diff --git a/addons/mrp/models/mrp_workcenter.py b/addons/mrp/models/mrp_workcenter.py
index f180e79b2f3..75f3e2c5fcf 100644
--- a/addons/mrp/models/mrp_workcenter.py
+++ b/addons/mrp/models/mrp_workcenter.py
@@ -412,7 +412,7 @@ class MrpWorkcenterProductivity(models.Model):
     def _compute_duration(self):
         for blocktime in self:
             if blocktime.date_start and blocktime.date_end:
-                blocktime.duration = blocktime.loss_id._convert_to_duration(blocktime.date_start, blocktime.date_end, blocktime.workcenter_id)
+                blocktime.duration = blocktime.loss_id._convert_to_duration(blocktime.date_start.replace(microsecond=0), blocktime.date_end.replace(microsecond=0), blocktime.workcenter_id)
             else:
                 blocktime.duration = 0.0
 
@@ -460,7 +460,7 @@ class MrpWorkcenterProductivity(models.Model):
         underperformance_timers = self.env['mrp.workcenter.productivity']
         for timer in self:
             wo = timer.workorder_id
-            timer.write({'date_end': datetime.now()})
+            timer.write({'date_end': fields.Datetime.now()})
             if wo.duration > wo.duration_expected:
                 productive_date_end = timer.date_end - relativedelta.relativedelta(minutes=wo.duration - wo.duration_expected)
                 if productive_date_end <= timer.date_start:
diff --git a/addons/mrp/models/mrp_workorder.py b/addons/mrp/models/mrp_workorder.py
index 52b7661b19d..6ed4b61dbc8 100644
--- a/addons/mrp/models/mrp_workorder.py
+++ b/addons/mrp/models/mrp_workorder.py
@@ -636,7 +636,7 @@ class MrpWorkorder(models.Model):
             return self.with_context(bypass_duration_calculation=True).write(vals)
 
     def button_finish(self):
-        date_finished = datetime.now()
+        date_finished = fields.Datetime.now()
         for workorder in self:
             if workorder.state in ('done', 'cancel'):
                 continue
@@ -813,8 +813,8 @@ class MrpWorkorder(models.Model):
             'workcenter_id': self.workcenter_id.id,
             'description': _('Time Tracking: %(user)s', user=self.env.user.name),
             'loss_id': loss_id[0].id,
-            'date_start': date_start,
-            'date_end': date_end,
+            'date_start': date_start.replace(microsecond=0),
+            'date_end': date_end.replace(microsecond=0) if date_end else date_end,
             'user_id': self.env.user.id,  # FIXME sle: can be inconsistent with company_id
             'company_id': self.company_id.id,
         }
diff --git a/addons/mrp/static/src/widgets/timer.js b/addons/mrp/static/src/widgets/timer.js
index c56689bef6a..d878ed4a49d 100644
--- a/addons/mrp/static/src/widgets/timer.js
+++ b/addons/mrp/static/src/widgets/timer.js
@@ -17,7 +17,7 @@ function formatMinutes(value) {
         value = Math.abs(value);
     }
     let min = Math.floor(value);
-    let sec = Math.floor((value % 1) * 60);
+    let sec = Math.round((value % 1) * 60);
     sec = `${sec}`.padStart(2, "0");
     min = `${min}`.padStart(2, "0");
     return `${isNegative ? "-" : ""}${min}:${sec}`;