The thing about measuring time applies to characters (character's experience), not players (player's experience). The characters in a book cannot read the book's cover or the book itself. This information is outside of their realm - even though it is all about their realm. Likewise, our planeshift characters cannot see the time on the screen, or the name tags that hover above other character's heads.
Roleplayers tend to focus more on details like this.
In the past, there was a noticable difference between day and night (player's experience), but for some, the screen got too dark to view so this was turned off.
So far, in the Unreal branch of the game, there is a sun in the sky, so a sundial around the statue of laanx might be theoretically possible :p. ( That might not jibe too well with the game's story, though)
Rigwyn would certainly approve of and encourage such a mockery.