container => is the for dragging.
//@source => is the img/button which raises up the calender, the script will locate the calendar over this control.
function showCalendar(element, input, container, source)
{
...
...
var date = new Date($F(input));
calendar.setCurrentDate(isNaN(date) ? new Date() : date);
...
};

The conversion of the input to date is not correct.
Please take into account the format fo the input and convert to date. Otherwise, the floating date can display only the current date

GMSK