To create day and night in Flock XR you could use the light intensity block or use two sky blocks.
How do I use the light intensity block for day and night?
From Scene choose effects and drag in the light intensity block
The number 1 is where you choose the intensity of the light. 1 is very bright and 0 is completely dark.
Changing the color and ground colours will give you different lighting effects
You could use a forever loop with two for each loops to simulate the changes from day to night
By changing the by and the wait values you can make the timings more realistic
How do I use the sky block for day and night?
The sky block can be added multiple times to your scene
You could use a forever loop and wait blocks to switch between day and night