diff --git a/app/code/core/Mage/Adminhtml/Block/System/Config/Form/Field/AbstractDate.php b/app/code/core/Mage/Adminhtml/Block/System/Config/Form/Field/AbstractDate.php
new file mode 100644
index 000000000000..0b1777a3a927
--- /dev/null
+++ b/app/code/core/Mage/Adminhtml/Block/System/Config/Form/Field/AbstractDate.php
@@ -0,0 +1,96 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * OpenMage
+ *
+ * NOTICE OF LICENSE
+ *
+ * This source file is subject to the Open Software License (OSL 3.0)
+ * that is bundled with this package in the file LICENSE.txt.
+ * It is also available through the world-wide-web at this URL:
+ * http://opensource.org/licenses/osl-3.0.php
+ * If you did not receive a copy of the license and are unable to
+ * obtain it through the world-wide-web, please send an email
+ * to license@magento.com so we can send you a copy immediately.
+ *
+ * @category   Mage
+ * @package    Mage_Adminhtml
+ * @copyright  Copyright (c) 2006-2020 Magento, Inc. (http://www.magento.com)
+ * @copyright  Copyright (c) 2022 The OpenMage Contributors (https://www.openmage.org)
+ * @license    http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
+ */
+
+/**
+ * @category   Mage
+ * @package    Mage_Adminhtml
+ */
+abstract class Mage_Adminhtml_Block_System_Config_Form_Field_AbstractDate extends Mage_Adminhtml_Block_System_Config_Form_Field
+{
+    /**
+     * @return Varien_Data_Form_Element_Abstract
+     */
+    abstract protected function getDateClass(): Varien_Data_Form_Element_Abstract;
+
+    /**
+     * @param string $format
+     * @return string
+     */
+    abstract protected function getDateFormat(string $format): string;
+
+    /**
+     * @return bool Show date with time
+     */
+    abstract protected function isShowTime(): bool;
+
+    /**
+     * @param Varien_Data_Form_Element_Abstract $element
+     * @return string
+     */
+    protected function _getElementHtml(Varien_Data_Form_Element_Abstract $element)
+    {
+        /** @var Mage_Core_Model_Config_Element $field */
+        $field = $element->getFieldConfig();
+
+        $type = $element->getType();
+        if ($type !== 'date' && $type !== 'datetime' && $type !== 'text') {
+            Mage::throwException(
+                Mage::helper('adminhtml')->__(
+                    'Invalid frontend type for field "%s". Onyl "text", "date" and "datetime" are allowed.',
+                    $field->descend('label')
+                )
+            );
+        }
+
+        $format = Mage_Core_Helper_Date::getDateFormatFromString($field->format->__toString());
+        $format = $this->getDateFormat($format);
+
+        if (empty($field->editable)) {
+            return $this->getLocale()
+                ->date((int)$element->getValue())
+                ->toString($format);
+        }
+
+        $date = $this->getDateClass();
+        $date->setData([
+            'name'    => $element->getName(),
+            'html_id' => $element->getId(),
+            'image'   => $this->getSkinUrl('images/grid-cal.gif'),
+            'time'    => $this->isShowTime()
+        ]);
+        $date->setFormat($format);
+        $date->setValue($element->getValue());
+        $date->setForm($element->getForm());
+
+        return $date->getElementHtml();
+    }
+
+    /**
+     * @return Mage_Core_Model_Locale
+     */
+    public function getLocale()
+    {
+        return Mage::app()->getLocale();
+    }
+}
diff --git a/app/code/core/Mage/Adminhtml/Block/System/Config/Form/Field/Date.php b/app/code/core/Mage/Adminhtml/Block/System/Config/Form/Field/Date.php
index de3ac7bbec0e..02f25c443509 100644
--- a/app/code/core/Mage/Adminhtml/Block/System/Config/Form/Field/Date.php
+++ b/app/code/core/Mage/Adminhtml/Block/System/Config/Form/Field/Date.php
@@ -27,54 +27,31 @@
  *
  * @category   Mage
  * @package    Mage_Adminhtml
- * @author     Magento Core Team <core@magentocommerce.com>
  */
-class Mage_Adminhtml_Block_System_Config_Form_Field_Date extends Mage_Adminhtml_Block_System_Config_Form_Field
+class Mage_Adminhtml_Block_System_Config_Form_Field_Date extends Mage_Adminhtml_Block_System_Config_Form_Field_AbstractDate
 {
     /**
-     * Output date with time
-     * @var bool
+     * @return Varien_Data_Form_Element_Date
      */
-    protected $showTime = false;
+    protected function getDateClass(): Varien_Data_Form_Element_Date
+    {
+        return new Varien_Data_Form_Element_Date();
+    }
 
     /**
-     * @param Varien_Data_Form_Element_Abstract $element
+     * @param string $format
      * @return string
      */
-    protected function _getElementHtml(Varien_Data_Form_Element_Abstract $element)
+    protected function getDateFormat(string $format): string
     {
-        $field = $element->getFieldConfig();
-        if (!empty($format = $field->format) && defined('Mage_Core_Model_Locale::' . $format)) {
-            $format = constant('Mage_Core_Model_Locale::' . $format);
