How did they create clocks for Oculus Home? How would I make my own design with the time visible?

I understand that Oculus Home objects are gITF and I have previously scripted some stuff to convert OBJ to gITF and successfully imported them into Oculus Home (I'm a business app dev normally, beginner game dev).  I'm new to these file formats, though, and can't figure out how Oculus developers created clock objects for Home that work as real clocks.  It seems like all the animations I usually see are simple loops, not code-involved "display the current time" type stuff.  How did they do that?  How could I provide my own model and visual design but produce a working clock?  Thanks!