Entity/OrderElement.php
public function setBeginAt(\dateTime $beginAt = null)
    {
        $this->beginAt = $beginAt;
        $this->timeInterval();

        return $this;
    }
public function setBeginAt(\dateTime $beginAt = null)
    {
        $this->beginAt = $beginAt;
        $this->timeInterval();

        return $this;
    }
Set beginAt

@param \dateTime $beginAt
@return OrderElement