The nights are getting so long in Stockholm that Mojang have all long forgotten what the sun looks like. It's square, right? Anyway, at least navigating Minecraft at night should be easier now they've added lanterns!
Mojang are trying to finalize 1.13.1 and get it to you as soon as possible. They're pretty happy with where 1.13.1 stands now, and are aiming to get the full release out next week unless some major bug pops up.