Magento custom module date field saving date to one day before the selected date

Question

i followed steps on this link to add a date field to my custom module :

http://magentomechanic.blogspot.com/2010/01/to-add-custom-date-field-in-custom.html

Every

Answer 1

$preSaleDate = $_product->getAvailabilityDate();//product attribute

if($preSaleDate) {
  $format = 'Y-m-d H:i:s'; //current format
  $formatted_date = DateTime::createFromFormat($format, $preSaleDate)->format('m/d/Y');
  $dateReal = Mage::app()->getLocale()->date($formatted_date
                                                  ,Zend_Date::DATE_SHORT, null, false);
  $format = 'long'; // short, long, medium, full
  $dueDate = Mage::helper('core')->formatDate($dateReal, $format, false);

  echo $dueDate;// will get same day as original $preSaleDate
}