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HTML 

              
                <div class="row" id="EventDate">
    <label for="Date">Event date <em class="asterisk"><span>*</span></em></label>
    <div class="selectmenu xsmall-type1 inputDOB">
        <select id="Date" name="EventDateDay" aria-required="true" class="js-selectmenu" data-val-required="Please tell us your event date" data-val="true">
          <option value="">DD</option>
          <option value="01">01</option>
          <option value="02">02</option>
          <option value="03">03</option>
          <option value="04">04</option>
          <option value="05">05</option>
          <option value="06">06</option>
          <option value="07">07</option>
          <option value="08">08</option>
          <option value="09">09</option>
          <option value="10">10</option>
          <option value="11">11</option>
          <option value="12">12</option>
          <option value="13">13</option>
          <option value="14">14</option>
          <option value="15">15</option>
          <option value="16">16</option>
          <option value="17">17</option>
          <option value="18">18</option>
          <option value="19">19</option>
          <option value="20">20</option>
          <option value="21">21</option>
          <option value="22">22</option>
          <option value="23">23</option>
          <option value="24">24</option>
          <option value="25">25</option>
          <option value="26">26</option>
          <option value="27">27</option>
          <option value="28">28</option>
          <option value="29">29</option>
          <option value="30">30</option>
          <option value="31">31</option>
        </select>
    </div>

    <div class="selectmenu xsmall-type1 inputDOB">
        <select id="Month" name="EventDateMonth" aria-required="true" class="js-selectmenu" data-val-required="Please tell us your full date of birth" data-val="true">
          <option value="">MM</option>
          <option value="01">01</option>
          <option value="02">02</option>
          <option value="03">03</option>
          <option value="04">04</option>
          <option value="05">05</option>
          <option value="06">06</option>
          <option value="07">07</option>
          <option value="08">08</option>
          <option value="09">09</option>
          <option value="10">10</option>
          <option value="11">11</option>
          <option value="12">12</option>
        </select>
    </div>


    <input id="EventYear" 
      type="text" 
      name="EventYear" 
      class="form_input--inline inputDOB" 
      aria-required="true" 
      placeholder="YYYY" 
      data-val-required="Please tell us your full date of birth"
      data-val-length-max="4" data-val-regex="Event Date is invalid."
      data-val-length="Event Date must be less than 4 characters."
      data-val-daymonthyear="{0} is required." 
      data-val-regex-pattern="^[0-9]*$"  
      maxlength="4" 
      data-val="true" />
    <div class="error-message" role="alert">
      <div class="error-text">
        <p><span class="field-validation-valid" data-valmsg-for="DOB" data-valmsg-replace="true">Please tell us your event date</span></p>
        <img src="http://res.cloudinary.com/df821af5o/image/upload/v1499521750/mcr-error-bg_wfz31v.png" alt="">
      </div>
    </div>
    <div class="inline-error-message">
        <div class="error-text">
            <p></p>
            
        </div>
    </div>
</div>
<div class="row" id="EventDateEnd">
    <label for="DateEnd">Event End Date (optional) </label>
    <div class="selectmenu xsmall-type1 inputDOB">
        <select id="DateEnd" name="EventFullDateEnd" class="js-selectmenu" data-val="true">
          <option value="">DD</option>
          <option value="01">01</option>
          <option value="02">02</option>
          <option value="03">03</option>
          <option value="04">04</option>
          <option value="05">05</option>
          <option value="06">06</option>
          <option value="07">07</option>
          <option value="08">08</option>
          <option value="09">09</option>
          <option value="10">10</option>
          <option value="11">11</option>
          <option value="12">12</option>
          <option value="13">13</option>
          <option value="14">14</option>
          <option value="15">15</option>
          <option value="16">16</option>
          <option value="17">17</option>
          <option value="18">18</option>
          <option value="19">19</option>
          <option value="20">20</option>
          <option value="21">21</option>
          <option value="22">22</option>
          <option value="23">23</option>
          <option value="24">24</option>
          <option value="25">25</option>
          <option value="26">26</option>
          <option value="27">27</option>
          <option value="28">28</option>
          <option value="29">29</option>
          <option value="30">30</option>
          <option value="31">31</option>
        </select>
    </div>

    <div class="selectmenu xsmall-type1 inputDOB">
        <select id="MonthEnd" name="EventFullDateEnd" class="js-selectmenu" data-val="true">
          <option value="">MM</option>
          <option value="01">01</option>
          <option value="02">02</option>
          <option value="03">03</option>
          <option value="04">04</option>
          <option value="05">05</option>
          <option value="06">06</option>
          <option value="07">07</option>
          <option value="08">08</option>
          <option value="09">09</option>
          <option value="10">10</option>
          <option value="11">11</option>
          <option value="12">12</option>
        </select>
    </div>


