DateTime::__wakeup DateTimeImmutable::__wakeup DateTimeInterface::__wakeup The __wakeup handler &reftitle.description; public DateTime::__wakeup public DateTimeImmutable::__wakeup public DateTimeInterface::__wakeup The __wakeup() handler. &reftitle.parameters; &no.function.parameters; &reftitle.returnvalues; Initializes a DateTime object.