Not sure about the color filter thing, but I can schedule Night Shift under Settings —> Display & Brightness. Manually set it for a specific time or schedule it to adjust automatically at sunrise and sunset. https://m.primal.net/QZMo.png https://m.primal.net/QZMp.png

I turn it on myself lol hit the lock button on an iPhone 3x

Shortcuts app. Create an automation that triggers based on time. You can even choose sunset and sunrise. Are you not using automations yet? https://i.nostr.build/pZnJetplRXTtd9wU.jpg https://i.nostr.build/h9X4l4uwJiGycA2K.jpg