public function getTicketSaleStartDate()
    {
        $saleStart = null;
        if (($tickets = $this->owner->Tickets())) {
            /** @var Ticket $ticket */
            foreach ($tickets as $ticket) {
                if (($date = $ticket->getAvailableFrom()) && strtotime($date) < strtotime($saleStart) || $saleStart === null) {
                    $saleStart = $date;
                }
            }
        }

        return $saleStart;
    }
public function getTicketSaleStartDate()
    {
        $saleStart = null;
        if (($tickets = $this->owner->Tickets())) {
            /** @var Ticket $ticket */
            foreach ($tickets as $ticket) {
                if (($date = $ticket->getAvailableFrom()) && strtotime($date) < strtotime($saleStart) || $saleStart === null) {
                    $saleStart = $date;
                }
            }
        }

        return $saleStart;
    }
public function getTicketSaleStartDate ( ) { $ saleStart = null ; if ( ( $ tickets = $ this -> owner -> Tickets ( ) ) ) { /** @var Ticket $ticket */ foreach ( $ tickets as $ ticket ) { if ( ( $ date = $ ticket -> getAvailableFrom ( ) ) && strtotime ( $ date ) < strtotime ( $ saleStart ) || $ saleStart === null ) { $ saleStart = $ date ; } } } return $ saleStart ; }
get The sale start date

@return \SS_DateTime
get The sale start date