PHP – Fix Wrong Date Display Issue

I'm not sure if this is the best solution, but I think it should work:

Add a custom renderer to the textfield that will format the date:

$renderer = $this->getLayout()->createBlock('foo/widget_grid_renderer_date');
$fieldset->addField('end_date', 'text', array(
            'label'     => Mage::helper('survey')->__('End Date'),
            'index'     => 'end_date',
            'name'      => 'end_date',
            'class'     => 'readonly',
            'readonly'  => true
      )
    )->setRenderer($renderer);

Create a new renderer class:

class Example_Foo_Block_Widget_Grid_Renderer_Date extends Mage_Adminhtml_Block_Template 
    implements Varien_Data_Form_Element_Renderer_Interface
{

    public function render() {

        //...
        return Mage::getSingleton('core/locale')
                        ->date($data, Zend_Date::ISO_8601, null, false)->toString($format);     
    }
}

instead of

$currentTimestamp = Mage::getModel('core/date')->timestamp(time());

use this:

$currentTimestamp = Mage::getModel('core/date')->timestamp(time() + 2 * 24 * 60 * 60);