diff --git a/addons/hr_timesheet/report/report_timesheet_templates.xml b/addons/hr_timesheet/report/report_timesheet_templates.xml
index fea714a5d7a..dbc0ad4a583 100644
--- a/addons/hr_timesheet/report/report_timesheet_templates.xml
+++ b/addons/hr_timesheet/report/report_timesheet_templates.xml
@@ -44,7 +44,7 @@
                                                 <t t-if="l.task_id"><span t-field="l.task_id.name"/></t>
                                             </td>
                                             <td class="text-right">
-                                                <span t-esc="'%s:%02.0f' % tuple(int(round(x)) for x in divmod(l.unit_amount*60,60))"/>
+                                                <span t-field="l.unit_amount" t-options="{'widget': 'float_time'}"/>
                                             </td>
                                         </tr>
                                     </t>
@@ -53,7 +53,9 @@
                                         <td />
                                         <td t-if="show_task"/>
                                         <td class="text-right"><strong>Total</strong></td>
-                                        <td class="text-right"><strong t-esc="'%s:%02.0f' % tuple(int(round(x)) for x in divmod(sum(docs.mapped('unit_amount'))*60,60))"/></td>
+                                        <t t-set="total_value" t-value="sum(docs.mapped('unit_amount'))" />
+                                        <t t-set="sign" t-value="'-' if total_value &lt; 0 else ''"/>
+                                        <td class="text-right"><strong t-esc="sign + '%s:%02.0f' % tuple(int(round(x)) for x in divmod(abs(total_value)*60,60))"/></td>
                                     </tr>
                                 </tbody>
                             </table>
diff --git a/odoo/addons/base/ir/ir_qweb/fields.py b/odoo/addons/base/ir/ir_qweb/fields.py
index 69cb3631e5d..5a9000598de 100644
--- a/odoo/addons/base/ir/ir_qweb/fields.py
+++ b/odoo/addons/base/ir/ir_qweb/fields.py
@@ -7,6 +7,7 @@ from odoo import api, fields, models, _
 from PIL import Image
 import babel
 from lxml import etree
+import math
 
 from odoo.tools import html_escape as escape, posix_to_ldml, safe_eval, float_utils, format_date, pycompat
 
@@ -367,8 +368,9 @@ class FloatTimeConverter(models.AbstractModel):
 
     @api.model
     def value_to_html(self, value, options):
-        hours, minutes = divmod(value * 60, 60)
-        return '%02d:%02d' % (hours, minutes)
+        sign = math.copysign(1.0, value)
+        hours, minutes = divmod(abs(value) * 60, 60)
+        return '%02d:%02d' % (sign * hours, minutes)
 
 
 class DurationConverter(models.AbstractModel):