Does anyone know of any way you can keep Night Shift on at all times on iOS or MacOS? It seems when I turn on Night Shift, it automatically turns off next morni

Does anyone know of any way you can keep Night Shift on at all times on iOS or MacOS? It seems when I turn on Night Shift, it automatically turns off next morning when it's daylight time. I think the same things applies to f.lux on MacOS. I would like for it to be at 1200K at all times but I guess that's not doable and it grinds my ears a bit because you can't do so.