I've been noticing the time change, too. It's dark a lot earlier now, and light later, as you say.
It does make it difficult to keep up with outdoor time. Is Charlie more active as ball throwing is less?
I shudder to think of Krypto up from morning until night without a nap. My experience is that pups need to take their naps, or else they are not good citizens! lol! As he gets older it won't be an issue.
Love All Life, Thank You For Posting! :)