-        } else {
-            $format = Mage_Core_Model_Locale::FORMAT_TYPE_MEDIUM;
-        }
-
-        $locale = Mage::app()->getLocale();
-
-        // original way: getDateTimeFormat with FORMAT_TYPE_MEDIUM and return
-        $format = $this->showTime ? $locale->getDateTimeFormat($format) : $locale->getDateFormat($format);
-        if (empty($field->editable)) {
-            return $locale->date((int)$element->getValue())->toString($format);
-        }
-
-        $class = (!empty($field->frontend_type) && ($field->frontend_type != 'text')) ? 'Varien_Data_Form_Element_' . ucfirst(strtolower($field->frontend_type)) : '';
-        if (class_exists($class)) {
-            $date = new $class();
-        } else {
-            $date = $this->showTime ? new Varien_Data_Form_Element_Datetime() : new Varien_Data_Form_Element_Date();
-        }
-
-        $date->setData([
-            'name'    => $element->getName(),
-            'html_id' => $element->getId(),
-            'image'   => $this->getSkinUrl('images/grid-cal.gif'),
-            'time'    => $this->showTime,
-        ]);
-        $date->setFormat($format);
-        $date->setValue($element->getValue());
-        $date->setForm($element->getForm());
+        return $this->getLocale()->getDateFormat($format);
+    }
 
-        return $date->getElementHtml();
+    /**
+     * @return false
+     */
+    protected function isShowTime(): bool
+    {
+        return false;
     }
 }
diff --git a/app/code/core/Mage/Adminhtml/Block/System/Config/Form/Field/Datetime.php b/app/code/core/Mage/Adminhtml/Block/System/Config/Form/Field/Datetime.php
index e01d90707561..fe80f9e65ce2 100644
--- a/app/code/core/Mage/Adminhtml/Block/System/Config/Form/Field/Datetime.php
+++ b/app/code/core/Mage/Adminhtml/Block/System/Config/Form/Field/Datetime.php
@@ -24,9 +24,31 @@
  *
  * @category   Mage
  * @package    Mage_Adminhtml
- * @author     Magento Core Team <core@magentocommerce.com>
  */
-class Mage_Adminhtml_Block_System_Config_Form_Field_Datetime extends Mage_Adminhtml_Block_System_Config_Form_Field_Date
+class Mage_Adminhtml_Block_System_Config_Form_Field_Datetime extends Mage_Adminhtml_Block_System_Config_Form_Field_AbstractDate
 {
-    protected $showTime = true;
+    /**
+     * @return Varien_Data_Form_Element_Datetime
+     */
+    protected function getDateClass(): Varien_Data_Form_Element_Datetime
+    {
+        return new Varien_Data_Form_Element_Datetime();
+    }
+
+    /**
+     * @param string $format
+     * @return string
+     */
+    protected function getDateFormat(string $format): string
+    {
+        return $this->getLocale()->getDateTimeFormat($format);
+    }
+
+    /**
+     * @return true
+     */
+    protected function isShowTime(): bool
+    {
+        return true;
+    }
 }
diff --git a/app/code/core/Mage/Adminhtml/Block/System/Config/Form/Field/Label.php b/app/code/core/Mage/Adminhtml/Block/System/Config/Form/Field/Label.php
index 0559231d411f..fb0b63e3b99a 100644
--- a/app/code/core/Mage/Adminhtml/Block/System/Config/Form/Field/Label.php
+++ b/app/code/core/Mage/Adminhtml/Block/System/Config/Form/Field/Label.php
@@ -38,15 +38,20 @@ class Mage_Adminhtml_Block_System_Config_Form_Field_Label extends Mage_Adminhtml
     protected function _getElementHtml(Varien_Data_Form_Element_Abstract $element)
     {
         $field = $element->getFieldConfig();
-        $class = (!empty($field->frontend_type) && ($field->frontend_type != 'text')) ? 'Varien_Data_Form_Element_' . ucfirst(strtolower($field->frontend_type)) : '';
-        if (class_exists($class)) {
-            $label = new $class();
-        } else {
-            $label = new Varien_Data_Form_Element_Label();
+
+        $type = $element->getType();
+        if ($type !== 'label' && $type !== 'text') {
+            Mage::throwException(
+                Mage::helper('adminhtml')->__(
+                    'Invalid frontend type for field "%s". Onyl "text" and "label" are allowed.',
+                    $field->descend('label')
+                )
+            );
         }
 
-        $label->setValue($field->value);
-        $label->setBold(!empty($field->bold));
+        $label = new Varien_Data_Form_Element_Label();
+        $label->setValue($field->descend('value'));
+        $label->setBold(!empty($field->descend('bold')));
 
         return $label->getElementHtml();
     }
diff --git a/app/code/core/Mage/Adminhtml/Model/System/Config/Backend/AbstractDate.php b/app/code/core/Mage/Adminhtml/Model/System/Config/Backend/AbstractDate.php
new file mode 100644
index 000000000000..fa389f6838dc
--- /dev/null
+++ b/app/code/core/Mage/Adminhtml/Model/System/Config/Backend/AbstractDate.php
@@ -0,0 +1,92 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * OpenMage
+ *
+ * NOTICE OF LICENSE
+ *
+ * This source file is subject to the Open Software License (OSL 3.0)
+ * that is bundled with this package in the file LICENSE.txt.
