The clock at my house in Littleroot town appears to be stuck at 10:31 pm. Can I fix this?
Question: After you start up the game, does it tell you that the battery has run dry? That timed events won't occur anymore? Then the only thing that you can do is fix the battery by replacing it. I'm not 100% sure what it does to your save file, though. If it doesn't say that and your time is still,then it could mean the same thing.
Here's a tutorial that I used to fix my own Emerald Version: http://m.imgur.com/a/pSq8B