Stardates and Calendar Dates
Por TrekGuide.com.
Note: The following Stardate calculations are meant to express general trends across all episodes of each Star Trek series. These calculations are not meant to be accurate for small time scales, such as hours or minutes within a single episode.
Note: The calculators on this page are designed to work only with JavaScriptenabled Web browsers. The calculators may not function in other Web browsers. Please make sure your Web browser is JavaScriptenabled before continuing.
.
 Expressing Contemporary Dates as Stardates (Today is Stardate 67037)
 Twentyfourth Century Stardates (TNG, DS9, Voyager)
 TNG Stardate Calculator
 Twentythird Century Stardates (The Original Series)
 TOS Stardate Calculator
 Late Twentythird Century Stardates (The Movie Series)
 Star Trek XI Stardates
 Stardate Inconsistencies
 Other useful date calculators:
Expressing Contemporary Dates as Stardates
Find the fictional Stardate that corresponds to “today’s” date
Since the Stardate systems used in various Star Trek episodes are meant to measure time in the Twentythird and Twentyfourth Centuries, the same Stardate system cannot be used to express contemporary dates (i.e., in the Twentieth and Twentyfirst Centuries).
However, for those who would like to create Stardates to represent contemporary dates, there are three methods that can be used:
 Represent the current date in YYMM.DD format, where “YY” is the current year minus 1900, MM is the current month (0112), and DD is the current day of the month (0131).For example, September 08, 1966, would be written as “Stardate 6609.08” in the YYMM.DD format. Another digit must be added for years after 1999, such that September 11, 2001, would be written as “Stardate 10109.11” in the YYMM.DD format. This system can be used to express any year after 1900 in Stardate format.This system also roughly corresponds to the Stardates used in the first six Star Trek motion pictures, such that if a new movie were made today in The Original Series continuity, then its Stardate would be close to the YYMM.DD format.
 Using the new Stardate format in Star Trek XI, dates may be expressed in YYYY.xx format, where YYYY is the actual fourdigit year, and .xx represents the fraction of the year to two decimal places (i.e., hundredths of a year). For example, January 1, 1999, would correspond to Stardate 1999.00, while July 2, 1999, would correspond to Stardate 1999.50 (halfway through the year 1999).For any given date, simply calculate the number of days it has been since January 1, then express that as a percentage of the year (the number of days since January 1 divided by 365 should give the number to follow the decimal in the Stardate).
 Use the Stardate of the current Star Trek episode or movie to represent today’s Stardate. Today is Stardate 67037, using The Next Generation Stardate system (i.e., that would be the Stardate of this week’s episode if The Next Generation and its spinoffs were still in production).
Twentyfourth Century Stardates
Calculating calendar dates in The Next Generation, Deep Space Nine, and Voyager
While there have been very few references to actual dates in more than 700 episodes of Star Trek, it is possible to derive a fairly accurate correlation between the fictional Stardate system and calendar dates inThe Next Generation, Deep Space Nine, and Voyager, based on facts from actual episodes and somecalendar math.
Facts:
Fact: The Next Generation episode “The Neutral Zone,” with a Stardate of 41986.0, gave the calendar year as 2364 at the end of the first season.
Fact: The Next Generation episode “Data’s Day” took place during the Hindu Festival of Lights. The episode aired the week of January 9, 1991 (two and a half years after “The Neutral Zone”), with a Stardate of 44390.1.
Fact: Diwali, the fiveday Festival of Lights, starts on the New Moon ending the month of Asvina on the Hindu calendar, which typically is the date of the New Moon in India nearest to Halloween.
Fact: According to the Calendar Mine 2.0 perpetual calendar, November 3 is the date of the New Moon and the start of Diwali in the year 2366 on Earth. Therefore, the Hindu Festival of Lights would be celebrated in a fiveday period starting on November 3, 2366, and ending on November 7, 2366, so Stardate 44390.1 must be within that date span.
