Changing it to nighttime all the time

[LoneWanderer1987]

Just want to know you keep it the sky night time with out it changing into day time

[ashtonlp101]

Essentially what you'd have to do is edit the climate and weather data of all the playable worldspaces (which is over 10 with DLCs because the game is sectioned off for larger areas like the strip). There is a slider bar that determines times of day in which certain color schemes function in the sky. You can mess around with that and see what you can do. You could also write a script that checks the time constantly and whenever the sun begins to rise (I think 5 AM in Vanilla NV) you could use ForceWeather or something along those lines to change it back to a darker setting. I personally recommend the former because scripting can quickly become a messy nightmare if not implemented perfectly in most cases.