I created a jsfiddle for you.
I’m not a 100% sure if it’s “foolproof” but to prevent users from manually typing a date you could set the inputs to readonly
e.g.
<input type="text" id="dt1" readonly="readonly">
At the moment I check the dt2 onClose and if its date is below dt1s date I correct it.
Also if a date is selected in dt1 the minDate of dt2 is set to dt1 date +1.
$(document).ready(function () {
$("#dt1").datepicker({
dateFormat: "dd-M-yy",
minDate: 0,
onSelect: function (date) {
var date2 = $('#dt1').datepicker('getDate');
date2.setDate(date2.getDate() + 1);
$('#dt2').datepicker('setDate', date2);
//sets minDate to dt1 date + 1
$('#dt2').datepicker('option', 'minDate', date2);
}
});
$('#dt2').datepicker({
dateFormat: "dd-M-yy",
onClose: function () {
var dt1 = $('#dt1').datepicker('getDate');
var dt2 = $('#dt2').datepicker('getDate');
//check to prevent a user from entering a date below date of dt1
if (dt2 <= dt1) {
var minDate = $('#dt2').datepicker('option', 'minDate');
$('#dt2').datepicker('setDate', minDate);
}
}
});
});
See the jsfiddle