<div class="his-timerange">
    <?php echo $this->element->getElement('his_date_start') ?>
    <?php echo $this->element->getElement('his_time_start') ?>
    <?php echo $this->element->getElement('his_date_end') ?>
    <?php echo $this->element->getElement('his_time_end') ?>
    <input type="button" id="his_submit" class="ui-button ui-state-default" value="GO"></input>
</div>