This article is from the Stardates in Star Trek FAQ, by Andrew Main zefram@dcs.warwick.ac.uk with numerous contributions by others.
It has been suggested, in jest, that stardates are actually hexadecimal, and
that it is merely coincidence that only decimal digits have been heard so far.
This is worth mentioning, in order to point out that this FAQ proceeds on the
basis that all stardates are specified in decimal.
It is interesting to note, however, that the distribution of digits is far
from uniform. A canonical stardate ending in ".8" is a real rarity, though
not totally unknown. The distribution of single decimal digit fractional
parts, according to the most up-to-date episode list I can get at the time of
writing, is thus:
Digit Occurrences Proportion 0 8 2.34% 1 54 15.79% 2 73 21.34% 3 58 16.96% 4 48 14.04% 5 34 9.94% 6 17 4.97% 7 28 8.19% 8 6 1.75% 9 16 4.68% Total 342 100.00%
 
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