God Mode: The Date Modifier

Modern-day unlucky gamer Aiden Gu transmigrates to a fantasy world and obtains a system that can modify production dates. From then on, he embarks on a god-mode path of unlimited modifications. Seemingly honest and ordinary, and a perennial underachiever, he can instantly kill numerous peerless geniuses with a flick of his finger, a classic example of 'playing the pig to eat the tiger' in the world of cultivation. In the end, he reigns supreme over all ages.