Made a blueprint that controls the day & night cycle. I can enter a current time (0 to 24) and speed. The video is showing a speed of 20 minutes per second.
Wanted to show off the progress so far. I’m just playing around for fun. 
Added a way to fast forward to a specific time. Also played around with replication. Server can adjust time and speed.
Interesting. I am currently using this free asset: UE4 - Day and night cycle (Download Free!) - YouTube (i am there in comments, with link where i have that implemented too).
Could your solution be with certain advantages? Thank you.