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As romanda said a YYYYMMDD.HH(mm) would be the best format to use. As for books which jump around the timeline, you could just assign them the stardate the over begining date (i.e. the book starts 2686 jumps to 2675 then to 2690 you could assign it 2675MMDD.HHmm).
As for what to put on the cover, I agree less is more. Simply putting the year on the cover/spine should be enough. You could place the complete number in the front or back page along with the most up-to-date (at time of print) timeline and a webpage to the visit to get the most current timeline.

