A stardate is a fictional system of time measurement developed for the television and film series Star Trek.In the series, use of this date system is commonly heard at the beginning of a voice-over log entry, such as "Captain's log, stardate 41153.7. While the general idea resembles the Julian date currently used by astronomers, writers and producers have selected numbers using different methods over the years, some more arbitrary than others.Stardates are a mathematical formula which varies depending on location in the galaxy, velocity of travel, and other factors, can vary widely from episode to episode.
Stardates of Star Trek: Deep Space Nine began with 46379.1, corresponding to the sixth season of Star Trek: The Next Generation which was also set in the year 2369.
Each percentage point is roughly equivalent to one-tenth of one day.
The progression of stardates in script should remain constant but don't worry about whether or not there is a progression from other scripts.
In the various TV series, four-digit stardates have been read out in groups of two digits as well as digit-by-digit, whereas only the latter pronunciation has been used with five-digit stardates.
For example, stardate 1312.4 can be pronounced "thirteen-twelve point four" as well as "one-three-one-two point four", but stardate 43989.1 is pronounced "four-three-nine-eight-nine point one".