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For the radio program, see StarDate (radio program).

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 voiceover log entry such as "Captain's log, stardate 41153.7. Our destination is planet Deneb IV..." While the general idea resembles the Julian day[1][2] currently used by astronomers, writers and producers have selected numbers using different methods over the years, some more arbitrary than others. This makes it impossible to convert all stardates into equivalent calendar dates, especially since stardates were originally intended to disguise the precise era of Star Trek.

The Original Series era[edit]

The following excerpt from Star Trek Guide (April 17, 1967, p. 25) instructs writers for the original Star Trek TV series on how to select stardates for their scripts:[3]

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. For example, 1313.5 is twelve o'clock noon of one day and 1314.5 would be noon of the next day. Each percentage point is roughly equivalent to one-tenth of one day. The progression of stardates in your script should remain constant but don't worry about whether or not there is a progression from other scripts. 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.

(The "percentage point" mentioned was in practice a single decimal.) The official timeline[4] places the original series between the years 2265 and 2269, with the second pilot beginning on stardate 1312.4 and the last-produced episode on stardate 5928.5; however, this timeline is based on references in Star Trek: The Next Generation, and had not been developed during the production of the original series. Despite the guideline to "pick any combination", the list of episodes shows stardates increasing with time in general, albeit with many instances of a number being lower than in the preceding episode.

The Next Generation era[edit]

Stardates were revised from the above description for Star Trek: The Next Generation and all the subsequent shows and movies set in the same era. They were described as follows in Star Trek: The Next Generation Writer's/Director's Guide of March 23, 1987 (p. 13):

A stardate is a five-digit number followed by a decimal point and one more digit. Example: "41254.7." The first two digits of the stardate are always "41." The 4 stands for 24th century, the 1 indicates first season. The additional three leading digits will progress unevenly during the course of the season from 000 to 999. The digit following the decimal point is generally regarded as a day counter.

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. Star Trek: Voyager began with stardate 48315.6 (2371), one season after TNG had finished its seventh and final season. As in TNG, the second digit would increase by one every season, while the initial two digits eventually rolled over from 49 to 50, despite the year 2373 still being in the 24th century. Star Trek: Nemesis was set around stardate 56844.9.

Star Trek (2009)[edit]

According to Roberto Orci, stardates were revised again for the 2009 film Star Trek so that the first four digits correspond to the year, while the remainder was intended to stand for the day of the year.[5][6][7] For example, stardate 2233.04 would be January 4, 2233. Star Trek Into Darkness begins on stardate 2259.55, or February 24, 2259.[8]

Star Trek Online[edit]

The MMORPG Star Trek Online (STO) was launched in 2009 and began on stardate 86088.58, in the year 2409.[9]


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".

See also[edit]


  1. ^ Lee Anne Nicholson, ed. (1996). Star Trek 30 Years Special Collector's Edition. Paramount Pictures. 
  2. ^ Robert H. Justman, Herbert F. Solow (writers), Kellam de Forest (source) (1998). Inside Star Trek: The Real Story (Videotape). 24 minutes in. Retrieved February 8, 2014. 
  3. ^ Onion, Rebecca. "Pages from the Official Star Trek Writers' Guide, 1967". Slate magazine. The Slate Group. Retrieved 15 May 2013. 
  4. ^ Okuda, Mike; Okuda, Denise (1993). Star Trek Chronology: The History of the Future. Pocket Books. ISBN 0-671-79611-9. 
  5. ^ "Roberto Orci's stardate comment". 
  6. ^ "Roberto Orci's Q&A entry on stardates". 
  7. ^ Orci, Roberto (May 14, 2010). "star". Twitter. Retrieved June 27, 2011. 
  8. ^ "Analysis Of Star Trek Into Darkness IMAX Extended Preview...". 
  9. ^ "About Start Trek Online". sto.perfectworld.com. Perfect World Entertainment Inc. 2014. Retrieved 1 February 2014. "Set in 2409, Star Trek Online exists [...]" 

External links[edit]

Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Stardate — Please support Wikipedia.
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736 news items

CBS Local

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CBS Local

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Stardate 2016: It's the near future, and one of America's most beloved science fiction icons is celebrating a major milestone. Phasers on stun: Star Trek is turning 50. Back here in 2014, that event seems almost light years away, but it's never too ...

High-Def Digest (blog)

High-Def Digest (blog)
Tue, 22 Jul 2014 11:56:15 -0700

Stardate, Wednesday O-something hours. We are headed to Costa Rica to find Dr. Scott some monkeys… Uh, I mean Nicaragua because the river to Costa Rica is bad, but we're gonna go up that river anyway. I dunno, it's all very confusing.” FAST BOATS!


Fri, 04 Jul 2014 04:26:15 -0700

Im September letzten Jahres, genau am 05.09.2013, veröffentlichte Paramount Home Entertainment die Star Trek: Stardate Collection und erfüllte damit wohl zahlreichen Fans einen langersehnten Wunsch. Denn jenes Set enthältinsgesamt 12 Discs mit allen ...

Businessweek (blog)

Businessweek (blog)
Thu, 03 Jul 2014 15:07:30 -0700

Stardate: 2014. As Star Trek nears its 50th anniversary, most of its imagined technologies remain light years away. But several startups and research projects claim they can approximate the functions of the tricorder, that handheld device used to ...
Live in Limbo
Mon, 07 Jul 2014 13:04:59 -0700

With the minimal lighting the band took advantage of their eerie stylings and played some of their spoken word pieces like “Stardate” which is narrated by actor Joseph Gordon-Levitt. Rapper Del The Funk Homosapien who is known for his odd lyrics and ...

Montreal Gazette

Montreal Gazette
Sun, 06 Jul 2014 20:34:25 -0700

Stardate offered more conceptual narrative. Dan the Automator took the mic to proclaim “Man, I f---in' love Montreal,” and intro the grindingly funky Nobody Can and a new level of stage lighting (which was terrific throughout) in gold and red. Melding ...

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