firefly-iii/resources/views/form/date.twig

<div class="{{ classes }}" id="{{ name }}_holder">
    <label for="{{ options.id }}" class="col-sm-4 control-label">{{ label }}</label>

    <div class="col-sm-8">
        <div class="input-group">
            <div class="input-group-addon">
                <i class="fa fa-calendar"></i>
            </div>
            {{ Form.input('date', name, value, options) }}
        </div>
        {% include 'form/help' %}
        {% include 'form/feedback' %}
    </div>
</div>