JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://code.jquery.com/jquery-1.12.4.js"></script>
<form name="buchenForm" id="bookingForm" method="get" action="searchresult1.php">
    <div>
        <input type="text" id="datepicker" value="<?php $datetime = new DateTime('tomorrow'); echo $datetime->format('d/m/Y'); ?>" class="form-control" />
        <input type="hidden" id="alt_date" name="selArrivalDate" value="<?php $datetime = new DateTime('tomorrow'); echo $datetime->format('Ymd'); ?>" />
    </div>
    <div class="form-group">
        <button  id="bookingSubmitBtn1" formaction="searchresult1.php">Search 1</button>
    </div>
    <div class="form-group">
        <button  id="bookingSubmitBtn2" formaction="searchresult2.php">Search 2</button>
    </div>
</form>

JavaScript

$(document).ready(function() {      
    $("#bookingSubmitBtn2").click(function() {
    	var hiddenElement = $('#bookingForm').find('input[name="selArrivalDate"]');
      console.log(hiddenElement);
        if (hiddenElement) {
            $(hiddenElement).remove();
        }       
        $("#bookingForm").submit();
    });
});