jQuery datepicker和验证无法清除错误

Question

我对Jquery“ datapicker”和Jquery“ validation”有问题。我有两个textfeilds具有dropdow datepicker日历，如果在提交时选择了日期，则它们的背景色为“红色”。 如果随后选择了日期，则背景颜色保持“红色”，表示背景未清除。谁能看到原因或向我指出正确的方向。

Jquery代码：

$(document).ready(function() {
  $('#RoomToDate2').change(function() {
    var fromdate  = $('#RoomFromDate2').val();
    var todate    = $('#RoomToDate2').val();
    var newfromdate = fromdate.split("-").reverse().join("-");
    var newtodate = todate.split("-").reverse().join("-");
    if(newtodate < newfromdate){
      $.alert({
        type: 'red',
        title: 'Error: Dates ',
        content: 'The "To" date '+todate+' is less than the "From" date '+fromdate+'.<br/><br/> Adjust your dates.',
        animation: 'zoom',
        boxWidth: '50%',
        closeAnimation: 'zoom',
        buttons: {
         Close: function() {
            text: 'Close'
          }
        }
      })
    }
  });
});

验证码：

$(function() {
$("#form2").validate({
    rules:{
        ClientName: {
            required: true
            },
        RoomFromDate:  {
            required: true
            },
        RoomToDate: {
            required: true
            },
        RoomFromTimeH: {
            required: true
            },
        RoomToTimeH: {
            required: true
            },
        RoomFromTimeM: {
            required: true
            },
        RoomToTimeM: {
            required: true
            },
        ClientContactEmail: {
            required: false
            },  
    },
    messages: {
        ClientName: {
            required: ""
        },
        RoomFromDate: {
            required: ""
        },
        RoomToDate: {
            required: ""
        },
        RoomFromTimeH: {
            required: ""
        },
        RoomToTimeH: {
            required: ""
        },
        RoomFromTimeM: {
            required:  ""
        },
        RoomToTimeM: {
            required:  ""
        },
    },
    // Called when the element is invalid:
highlight: function(element) {
    $(element).css('background', '#ffdddd');
},

// Called when the element is valid:
unhighlight: function(element) {
    $(element).css('background', '#ffffff');
}
});
$("#ClientContactEmail").change(function(){
    $(this).removeData();
});
});

在此先感谢您的帮助和时间。