Validate that end date is greater than start date with jQuery

Question

How do I check/validate in jQuery whether end date [textbox] is greater than start date [textbox]?

Answer 1

function endDate(){
    $.validator.addMethod("endDate", function(value, element) {
      var params = '.startDate';
        if($(element).parent().parent().find(params).val()!=''){
           if (!/Invalid|NaN/.test(new Date(value))) {
               return new Date(value) > new Date($(element).parent().parent().find(params).val());
            }
       return isNaN(value) && isNaN($(element).parent().parent().find(params).val()) || (parseFloat(value) > parseFloat($(element).parent().parent().find(params).val())) || value == "";              
      }else{
        return true;
      }
      },jQuery.format('must be greater than start date'));

}

function startDate(){
            $.validator.addMethod("startDate", function(value, element) {
            var params = '.endDate';
            if($(element).parent().parent().parent().find(params).val()!=''){
                 if (!/Invalid|NaN/.test(new Date(value))) {
                  return new Date(value) < new Date($(element).parent().parent().parent().find(params).val());
            }
           return isNaN(value) && isNaN($(element).parent().parent().find(params).val()) || (parseFloat(value) < parseFloat($(element).parent().parent().find(params).val())) || value == "";
                 }
                        else{
                     return true;
}

    }, jQuery.format('must be less than end date'));
}

Hope this will help :)