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What? While it is true that a moon will almost always have day/night cycle when tidally locked to a planet, a planet that is tidally locked to a star won't. It will have a perpetual day side and a perpetual night side. It is locked to the light source, not rotating (in most cases).
You might be able to find an example in theory of a moon that is tidally locked to a planet that is also tidally locked to a star, meaning it could be always night if it's locked to the night side or have perpetual day/night sides like it's planet. Likewise you might be able to find a planet that is tidally locked to a star AND also rotating on it's poles.
It may even be possible that we could find a planet that is tidally locked or rotating in a binary star system between the two stars and it would experience perpetual days. We already know of dark planets, those that have been thrown out of their orbits and are travelling though space in perpetual darkness.