This may help you
$("#txtArrivalDate").datepicker({
dateFormat: 'yy-mm-dd',
numberOfMonths: 1,
onSelect: function (selected) {
$("#txtDepartureDate").datepicker("option", "minDate", selected)
}
});
$("#txtDepartureDate").datepicker({
dateFormat: 'yy-mm-dd',
numberOfMonths: 1,
onSelect: function (selected) {
$("#txtArrivalDate").datepicker("option", "maxDate", selected)
}
});