    <input id="EventYearEnd" 
      type="text" 
      name="EventFullDateEnd" 
      class="form_input--inline inputDOB" 
      placeholder="YYYY" 
      data-val-length-max="4" data-val-regex="Event Date is invalid."
      data-val-length="Event Date must be less than 4 characters."
      data-val-daymonthyear="{0} is required." 
      data-val-regex-pattern="^[0-9]*$"  
      maxlength="4" 
      data-val="true" />
    <div class="error-message" role="alert">
      <div class="error-text">
        <p><span class="field-validation-valid" data-valmsg-for="EventFullDateEnd" data-valmsg-replace="true">Please tell us your event end date</span></p>
        <img src="http://res.cloudinary.com/df821af5o/image/upload/v1499521750/mcr-error-bg_wfz31v.png" alt="">
      </div>
    </div>
    <div class="inline-error-message">
        <div class="error-text">
            <p></p>
            
        </div>
    </div>
</div>
!

CSS 

              
                .macmillan-form .field .error-text {
    color: #FFF;
    display: block;
    font-size: 14px;
    padding: 10px;
    position: relative;
    z-index: 2;
}

.error-handler .error-text {
    color: #FFF;
    display: block;
    font-size: 14px;
    padding: 10px;
    position: relative;
    z-index: 2;
}

.error-handler .error-text img {
    width: 100%;
    height: 100%;
    top: 0;
    right: 0;
    position: absolute;
    z-index: -1;
}

error-handler .error-text p {
    font-size: 1em;
    margin: 0;
}

.error-handler .error-message {
    display: block !important;
    margin: 0;
    max-width: 454px;
    width: 100%;
    z-index: 2;
}

.error-message {
    position: relative;
    padding-top: 15px;
    display: none;
}
.error-message {
    position: relative;
    padding-top: 15px;
    display: none;
}
!

JS 

              
                //Event date validation starts here
var validEventDate = true;

$('#Date, #Month, #EventYear').on('change', function() {
    if (validateEventDate()) {
        if ($('#DateEnd').val() === "" && $('#MonthEnd').val() === '' && $('#EventYearEnd').val() === '') {
            handleErrorMessage(true)
            validEventDate = true
            console.log("error2-1")
        } else {
            var startDate1 = new Date($('#EventYear').val() + '-' + $('#Month').val() + '-' + $('#Date').val())
            var endDate1 = new Date($('#EventYearEnd').val() + '-' + $('#MonthEnd').val() + '-' + $('#DateEnd').val())
            if (endDate1 >= startDate1) {
                handleErrorMessage(true)
                validEventDate = true;
                //added later
                handleErrorMessageEnd(true)
                validEventDateEnd = true;
                console.log("error2-2")
            } else {
                validEventDateEnd = false;
                //handleErrorMessageLessthan(false);
              handleErrorMessageEnd(false)
                console.log("error2-3")
            }
            //handleErrorMessageEnd(true)
            //validEventDateEnd = true;
            handleErrorMessage(true)
            validEventDate = true;
            console.log("special-error1")
        }
    } else {
        handleErrorMessage(false)
        validEventDate = false 
        console.log("error2-4")
    }
})

function handleErrorMessage(op) {
    if (!op) {
        $('#EventDate').addClass('error-handler')
        $('#EventDate').find('.error-message').find('.error-text p').html('Please enter a valid event date.')
    } else {
        $('#EventDate').removeClass('error-handler')
        $('#EventDate').find('.error-message').find('.error-text p').html('')
    }
}
function handleErrorMessageLessthan(op) {
    if (!op) {
        $('#EventDate').addClass('error-handler')
        $('#EventDate').find('.error-message').find('.error-text p').html('Please enter a valid event date less than event end date.')
    } else {
        $('#EventDate').removeClass('error-handler')
        $('#EventDate').find('.error-message').find('.error-text p').html('')
    }
}

function validateEventDate() {
    var $day = $('select[id="Date"] option:selected'),
        $month = $('select[id="Month"] option:selected'),
        $year = $('input[id="EventYear"]'),
        dayStr = $day.text(),
        monthStr = $month.text(),
        yearStr = $year.val(),
        dayIndex = $day.index(),
        monthIndex = $month.index(),
        yearIndex = yearStr;

    if (dayIndex > 0 || monthIndex > 0 || yearIndex > 0) {
        if (dayIndex > 0 && monthIndex > 0 && yearIndex > 0) {

            if (dayIndex > 29 && monthIndex == 2) {
                return false
            }

            if ((dayIndex > 30) && (monthIndex == 4 || monthIndex == 6 || monthIndex == 9 || monthIndex == 11)) {
                return false
            }

            eventDate = new Date(yearStr + '/' + monthStr + '/' + dayStr);
            nowDate = new Date();
          
            var holidays = [new Date("2017/12/25"), new Date("2017/12/26"),  new Date("2017/12/27")];
            if (isNaN(eventDate)) {
                return false;
            } else {
                if (eventDate < nowDate || eventDate.getDay() === 6 || eventDate.getDay() === 0 ) {
                    return false;
                } else {
                   // var eventHoliday = holidays.filter(function(holiday) {
                   //  return holiday === eventDate
                   // });
                   for (var i = 0; i < holidays.length; i++) {
                       if (eventDate.getTime() === holidays[i].getTime()) {
                         return false;
                       }
                    }
                  
