jQuery UI日期选择器克隆年份重叠如何计算

使用当前的代码，我可以进行一年的经验计算，如何检查重叠的日期。例如，如果用户从原始div 19/5/2005-18/6/2015中选择一次，如果用户选择19/3/2003-18/6/2016，则用户单击克隆的div中的添加更多按钮。它应该说一个警告消息。

这是jQuery代码

/* select exp date ends here*/
/* dates starts here*/

/*addmore functionalities starts here*/
   /*dynamic row for Education Table starts here*/
    var count=0;
    $(document).on("click", ".edu_add_button", function () {            
        var $clone = $('.cloned-row1:eq(0)').clone(true,true);
        //alert("Clone number" + clone);
        $clone.find('[id]').each(function(){this.id+='someotherpart'});
        $clone.find('.btn_more').after("<input type='button' class='btn_less1 edu_btnle' id='buttonless'/>")
        $clone.attr('id', "added"+(++count));
        $clone.find(".school_Name").attr('disabled', true).val('');
        $clone.find(".degree_Description").attr('disabled', true).val('');
        $clone.find("input.deg_date")
          .removeClass('hasDatepicker')
          .removeData('datepicker')
          .unbind()
          .datepicker({
            dateFormat: "mm-dd-yy",
            changeMonth: true,
            yearRange: "-100:+0",
            changeYear: true,
            maxDate: new Date(),
            showButtonPanel: false,
            beforeShow: function () {
                setTimeout(function (){
                $('.ui-datepicker').css('z-index', 99999999999999);

                }, 0);
            }
        });
        $clone.find("input.trans_date")
          .removeClass('hasDatepicker')
          .removeData('datepicker')
          .unbind()
          .datepicker({
            dateFormat: "mm-dd-yy",
            changeMonth: true,
            yearRange: "-100:+0",
            changeYear: true,
            maxDate: new Date(),
            showButtonPanel: false,
            beforeShow: function () {
                setTimeout(function (){
                $('.ui-datepicker').css('z-index', 99999999999999);

                }, 0);
            }
        });
        $(this).parents('.educat_info').after($clone);
    });
    $(document).on('click', ".btn_less1", function (){
        var len = $('.cloned-row1').length;
        if(len>1){
            $(this).closest(".btn_less1").parent().parent().parent().remove();
        }
    });
    /*dynamic row for Education Table ends here*/
    /*dynamic row for Test Score Table starts here*/
    var count=0;
    $(document).on("click", ".test_add_button", function () {           
        var $clone = $('.cloned-row2:eq(0)').clone(true,true);
        $clone.find('[id]').each(function(){this.id+='someotherpart'});
        $clone.find('.btn_more').after("<input type='button' class='btn_less1 selbtnless' id='buttonless'/>")
        $clone.attr('id', "added"+(++count));
        /*$clone.find(".school_Name").attr('disabled', true).val('');
        $clone.find(".degree_Description").attr('disabled', true).val('');*/
        $clone.find("input.txt_date")
          .removeClass('hasDatepicker')
          .removeData('datepicker')
          .unbind()
          .datepicker({
            dateFormat: "mm-dd-yy",
            changeMonth: true,
            yearRange: "-100:+0",
            changeYear: true,
            maxDate: new Date(),
            showButtonPanel: false,
            beforeShow: function () {
                setTimeout(function (){
                $('.ui-datepicker').css('z-index', 99999999999999);

                }, 0);
            }
        });
        $(this).parents('.sel_text').after($clone);
    });
    $(document).on('click', ".btn_less1", function (){
        var len = $('.cloned-row2').length;
        if(len>1){
            $(this).closest(".btn_less1").parent().parent().parent().remove();
        }
    });
    /*dynamic row for Test Score Table ends here*/
    /*dynamic row for Work Experience Table starts here*/
    var count=0;
    $(document).on("click", ".exp_add_button", function () {                
        var $clone = $('.cloned-row3:eq(0)').clone(true,true);
        $clone.find('[id]').each(function(){this.id+='someotherpart'});
        $clone.find('.btn_more').after("<input type='button' class='btn_less1 selbtnless' id='buttonless'/>")
        $clone.attr('id', "added"+(++count));
        $clone.find(".startDate").val('');
        $clone.find(".endDate").val('');
        /*$clone.find(".degree_Description").attr('disabled', true).val('');*/
        $clone.find("input.startDate")
          .removeClass('hasDatepicker')
          .removeData('datepicker')
          .unbind()
          .datepicker({
            dateFormat: "mm-dd-yy",
            changeMonth: true,
            yearRange: "-100:+0",
            changeYear: true,
            maxDate: new Date(),
            showButtonPanel: false,
            beforeShow: function () {
                setTimeout(function (){
                $('.ui-datepicker').css('z-index', 99999999999999);

                }, 0);
            }
        });
        $clone.find("input.endDate")
          .removeClass('hasDatepicker')
          .removeData('datepicker')
          .unbind()
          .datepicker({
            dateFormat: "mm-dd-yy",
            changeMonth: true,
            yearRange: "-100:+0",
            changeYear: true,
            maxDate: new Date(),
            showButtonPanel: false,
            beforeShow: function () {
                setTimeout(function (){
                $('.ui-datepicker').css('z-index', 99999999999999);

                }, 0);
            }
        });
        $(this).parents('.wrk_exp').after($clone);
    });

这是小提琴链接

请给我建议。

谢谢与问候马哈德万