In the last episode of the first season, the year is firmly established by Data, as 2364. This marked the first time an explicit future calendar date had been attached to a "Star Trek" storyline, and allowed fans and writers to extrapolate further dates. For example, the established date implies McCoy was born around 2227, ruling out the "Spaceflight Chronology"-derived dating of the original series to the early 23rd century (though the dating had already been effectively overruled by "Star Trek IV", which primarily takes place in 1986, where Kirk tells Gillian Taylor that he is from the late 23rd Century, though he does not give an exact date).