                    // for (var i = 0; i < holidays.length; i++) {
                    //    if (eventDate.getTime() !== holidays[i].getTime()) {
                    //      console.log('foo');
                    //      return true
                    //    } else {
                    //      return false
                    //    }
                    // }
                   // if (!!eventHoliday) {
                   //     return false
                   //  } else {
                   //    return true
                   //  }
                   return true
                }
            }
        } else {
            return false;
        }
    } else {
        return false;
    }
}
//Event date validation ends here

//Event End date validation starts here
var validEventDateEnd = true;

$('#DateEnd, #MonthEnd, #EventYearEnd').on('change', function() {

    if (validateEventDateEnd()) {
        if ($('#Date').val() === "" && $('#Month').val() === '' && $('#EventYear').val() === '') {
            handleErrorMessage(false)
            validEventDate = false;
            console.log("error0")
        } else {
            var startDate = new Date($('#EventYear').val() + '-' + $('#Month').val() + '-' + $('#Date').val())
            var endDate = new Date($('#EventYearEnd').val() + '-' + $('#MonthEnd').val() + '-' + $('#DateEnd').val())
            console.log("error1")
            if (endDate >= startDate) {
                handleErrorMessageEnd(true)
                validEventDateEnd = true;
                console.log("error2")
              
            } else {
                handleErrorMessageEnd(false)
                validEventDateEnd = false;
                console.log("special-error2")
            }
            console.log("error3")
        }
    } else {
        if ($('#DateEnd').val() === "" && $('#MonthEnd').val() === '' && $('#EventYearEnd').val() === '') {        
            if (validateEventDate() ) {
              handleErrorMessage(true)
              validEventDate = true;
              console.log("error4-1")
             } else {
              handleErrorMessageEnd(false)
              validEventDateEnd = false;
              console.log("error4-2")
             }
          handleErrorMessageEnd(true)
          validEventDateEnd = true;
          console.log("error4")
        } else {
            handleErrorMessageEnd(false)
            validEventDateEnd = false;
            console.log("error5")
        }
    }
})

function handleErrorMessageEnd(op) {
    if (!op) {
        $('#EventDateEnd').addClass('error-handler')
        $('#EventDateEnd').find('.error-message').find('.error-text p').html('Please enter a valid event end date greater or same than the event date.')
    } else {
        $('#EventDateEnd').removeClass('error-handler')
        $('#EventDateEnd').find('.error-message').find('.error-text p').html('')
    }
}

function validateEventDateEnd() {
    var $day = $('select[id="DateEnd"] option:selected'),
        $month = $('select[id="MonthEnd"] option:selected'),
        $year = $('input[id="EventYearEnd"]'),
        dayStr = $day.text(),
        monthStr = $month.text(),
        yearStr = $year.val(),
        dayIndex = $day.index(),
        monthIndex = $month.index(),
        yearIndex = yearStr;

    if (dayIndex > 0 || monthIndex > 0 || yearIndex > 0) {
        if (dayIndex > 0 && monthIndex > 0 && yearIndex > 0) {

            if (dayIndex > 29 && monthIndex == 2) {
                return false
            }

            if ((dayIndex > 30) && (monthIndex == 4 || monthIndex == 6 || monthIndex == 9 || monthIndex == 11)) {
                return false
            }

            eventDate = new Date(yearStr + '/' + monthStr + '/' + dayStr);
            nowDate = new Date();

            if (isNaN(eventDate)) {
                return false;
            } else {
                if (eventDate < nowDate) {
                    return false;
                } else {
                    return true
                }
            }

        } else {
            return false;
        }
    } else {
        return false;
    }
}
//Event End date validation ends here


function navigateToError() {
    var errorDiv = $('.error-message:visible').first();
    var scrollPosition = errorDiv.offset().top - 60;
    $(window).scrollTop(scrollPosition);
}


// For all steps-forms and other forms -Enter key disble submit forms
$('.js-macmillan-stepped-form input').on('keyup keypress',  function(e) {
  var keyCode = e.keyCode || e.which;
  if (keyCode === 13) { 
    e.preventDefault();
    return false;
  }
});
!
999px

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