I found out that for PS4 version of Final Fantasy XIV, there is a night time music for Coerthas Central Highlands. It is actual Final Fantasy XIV: A Realm Reborn music, as it was used in a promotional video by Square Enix for the tour of Eorzea. Is there a way to enable that music for the PC version?

This is an example of the point where the day music is going to change to night music, no apparent hacking:
https://www.youtube.com/watch?v=nSKsMnW03KI#t=266

This is the same example of the night music itself:
https://www.youtube.com/watch?v=nSKsMnW03KI#t=273

This is the promotional video, FINAL FANTASY XIV: A Realm Reborn - A Tour of Eorzea, Part 1, with the very music in play.
https://www.youtube.com/watch?v=f0CPRyV7yNw#t=373