CalculateParams::__construct

public function __construct(
	?DateTime $deadline,
	?int $notifyType,
	?int $notifyValue,
	?array $offsets
)
{
	$this->deadline = $deadline ? clone $deadline : null; // prevent unexpected changes by reference
	$this->notifyType = $notifyType;
	$this->notifyValue = $notifyValue;
	$this->offsets = $offsets;
}