If memory serves, that wa from the letter given to frodo at the Prancing Pony, which means it was written, after Gandalf had discovered the writing on the ring and what it really was, so warning Frodo not to use it seems only sensible, likewise, knowing it was the ring and that Sauron was likely to be seeking it, the warning not to travel at night, is afain common sense,a s evil beings were more likely to attack under cover of darkness than in broad daylight, especially if Gandalf suspected that the Nazgul were once more abroad in the world.
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