fastapi-admin/fastapi_admin/templates/widgets/inputs/datetime.html

<script type="text/javascript" src="https://cdn.jsdelivr.net/npm/daterangepicker/daterangepicker.min.js"></script>
<link rel="stylesheet" type="text/css" href="https://cdn.jsdelivr.net/npm/daterangepicker/daterangepicker.css"/>
<div class="form-group">
    <label class="form-label">{{ label }}</label>
    <input {% if not null %}required{% endif %} type="{{ input_type }}" class="form-control" name="{{ name }}"
           placeholder="{{ placeholder }}" {% if disabled %}disabled{% endif %} value="{{ value }}">
    {% if help_text %}
        <small class="form-hint">
            {{ help_text }}
        </small>
    {% endif %}
</div>

{% block script %}
    <script>
        $(function () {
            $('input[name="{{ name }}"]').daterangepicker({
                singleDatePicker: true,
                timePicker: true,
                showDropdowns: true,
                locale: {
                    format: 'YYYY-MM-DD HH:mm:ss'
                }
            });
        });
    </script>
{% endblock %}