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Scheduler doesn't control date end. 

You can try to use the following approach to show error message when date is chosen incorrectly:

var setter = scheduler.form_blocks.time.set_value;
scheduler.form_blocks.time.set_value = function(node,value,ev){
    s=node.getElementsByTagName("select");
    for(var i = 0; i < s.length; i ++)
        s[i].onchange = checkTime;
    setter.apply(this,arguments);
}
function checkTime(e){
    var start_date=new Date(s[3].value,s[2].value,s[1].value,0,s[0].value);
    var end_date=new Date(s[7].value,s[6].value,s[5].value,0,s[4].value);
    if(start_date > end_date) alert("The end date isn't correct!");
}