+ * It is also available through the world-wide-web at this URL:
+ * http://opensource.org/licenses/osl-3.0.php
+ * If you did not receive a copy of the license and are unable to
+ * obtain it through the world-wide-web, please send an email
+ * to license@magento.com so we can send you a copy immediately.
+ *
+ * @category   Mage
+ * @package    Mage_Adminhtml
+ * @copyright  Copyright (c) 2006-2020 Magento, Inc. (http://www.magento.com)
+ * @copyright  Copyright (c) 2022 The OpenMage Contributors (https://www.openmage.org)
+ * @license    http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
+ */
+
+/**
+ * @category   Mage
+ * @package    Mage_Adminhtml
+ */
+abstract class Mage_Adminhtml_Model_System_Config_Backend_AbstractDate extends Mage_Core_Model_Config_Data
+{
+    /**
+     * @param string $format
+     * @return string
+     */
+    abstract protected function getDateFormat(string $format): string;
+
+    /**
+     * @return $this
+     */
+    protected function _afterLoad()
+    {
+        $value = (string)$this->getValue();
+        if ($value !== '') {
+            $this->setValue($this->getLocale()->date($value)->toString(Varien_Date::DATETIME_INTERNAL_FORMAT));
+        }
+
+        return $this;
+    }
+
+    /**
+     * @return $this
+     */
+    protected function _beforeSave()
+    {
+        $value = (string)$this->getValue();
+        if ($value !== '') {
+            $this->setValue($this->filterDateTime($value));
+        }
+
+        return $this;
+    }
+
+    /**
+     * @param string $date
+     * @return string
+     */
+    protected function filterDateTime(string $date): string
+    {
+        /** @var Mage_Core_Model_Config_Element $field */
+        $field = $this->getFieldConfig();
+
+        $format = Mage_Core_Helper_Date::getDateFormatFromString($field->format->__toString());
+        $format = $this->getDateFormat($format);
+
+        $filterInput = new Zend_Filter_LocalizedToNormalized([
+            'date_format' => $format
+        ]);
+
+        $date = $filterInput->filter($date);
+
+        // convert to utc
+        return $this->getLocale()->utcDate(null, $date, true)->toString(Varien_Date::DATETIME_INTERNAL_FORMAT);
+    }
+
+    /**
+     * @return Mage_Core_Model_Locale
+     */
+    public function getLocale()
+    {
+        return Mage::app()->getLocale();
+    }
+}
diff --git a/app/code/core/Mage/Adminhtml/Model/System/Config/Backend/Date.php b/app/code/core/Mage/Adminhtml/Model/System/Config/Backend/Date.php
index b92877e7d544..61621c48a349 100644
--- a/app/code/core/Mage/Adminhtml/Model/System/Config/Backend/Date.php
+++ b/app/code/core/Mage/Adminhtml/Model/System/Config/Backend/Date.php
@@ -28,86 +28,14 @@
  * @category   Mage
  * @package    Mage_Adminhtml
  */
-class Mage_Adminhtml_Model_System_Config_Backend_Date extends Mage_Core_Model_Config_Data
+class Mage_Adminhtml_Model_System_Config_Backend_Date extends Mage_Adminhtml_Model_System_Config_Backend_AbstractDate
 {
     /**
-     * Output date with time
-     * @var bool
-     */
-    protected $showTime = false;
-
-    /**
-     * @return $this
-     */
-    protected function _afterLoad()
-    {
-        $value = (string)$this->getValue();
-        if ($value !== '') {
-            $this->setValue(Mage::app()->getLocale()->date($value)->toString(Varien_Date::DATETIME_INTERNAL_FORMAT));
-        }
-
-        return $this;
-    }
-
-    /**
-     * @return $this
-     */
-    protected function _beforeSave()
-    {
-        $value = (string)$this->getValue();
-        if ($value !== '') {
-            $this->setValue($this->filterDateTime($value));
-        }
-
-        return $this;
-    }
-
-    /**
-     * @param array|string $value
+     * @param string $format
      * @return string
      */
-    protected function filterDateTime($value): string
+    protected function getDateFormat(string $format): string
     {
-        $field = $this->getFieldConfig();
-        if (!empty($format = $field->format) && defined('Mage_Core_Model_Locale::' . $format)) {
