private function getFormattedTimestamp($dateTime)
    {
        if(!$dateTime instanceof DateTime) {
            $dateTime = new DateTime($dateTime);
        }
        return $dateTime->format(DATE_ISO8601);
    }
private function getFormattedTimestamp($dateTime)
    {
        if(!$dateTime instanceof DateTime) {
            $dateTime = new DateTime($dateTime);
        }
        return $dateTime->format(DATE_ISO8601);
    }
private function getFormattedTimestamp ( $ dateTime ) { if ( ! $ dateTime instanceof DateTime ) { $ dateTime = new DateTime ( $ dateTime ) ; } return $ dateTime -> format ( DATE_ISO8601 ) ; }
Returns a ISO 8601 formatted string from a DateTime instance.
@param DateTime|string $dateTime
@return string
Returns a ISO 8601 formatted string from a DateTime instance .