diff --git a/administrator/components/com_content/models/forms/article.xml b/administrator/components/com_content/models/forms/article.xml
index 921580f590968..e2bd5ee3b4df6 100644
--- a/administrator/components/com_content/models/forms/article.xml
+++ b/administrator/components/com_content/models/forms/article.xml
@@ -68,7 +68,6 @@
 		<field name="created" type="calendar" label="COM_CONTENT_FIELD_CREATED_LABEL"
 			description="COM_CONTENT_FIELD_CREATED_DESC"
 			translateformat="true"
-			weeknumbers="true"
 			showtime="true"
 			size="22"
 			filter="user_utc" />
diff --git a/libraries/cms/html/html.php b/libraries/cms/html/html.php
index b578e57ed420c..41a475eba0d96 100644
--- a/libraries/cms/html/html.php
+++ b/libraries/cms/html/html.php
@@ -1019,7 +1019,7 @@ public static function calendar($value, $name, $id, $format = '%Y-%m-%d', $attri
 		$required     = isset($attribs['required']) && $attribs['required'] == '';
 		$filter       = isset($attribs['filter']) && $attribs['filter'] == '';
 		$todayBtn     = isset($attribs['todayBtn']) ? $attribs['todayBtn'] : true;
-		$weekNumbers  = isset($attribs['weekNumbers']) ? $attribs['weekNumbers'] : false;
+		$weekNumbers  = isset($attribs['weekNumbers']) ? $attribs['weekNumbers'] : true;
 		$showTime     = isset($attribs['showTime']) ? $attribs['showTime'] : false;
 		$fillTable    = isset($attribs['fillTable']) ? $attribs['fillTable'] : true;
 		$timeFormat   = isset($attribs['timeFormat']) ? $attribs['timeFormat'] : 24;
diff --git a/libraries/joomla/form/fields/calendar.php b/libraries/joomla/form/fields/calendar.php
index 341d2fc0a3a1a..d41d03731a9cd 100644
--- a/libraries/joomla/form/fields/calendar.php
+++ b/libraries/joomla/form/fields/calendar.php
@@ -164,7 +164,7 @@ public function setup(SimpleXMLElement $element, $value, $group = null)
 			$this->format       = (string) $this->element['format'] ? (string) $this->element['format'] : '%Y-%m-%d';
 			$this->filter       = (string) $this->element['filter'] ? (string) $this->element['filter'] : 'USER_UTC';
 			$this->todaybutton  = (string) $this->element['todaybutton'] ? (string) $this->element['todaybutton'] : 'true';
-			$this->weeknumbers  = (string) $this->element['weeknumbers'] ? (string) $this->element['weeknumbers'] : 'false';
+			$this->weeknumbers  = (string) $this->element['weeknumbers'] ? (string) $this->element['weeknumbers'] : 'true';
 			$this->showtime     = (string) $this->element['showtime'] ? (string) $this->element['showtime'] : 'false';
 			$this->filltable    = (string) $this->element['filltable'] ? (string) $this->element['filltable'] : 'true';
 			$this->timeformat   = (int) $this->element['timeformat'] ? (int) $this->element['timeformat'] : 24;