I tried to upgrade from 1.7 to 1.9 failed and finally restored old files and DB back. Somehow when modify products then I get red error in backend "Invalid date". The exception log says:
2015-05-27T20:04:07+00:00 ERR (3):
exception 'Mage_Eav_Model_Entity_Attribute_Exception' with message 'Invalid date' in /data08/virt36998/domeenid/www.mysite.com/htdocs/app/code/core/Mage/Core/Model/Config.php:1348
Stack trace:
#0 /data08/virt36998/domeenid/www.mysite.com/htdocs/app/Mage.php(463): Mage_Core_Model_Config->getModelInstance('eav/entity_attr...', 'Invalid date')
#1 /data08/virt36998/domeenid/www.mysite.com/htdocs/app/code/core/Mage/Eav/Model/Entity/Abstract.php(661): Mage::getModel('eav/entity_attr...', 'Invalid date')
#2 /data08/virt36998/domeenid/www.mysite.com/htdocs/app/code/core/Mage/Eav/Model/Entity/Abstract.php(1636): Mage_Eav_Model_Entity_Abstract->walkAttributes('backend/beforeS...', Array)
#3 /data08/virt36998/domeenid/www.mysite.com/htdocs/app/code/core/Mage/Catalog/Model/Resource/Product.php(181): Mage_Eav_Model_Entity_Abstract->_beforeSave(Object(Mage_Catalog_Model_Product))
#4 /data08/virt36998/domeenid/www.mysite.com/htdocs/app/code/core/Mage/Eav/Model/Entity/Abstract.php(1122): Mage_Catalog_Model_Resource_Product->_beforeSave(Object(Mage_Catalog_Model_Product))
#5 /data08/virt36998/domeenid/www.mysite.com/htdocs/app/code/core/Mage/Core/Model/Abstract.php(318): Mage_Eav_Model_Entity_Abstract->save(Object(Mage_Catalog_Model_Product))
#6 /data08/virt36998/domeenid/www.mysite.com/htdocs/app/code/core/Mage/Adminhtml/controllers/Catalog/ProductController.php(714): Mage_Core_Model_Abstract->save()
#7 /data08/virt36998/domeenid/www.mysite.com/htdocs/app/code/core/Mage/Core/Controller/Varien/Action.php(419): Mage_Adminhtml_Catalog_ProductController->saveAction()
#8 /data08/virt36998/domeenid/www.mysite.com/htdocs/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php(250): Mage_Core_Controller_Varien_Action->dispatch('save')
#9 /data08/virt36998/domeenid/www.mysite.com/htdocs/app/code/core/Mage/Core/Controller/Varien/Front.php(176): Mage_Core_Controller_Varien_Router_Standard->match(Object(Mage_Core_Controller_Request_Http))
#10 /data08/virt36998/domeenid/www.mysite.com/htdocs/app/code/core/Mage/Core/Model/App.php(354): Mage_Core_Controller_Varien_Front->dispatch()
#11 /data08/virt36998/domeenid/www.mysite.com/htdocs/app/Mage.php(684): Mage_Core_Model_App->run(Array)
#12 /data08/virt36998/domeenid/www.mysite.com/htdocs/index.php(116): Mage::run('', 'store')
#13 {main}
System log says (I think that this is not the case):
2015-05-27T20:04:08+00:00 ERR (3): Strict Notice: Declaration of Uni_Fileuploader_Block_Adminhtml_Fileuploader_Edit_Tab_Productfile::getRowUrl() should be compatible with Mage_Adminhtml_Block_Widget_Grid::getRowUrl($item) in /data08/virt36998/domeenid/www.mysite.com/htdocs/app/code/community/Uni/Fileuploader/Block/Adminhtml/Fileuploader/Edit/Tab/Prod... on line 9
