JSFiddle - React, Tailwind, and code Playground

HTML

<table width="100%" border="1" cellspacing="0" cellpadding="0" id="table-data" class="table_clone">
    <tr>
                <th style="border-left: none;">
                    Select
                </th>
                <th>
                    Activity No.
                </th>
                <th>
                    Description
                </th>
                <th>
                    Start Date
                </th>
                <th>
                    End Date
                </th>
                <th>
                    Results
                </th>
            </tr>
     <tr class="tr_clone">
    <td><input type="checkbox"  name="who"  /></td>
    <td><input type="text"  name="location" value="pozition"/></td>
    <td><textarea  name="descriere" rows="5" cols="20">enter desciption</textarea></td>
    <td><input type="text"  name="datepicker_start" class="date_holder datepicker" /></td>
    <td><input type="text"  name="datepicker_end" class="date_holder datepicker" /></td>
    <td><input type="button" name="add" value="Rezultate"  onclick="openWindowResults(this.id)"/></td>
    <td><input type="button" name="add" value="Add" class="tr_clone_add"/></td>
  </tr>
</table><!-- /table#table-data -->

JavaScript

// Date Picker
$(".datepicker").datepicker();
// Clone Function
$("input.tr_clone_add").live('click', function() {
    $(".datepicker").datepicker("destroy");
    $(".datepicker").removeClass("hasDatepicker").removeAttr('id');
    $(this).closest('.tr_clone').after($(this).closest('.tr_clone').clone());
    $(this).parents('tr').next().find(':text').val('');
    $(".datepicker").datepicker();
});