Call to a member function format() on string

$time = \DateTime::createFromFormat('Y-m-d H:i:s',$estimatedTime);$order->setEstimatedTime($time);

/** * @return \DateTime */public function getEstimatedTime(){    return $this->estimatedTime;}/** * @param \DateTime $estimatedTime */public function setEstimatedTime($estimatedTime){    $this->estimatedTime = $estimatedTime;}