2 Options that seem easiest, as there is no real mods that I have ever seen that have a no night thing.
1. Get (I think it was) LOLEditor, and when its nighttime, close the game, and edit the value in it to be day. You would probably need a more in depth explanation but the second option is easier.
2. Build a bed. Night comes? Sleep in it. It switches the game to morning when you wake up.