initial time setting for 3D tiles

[imakihi]

Hi there.
I want to control an initial 3D Tiles building appearance by controlling initial date and time. For example, when I open my test Terria app with building data at night time, all buildings look dark. So I am looking for a way to set an initial time.

I create a CSV file with a time column to imitate this effect using initialTimeSource and startTime options but I don't want to load the file every time I load building data...

Any ideas??

Thank you in advance.

Hiroo