( In addition, Star Trek Fact Check shows a scripted narration from the same draft containing "star date 1312.6".This became "star date 1312.4" by the final revised draft (July 8, 1965), which also asks for "C-1277.1 to 1313.7" to appear on Kirk's gravestone. (Page 65, Scene 175) – We presume dates are in days, Kirk would only be 36 days old. For Kirk’s birth date in Julian system figure would be in millions. On the other hand, the letter "C" and the rate of increase in the script suggest that 1277.1 was intended to be the date Kirk was promoted to captain and/or assumed command of the Enterprise, not his date of birth. Replying to a newsgroup question on stardates, Engel quoted information from his book: "For the starship captain's log entry narrations, Roddenberry wanted to devise a futuristic measurement of time reference.He called (Sam) Peeples (whom Roddenberry had contacted early on for help in learning about science fiction, a subject he knew nothing about; it was Peeples who wrote "Where No Man Has Gone Before," the pilot that sold ST).So we got this script, and the script originally had dates in it, like 2362, and months and days.I felt that that sounded a little awkward for the 23rd, 22nd century, so I thought that there should be another, another dating system.
Each percentage point (sic) is roughly equivalent to one-tenth of one day.We invented "Stardate" to avoid continually mentioning Star Trek's century (actually, about two hundred years from now), and getting into arguments about whether this or that would have developed by then.Pick any combination of four numbers plus a percentage point, use it as your story's stardate.( In an alternate timeline that diverged from the prime timeline in 2344, the term combat date had replaced the term stardate in the dating system used by Starfleet by 2366.The term was used during the Federation-Klingon War of that timeline.
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What is called a "percentage point" is actually the tenths digit.