src/Page/VariableTrait.php
public function setVariable($name, $value)
    {
        switch ($name) {
            case 'date':
                try {
                    if ($value instanceof \DateTime) {
                        $this->offsetSet('date', $value);
                    } else {
                        if (is_numeric($value)) {
                            $this->offsetSet('date', (new \DateTime())->setTimestamp($value));
                        } else {
                            if (is_string($value)) {
                                $this->offsetSet('date', new \DateTime($value));
                            }
                        }
                    }
                } catch (Exception $e) {
                    throw new Exception(sprintf("Expected date string in page ID: '%s'", $this->getId()));
                }
                break;
            case 'draft':
                if ($value === true) {
                    $this->offsetSet('published', false);
                }
                break;
            default:
                $this->offsetSet($name, $value);
        }

        return $this;
    }
public function setVariable($name, $value)
    {
        switch ($name) {
            case 'date':
                try {
                    if ($value instanceof \DateTime) {
                        $this->offsetSet('date', $value);
                    } else {
                        if (is_numeric($value)) {
                            $this->offsetSet('date', (new \DateTime())->setTimestamp($value));
                        } else {
                            if (is_string($value)) {
                                $this->offsetSet('date', new \DateTime($value));
                            }
                        }
                    }
                } catch (Exception $e) {
                    throw new Exception(sprintf("Expected date string in page ID: '%s'", $this->getId()));
                }
                break;
            case 'draft':
                if ($value === true) {
                    $this->offsetSet('published', false);
                }
                break;
            default:
                $this->offsetSet($name, $value);
        }

        return $this;
    }
Set a variable.

@param $name
@param $value

@throws Exception

@return $this