It always automatically displays the current day. This doc is from December 16th, 1998, as said at the beginning of it and as you can see by the metadata.
Anyway, most of the images in this doc were already posted by a dev here, but there's some new info.
Networked/online multiplayer was planned, with up to four players on an IPX or TCP/IP LAN network. In a simple multiplayer lobby, players would have been able to review potential races, prepare their cars, and issue challenges, taunts, and chat. Custom tracks could be shared via the internet as well.
Game modes besides racing were planned - goal posts and a ball were to allow for football/soccer-esque gameplay (like in this set) and timed gates were to allow for time trial challenges
There were six world themes instead of four, and you were to be able to combine them
There were going to be different modes, starting with assisted/auto steering, and ending with a free driving mode as players advanced in skill
The camera was planned to move in closer to cars during dramatic moments, such as collisions, and the starts/ends of races
Only PC was planned at the time, but future portability was considered possible