-            $format = constant('Mage_Core_Model_Locale::' . $format);
-        } else {
-            $format = Mage_Core_Model_Locale::FORMAT_TYPE_MEDIUM;
-        }
-
-        $locale = Mage::app()->getLocale();
-
-        // same logic as Mage_Core_Controller_Varien_Action::_filterDates
-        $filterInput = new Zend_Filter_LocalizedToNormalized([
-            'date_format' => $this->showTime ? $locale->getDateTimeFormat($format) : $locale->getDateFormat($format)
-        ]);
-        $filterInternal = new Zend_Filter_NormalizedToLocalized([
-            'date_format' => Varien_Date::DATETIME_INTERNAL_FORMAT
-        ]);
-
-        $value = $filterInput->filter($value);
-        $value = $filterInternal->filter($value);
-
-        // convert to utc
-        return $locale->utcDate(null, $value, true)->toString(Varien_Date::DATETIME_INTERNAL_FORMAT);
-    }
-
-    /**
-     * @return int
-     * @throws Mage_Core_Model_Store_Exception
-     */
-    protected function getStoreId(): int
-    {
-        $storeId = Mage::app()->getRequest()->getParam('store', null);
-        if (!is_null($storeId)) {
-            return (int)Mage::app()->getStore($storeId)->getId();
-        }
-
-        $websiteId = Mage::app()->getRequest()->getParam('website', null);
-        if (!is_null($websiteId)) {
-            return (int)Mage::getModel('core/website')->load($websiteId)->getDefaultStore()->getId();
-        }
-
-        return 0;
+        return $this->getLocale()->getDateFormat($format);
     }
 }
diff --git a/app/code/core/Mage/Adminhtml/Model/System/Config/Backend/Datetime.php b/app/code/core/Mage/Adminhtml/Model/System/Config/Backend/Datetime.php
index 41c99e3b1d2d..99ddf2ea44bd 100644
--- a/app/code/core/Mage/Adminhtml/Model/System/Config/Backend/Datetime.php
+++ b/app/code/core/Mage/Adminhtml/Model/System/Config/Backend/Datetime.php
@@ -28,7 +28,14 @@
  * @category   Mage
  * @package    Mage_Adminhtml
  */
-class Mage_Adminhtml_Model_System_Config_Backend_Datetime extends Mage_Adminhtml_Model_System_Config_Backend_Date
+class Mage_Adminhtml_Model_System_Config_Backend_Datetime extends Mage_Adminhtml_Model_System_Config_Backend_AbstractDate
 {
-    protected $showTime = true;
+    /**
+     * @param string $format
+     * @return string
+     */
+    protected function getDateFormat(string $format): string
+    {
+        return $this->getLocale()->getDateTimeFormat($format);
+    }
 }
diff --git a/app/code/core/Mage/Core/Helper/Date.php b/app/code/core/Mage/Core/Helper/Date.php
new file mode 100644
index 000000000000..45b0cf7633de
--- /dev/null
+++ b/app/code/core/Mage/Core/Helper/Date.php
@@ -0,0 +1,44 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * OpenMage
+ *
+ * NOTICE OF LICENSE
+ *
+ * This source file is subject to the Open Software License (OSL 3.0)
+ * that is bundled with this package in the file LICENSE.txt.
+ * It is also available through the world-wide-web at this URL:
+ * https://opensource.org/licenses/osl-3.0.php
+ * If you did not receive a copy of the license and are unable to
+ * obtain it through the world-wide-web, please send an email
+ * to license@magento.com so we can send you a copy immediately.
+ *
+ * @category   Mage
+ * @package    Mage_Core
+ * @copyright  Copyright (c) 2006-2020 Magento, Inc. (https://www.magento.com)
+ * @copyright  Copyright (c) 2022 The OpenMage Contributors (https://www.openmage.org)
+ * @license    https://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
+ */
+
+/**
+ * Core Cookie helper
+ *
+ * @category   Mage
+ * @package    Mage_Core
+ */
+class Mage_Core_Helper_Date extends Mage_Core_Helper_Abstract
+{
+    /**
+     * @param string $format
+     * @return string
+     */
+    public static function getDateFormatFromString(string $format): string
+    {
+        if ($format && defined('Mage_Core_Model_Locale::' . $format)) {
+            return constant('Mage_Core_Model_Locale::' . $format);
+        }
+        return Mage_Core_Model_Locale::FORMAT_TYPE_MEDIUM;
+    }
+}