diff --git a/addons/event/data/mail_template_data.xml b/addons/event/data/mail_template_data.xml
index 8bf5414e11a..4bc9af2151f 100644
--- a/addons/event/data/mail_template_data.xml
+++ b/addons/event/data/mail_template_data.xml
@@ -35,8 +35,8 @@
             <field name="email_to">${(object.email and '"%s" &lt;%s&gt;' % (object.name, object.email) or object.partner_id.email_formatted or '') | safe}</field>
             <field name="body_html" type="html">
 <table border="0" cellpadding="0" cellspacing="0" style="padding-top: 16px; background-color: #F1F1F1; font-family:Verdana, Arial,sans-serif; color: #454748; width: 100%; border-collapse:separate;"><tr><td align="center">
-% set date_begin = format_datetime(object.event_id.date_begin, tz='UTC', dt_format='yyyyMMdd\'T\'HHmmssZ')
-% set date_end = format_datetime(object.event_id.date_end, tz='UTC', dt_format='yyyyMMdd\'T\'HHmmssZ')
+% set date_begin = format_datetime(object.event_id.date_begin, tz='UTC', dt_format="yyyyMMdd'T'HHmmss'Z'")
+% set date_end = format_datetime(object.event_id.date_end, tz='UTC', dt_format="yyyyMMdd'T'HHmmss'Z'")
 % set is_online = 'is_published' in object.event_id and object.event_id.is_published
 % set event_organizer = object.event_id.organizer_id
 % set event_address = object.event_id.address_id
@@ -259,8 +259,8 @@
             <field name="email_to">${(object.email and '"%s" &lt;%s&gt;' % (object.name, object.email) or object.partner_id.email_formatted or '') | safe}</field>
             <field name="body_html" type="html">
 <table border="0" cellpadding="0" cellspacing="0" style="padding-top: 16px; background-color: #F1F1F1; font-family:Verdana, Arial,sans-serif; color: #454748; width: 100%; border-collapse:separate;"><tr><td align="center">
-% set date_begin = format_datetime(object.event_id.date_begin, tz='UTC', dt_format='yyyyMMdd\'T\'HHmmssZ')
-% set date_end = format_datetime(object.event_id.date_end, tz='UTC', dt_format='yyyyMMdd\'T\'HHmmssZ')
+% set date_begin = format_datetime(object.event_id.date_begin, tz='UTC', dt_format="yyyyMMdd'T'HHmmss'Z'")
+% set date_end = format_datetime(object.event_id.date_end, tz='UTC', dt_format="yyyyMMdd'T'HHmmss'Z'")
 % set is_online = 'is_published' in object.event_id and object.event_id.is_published
 % set event_organizer = object.event_id.organizer_id
 % set event_address = object.event_id.address_id
diff --git a/addons/event/i18n/event.pot b/addons/event/i18n/event.pot
index 20a6dd0e965..f00bbfa5289 100644
--- a/addons/event/i18n/event.pot
+++ b/addons/event/i18n/event.pot
@@ -237,8 +237,8 @@ msgstr ""
 #: model:mail.template,body_html:event.event_subscription
 msgid ""
 "<table border=\"0\" cellpadding=\"0\" cellspacing=\"0\" style=\"padding-top: 16px; background-color: #F1F1F1; font-family:Verdana, Arial,sans-serif; color: #454748; width: 100%; border-collapse:separate;\"><tr><td align=\"center\">\n"
-"% set date_begin = format_datetime(object.event_id.date_begin, tz='UTC', dt_format='yyyyMMdd\\'T\\'HHmmssZ')\n"
-"% set date_end = format_datetime(object.event_id.date_end, tz='UTC', dt_format='yyyyMMdd\\'T\\'HHmmssZ')\n"
+"% set date_begin = format_datetime(object.event_id.date_begin, tz='UTC', dt_format=\"yyyyMMdd'T'HHmmss'Z'\")\n"
+"% set date_end = format_datetime(object.event_id.date_end, tz='UTC', dt_format=\"yyyyMMdd'T'HHmmss'Z'\")\n"
 "% set is_online = 'is_published' in object.event_id and object.event_id.is_published\n"
 "% set event_organizer = object.event_id.organizer_id\n"
 "% set event_address = object.event_id.address_id\n"
@@ -455,8 +455,8 @@ msgstr ""
 #: model:mail.template,body_html:event.event_reminder
 msgid ""
 "<table border=\"0\" cellpadding=\"0\" cellspacing=\"0\" style=\"padding-top: 16px; background-color: #F1F1F1; font-family:Verdana, Arial,sans-serif; color: #454748; width: 100%; border-collapse:separate;\"><tr><td align=\"center\">\n"
-"% set date_begin = format_datetime(object.event_id.date_begin, tz='UTC', dt_format='yyyyMMdd\\'T\\'HHmmssZ')\n"
-"% set date_end = format_datetime(object.event_id.date_end, tz='UTC', dt_format='yyyyMMdd\\'T\\'HHmmssZ')\n"
+"% set date_begin = format_datetime(object.event_id.date_begin, tz='UTC', dt_format=\"yyyyMMdd'T'HHmmss'Z'\")\n"
+"% set date_end = format_datetime(object.event_id.date_end, tz='UTC', dt_format=\"yyyyMMdd'T'HHmmss'Z'\")\n"
 "% set is_online = 'is_published' in object.event_id and object.event_id.is_published\n"
 "% set event_organizer = object.event_id.organizer_id\n"
 "% set event_address = object.event_id.address_id\n"