account-financial-reporting/account_financial_report/report/templates/layouts.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>

    <template id="account_financial_report.internal_layout">
        <div class="article">
            <link href="/account_financial_report/static/src/css/report.css" rel="stylesheet"/>
          <t t-raw="0" />
        </div>

        <div class="footer">
            <div class="row">
                <div class="col-6 custom_footer">
                    <span t-esc="context_timestamp(datetime.datetime.now()).strftime('%Y-%m-%d %H:%M')"/>
                </div>
                <div class="col-6 text-right custom_footer">
                    <ul class="list-inline">
                        <li class="list-inline-item"><span class="page"/></li>
                        <li class="list-inline-item">/</li>
                        <li class="list-inline-item"><span class="topage"/></li>
                    </ul>
                </div>
            </div>
        </div>
    </template>

</odoo>