[FIX] event, website_event: timezone timestamp to compute one day

Have an event in Mexico timezone
As a begin date, choose something in the morning
As a end date, choose 18:00 in that timezone (or later)
in the same day
The end date will be written as the day after at 00:00 in UTC

Before this commit, the event was considered taking more than one day
Also, the rendering on the website took the wrong widget, and did not
transform the UTC dates into their TZ value

After this commit, the event is considered taking place in the same day
The rendering on the website is correct

OPW 2087828

closes odoo/odoo#39060

X-original-commit: 4514ff30e9cc218474dda4519e36cfc983e49fc8
Signed-off-by: Lucas Perais (lpe) <lpe@odoo.com>

3 files changed, 17 insertions, 9 deletions

diff --git a/addons/event/models/event.py b/addons/event/models/event.py
index ced20b54b8f..433aaccf7b5 100644
--- a/addons/event/models/event.py
+++ b/addons/event/models/event.py
@@ -241,7 +241,9 @@ class EventEvent(models.Model):
             # Need to localize because it could begin late and finish early in
             # another timezone
             event = event.with_context(tz=event.date_tz)
-            event.is_one_day = (event.date_begin.date() == event.date_end.date())
+            begin_tz = fields.Datetime.context_timestamp(event, event.date_begin)
+            end_tz = fields.Datetime.context_timestamp(event, event.date_end)
+            event.is_one_day = (begin_tz.date() == end_tz.date())
 
     @api.onchange('is_online')
     def _onchange_is_online(self):
diff --git a/addons/event/tests/test_event_flow.py b/addons/event/tests/test_event_flow.py
index 7a2364ac4c9..8121528596b 100644
--- a/addons/event/tests/test_event_flow.py
+++ b/addons/event/tests/test_event_flow.py
@@ -116,6 +116,12 @@ class TestEventFlow(TestEventCommon):
     def test_event_data(self):
         self.event_0.write({'registration_ids': [(0, 0, {'partner_id': self.user_eventuser.partner_id.id})]})
         self.assertEqual(self.event_0.registration_ids.get_date_range_str(), u'tomorrow')
+        self.event_0.write({
+            'date_begin': '2019-11-09 14:30:00',
+            'date_end': '2019-11-10 00:00:00',
+            'date_tz': 'Mexico/General'
+        })
+        self.assertTrue(self.event_0.is_one_day)
 
     def test_event_date_range(self):
         self.event_0.write({'registration_ids': [(0, 0, {'partner_id': self.user_eventuser.partner_id.id})]})
diff --git a/addons/website_event/views/event_templates.xml b/addons/website_event/views/event_templates.xml
index 9f51854ab3c..25b891c6685 100644
--- a/addons/website_event/views/event_templates.xml
+++ b/addons/website_event/views/event_templates.xml
@@ -188,8 +188,8 @@
 
                             <!-- Short Date -->
                             <div class="o_wevent_event_date position-absolute bg-white shadow-sm">
-                                <span t-esc="event.with_context(tz=event.date_tz).date_begin" t-options="{'widget': 'date', 'format': 'LLL'}" class="o_wevent_event_month"/>
-                                <span t-esc="event.with_context(tz=event.date_tz).date_begin" t-options="{'widget': 'date', 'format': 'dd'}" class="o_wevent_event_day"/>
+                                <span t-field="event.with_context(tz=event.date_tz).date_begin" t-options="{'format': 'LLL'}" class="o_wevent_event_month"/>
+                                <span t-field="event.with_context(tz=event.date_tz).date_begin" t-options="{'format': 'dd'}" class="o_wevent_event_day"/>
                             </div>
                             <!-- Participating -->
                             <small t-if="event.is_participating" class="o_wevent_participating bg-success">
@@ -220,7 +220,7 @@
                         <div t-else="" itemprop="location" t-field="event.address_id" t-options="{'widget': 'contact', 'fields': ['city'], 'no_marker': 'true'}"/>
                         <!-- Start Date & Time -->
                         <time itemprop="startDate" t-att-datetime="event.date_begin">
-                            <span t-field="event.with_context(tz=event.date_tz).date_begin" t-options="{'widget': 'date', 'format': 'long'}"/> -
+                            <span t-field="event.with_context(tz=event.date_tz).date_begin" t-options="{'date_only': 'true', 'format': 'long'}"/> -
                             <span t-field="event.with_context(tz=event.date_tz).date_begin" t-options="{'time_only': 'true', 'format': 'short'}"/>
                         </time>
                     </main>
@@ -433,8 +433,8 @@
                         <!-- Date & Time -->
                         <div class="o_wevent_sidebar_block">
                             <h6 class="o_wevent_sidebar_title">Date &amp; Time</h6>
-                            <span t-esc="event.with_context(tz=event.date_tz).date_begin" t-options="{'widget': 'date', 'format': 'EEEE'}"/>
-                            <h4 class="my-1" t-field="event.with_context(tz=event.date_tz).date_begin" t-options="{'widget': 'date', 'format': 'long'}" itemprop="startDate" t-att-datetime="event.date_begin"/>
+                            <span t-field="event.with_context(tz=event.date_tz).date_begin" t-options="{'date_only': 'true', 'format': 'EEEE'}"/>
+                            <h4 class="my-1" t-field="event.with_context(tz=event.date_tz).date_begin" t-options="{'date_only': 'true', 'format': 'long'}" itemprop="startDate" t-att-datetime="event.date_begin"/>
                             <t t-if="not event.is_one_day">Start -</t>
                             <span t-field="event.with_context(tz=event.date_tz).date_begin" t-options="{'time_only': 'true', 'format': 'short'}"/>
                             <t t-if="event.is_one_day">
@@ -443,8 +443,8 @@
                             </t>
                             <t t-else="">
                                 <i class="fa fa-long-arrow-down d-block text-muted mx-3 my-2" style="font-size: 1.5rem"/>
-                                <span t-esc="event.with_context(tz=event.date_tz).date_begin" t-options="{'widget': 'date', 'format': 'EEEE'}"/>
-                                <h4 class="my-1" t-field="event.with_context(tz=event.date_tz).date_end" t-options="{'widget': 'date', 'format': 'long'}"/>
+                                <span t-field="event.with_context(tz=event.date_tz).date_begin" t-options="{'date_only': 'true', 'format': 'EEEE'}"/>
+                                <h4 class="my-1" t-field="event.with_context(tz=event.date_tz).date_end" t-options="{'date_only': 'true', 'format': 'long'}"/>
                                 <t t-if="not event.is_one_day">End -</t>
                                 <span t-field="event.with_context(tz=event.date_tz).date_end" t-options="{'time_only': 'true', 'format': 'short'}"/>
                             </t>
@@ -534,7 +534,7 @@
                 </t>
                 <t t-if="event.date_begin">
                     <t t-set="registration_end">
-                        End on <span t-field="event.with_context(tz=event.date_tz).date_begin" t-options="{'widget': 'date', 'format': 'medium'}"/>
+                        End on <span t-field="event.with_context(tz=event.date_tz).date_begin" t-options="{'date_only': 'true', 'format': 'medium'}"/>
                     </t>
                 </t>
                 <t t-set="quantity">