diff --git a/addons/hr_payroll/models/resource.py b/addons/hr_payroll/models/resource.py
index 25985687c11..b989eb4ab4a 100644
--- a/addons/hr_payroll/models/resource.py
+++ b/addons/hr_payroll/models/resource.py
@@ -2,7 +2,7 @@
 # Part of Odoo. See LICENSE file for full copyright and licensing details.
 
 from odoo import models, fields, api
-
+from odoo.addons.resource.models.resource_mixin import timezone_datetime
 
 class ResourceCalendar(models.Model):
     _inherit = 'resource.calendar'
@@ -61,8 +61,8 @@ class ResourceMixin(models.AbstractModel):
         domain = [('benefit_type_id', 'in', benefit_type_ids)]
 
         # naive datetimes are made explicit in UTC
-        from_datetime = self._timezone_datetime(from_datetime)
-        to_datetime = self._timezone_datetime(to_datetime)
+        from_datetime = timezone_datetime(from_datetime)
+        to_datetime = timezone_datetime(to_datetime)
 
         day_total = self._get_day_total(from_datetime, to_datetime, calendar, resource)
         # actual hours per day
diff --git a/addons/hr_payroll/views/hr_benefit_views.xml b/addons/hr_payroll/views/hr_benefit_views.xml
index 6aa46656a4c..12fc3b40729 100644
--- a/addons/hr_payroll/views/hr_benefit_views.xml
+++ b/addons/hr_payroll/views/hr_benefit_views.xml
@@ -45,8 +45,7 @@ if records:
                                     <span class="fa fa-exclamation-triangle mr-2" aria-label="Conflict" title="error"/>
                                 </t>
                                 <t t-if="record.state == 'validated'">
-                                    <span class="fa fa-check-circle-o" aria-label="Validated" title="validated"/>
-                                    <t t-esc="' '"/>
+                                    <span class="fa fa-check-circle-o mr-2" aria-label="Validated" title="validated"/>
                                 </t>
                                 <t t-foreach="widget.displayFields" t-as="name">
                                     <t t-esc="format(record, name)"/>
@@ -67,7 +66,7 @@ if records:
                 <header>
                     <field name="display_warning" invisible="1"/>
                     <field name="leave_id" invisible="1"/>
-                    <button string="Go To Conflicting Leave" name="action_leave" type="object" attrs="{'invisible': ['|', '|', '!',('display_warning', '=', True), '!', ('leave_id', '!=', False), ('benefit_type_id', '=', False)]}"/>
+                    <button string="Go To Conflicting Leave" name="action_leave" type="object" attrs="{'invisible': ['|', '|', '!',('display_warning', '=', True), ('leave_id', '=', False), ('benefit_type_id', '=', False)]}"/>
                     <field name="state" widget="statusbar" options="{'clickable': '1'}"/>
                 </header>
                 <sheet>
diff --git a/addons/resource/models/resource.py b/addons/resource/models/resource.py
index fd0e8260fc5..53bdf87ce09 100644
--- a/addons/resource/models/resource.py
+++ b/addons/resource/models/resource.py
@@ -11,6 +11,7 @@ from pytz import timezone, utc
 from odoo import api, fields, models, _
 from odoo.addons.base.models.res_partner import _tz_get
 from odoo.exceptions import ValidationError
+from odoo.osv import expression
 from odoo.tools.float_utils import float_round
 
 # Default hour per day value. The one should
@@ -211,10 +212,10 @@ class ResourceCalendar(models.Model):
 
         resource_ids = [resource.id, False] if resource else [False]
         domain = domain if domain is not None else []
-        domain = domain + [
+        domain = expression.AND([domain, [
             ('calendar_id', '=', self.id),
             ('resource_id', 'in', resource_ids),
-        ]
+        ]])
 
         # express all dates and times in the resource's timezone
         tz = timezone((resource or self).tz)
diff --git a/addons/resource/models/resource_mixin.py b/addons/resource/models/resource_mixin.py
index 68541f891c0..f1dc84564da 100644
--- a/addons/resource/models/resource_mixin.py
+++ b/addons/resource/models/resource_mixin.py
@@ -12,6 +12,12 @@ from odoo.tools import float_utils
 ROUNDING_FACTOR = 16
 
 
+def timezone_datetime(time):
+    if not time.tzinfo:
+        time = time.replace(tzinfo=utc)
+    return time
+
+
 class ResourceMixin(models.AbstractModel):
     _name = "resource.mixin"
     _description = 'Resource Mixin'
@@ -75,7 +81,7 @@ class ResourceMixin(models.AbstractModel):
 
     def _get_day_total(self, from_datetime, to_datetime, calendar, resource):
         """
-        @return dict with hours of attendance in each day between `from_datetime` and `to_datetime`
+        :return: dict with hours of attendance in each day between `from_datetime` and `to_datetime`
         """
 
         # total hours per day:  retrieve attendances with one extra day margin,
@@ -88,12 +94,6 @@ class ResourceMixin(models.AbstractModel):
             day_total[start.date()] += (stop - start).total_seconds() / 3600
         return day_total
 
-    def _timezone_datetime(self, time):
-        if not time.tzinfo:
-            time = time.replace(tzinfo=utc)
-        return time
-
-
     def _get_work_days_data(self, from_datetime, to_datetime, compute_leaves=True, calendar=None, domain=None):
         """
             By default the resource calendar is used, but it can be
@@ -109,8 +109,8 @@ class ResourceMixin(models.AbstractModel):
         calendar = calendar or self.resource_calendar_id
 
         # naive datetimes are made explicit in UTC
-        from_datetime = self._timezone_datetime(from_datetime)
-        to_datetime = self._timezone_datetime(to_datetime)
+        from_datetime = timezone_datetime(from_datetime)
+        to_datetime = timezone_datetime(to_datetime)
 
         day_total = self._get_day_total(from_datetime, to_datetime, calendar, resource)
 
@@ -137,8 +137,8 @@ class ResourceMixin(models.AbstractModel):
         calendar = calendar or self.resource_calendar_id
 
         # naive datetimes are made explicit in UTC
-        from_datetime = self._timezone_datetime(from_datetime)
-        to_datetime = self._timezone_datetime(to_datetime)
+        from_datetime = timezone_datetime(from_datetime)
+        to_datetime = timezone_datetime(to_datetime)
 
         day_total = self._get_day_total(from_datetime, to_datetime, calendar, resource)