Sky went out / sky is unlit during day.

When I started minecraft, the sky was flickering strangely. I'm in a dry area, but suspected lightning from nearby areas. It was constant for a couple minutes, and annoying, so I went underground. When I came back up, the flickering was gone and the sky was fairly dark with no stars. I assumed it was night. I looked outside later and the sky was black and starless. Now it's daytime - burning zombies - and the sky is not right for day, even cloudy day doesn't look like this. I don't get the pool of light around the lit tower like nighttime has, and I can see the landscape better than at night. The sky looks like it's been turned off.