This article is from the Stardates in Star Trek FAQ, by Andrew Main zefram@dcs.warwick.ac.uk with numerous contributions by others.
Objection: in the seventh season ST:TNG episode "Dark Page" (SD 47254.1),
Lwaxana Troi's personal log entries for stardates in the 30000s were seen.
These were described without hesitation as being from 35 years previous. This
makes each year about 500 units. Of course, these could have been Betazoid
years.
The Revised Chronology explains that the correct stardates -- around 05000 for
the dates 42 years ago -- would have risked confusion with ST:TOS stardates.
They therefore ignored the logical system, and caused even more confusion.
 
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