Fact: The Next Generation episode “Data’s Day” also states that Stardate 44390.1 is the 1,550th day since the U.S.S. Enterprise was commissioned.
Fact: In The Next Generation episode “All Good Things…” Picard states that he first met Q seven years before Stardate 47988. Their first meeting was depicted on Stardate 41153.7 in “ENCOUNTER AT FARPOINT.”
Fact: In the Voyager episode “EYE OF THE NEEDLE,” Commander Chakotay states that the current year is 2371, with a Stardate of 48579.4.
Fact: The Voyager episode “THE 37’s” gave the calendar year as 2371 at the beginning of the second season, with a Stardate of 48975.1.
Fact: In the Voyager episode “FUTURE’S END,” information downloaded from the U.S.S. Voyager‘s computer indicates that the Voyager was launched in the year 2371. The first episode of Voyager,“CARETAKER,” took place on Stardate 48315.6.
Fact: The date for the Voyager episode “11:59” was given as April 22, 2375. (No Stardate was given in the episode, but episodes airing before and after it had Stardates of 52647 and 52861.274.)
Fact: The movie STAR TREK: FIRST CONTACT showed that humans made first contact with Vulcans on April 5, 2063.
Fact: In the Voyager episode “HOMESTEAD,” the crew is celebrating the 315th anniversary of First Contact Day. The following day, a captain’s log is recorded on Stardate 54868.6.
Fact: An average Earth year comprises about 365.2422 mean solar days.
Calculations:
Given the above facts, a consistent Stardate system must incorporate the following dates:
 Stardate 41986.0 must be in the year 2364 (“The Neutral Zone”).
 Stardate 44390.1 must be between November 3, 2366, and November 7, 2366 (“Data’s Day”).
 Stardate 47988 takes place seven years after Stardate 41153.7 (“ENCOUNTER AT FARPOINT,” “All Good Things…”).
 Stardate 48315.6 must be in the year 2371 (“FUTURE’S END,” “CARETAKER”).
 Stardate 48579.4 must be in the year 2371 (“EYE OF THE NEEDLE”).
 Stardate 48975.1 must be in the year 2371 (“THE 37’s”).
 April 22, 2375, takes place between Stardates 52647 and 52861.274 (assuming the episodes before and after “11:59” were in chronological order).
 Stardate 54868.6 is the day after First Contact Day, the 315th anniversary of April 5, 2063 (“HOMESTEAD,”).
Since The Next Generation episode “Data’s Day” and the Voyager episode “HOMESTEAD” both make references to holidays with known dates, these two episodes can be used to establish a Stardatetotime ratio.
However, “Data’s Day” (with a Stardate of 44390.1) could take place any time from November 3, 2366, to November 7, 2366, and it is unclear whether “HOMESTEAD” (with a Stardate 54868.6) takes place in the year 2378 or 2377, so that leaves a window of four possible calendar date spans for a definite span of 10478.5 Stardates. (54868.6  44390.1 = 10478.5 Stardates)
 If “Data’s Day” took place on November 3, 2366, and “HOMESTEAD” took place on April 6, 2378, then that would give a span of 4,172 days.
 If “Data’s Day” took place on November 7, 2366, and “HOMESTEAD” took place on April 6, 2378, then that would give a span of 4,168 days.
 If “Data’s Day” took place on November 3, 2366, and “HOMESTEAD” took place on April 6, 2377, then that would give a span of 3,807 days.
 If “Data’s Day” took place on November 7, 2366, and “HOMESTEAD” took place on April 6, 2377, then that would give a span of 3,803 days.
Given the four possible date spans above, that leaves four possible Stardatetotime ratios:
 4,172 days = 10478.5 Stardates, giving a ratio of 0.39814859 day per Stardate,(4,172 days / 10478.5 Stardates = 0.39814859 day/Stardate)
which gives a ratio of 917.351484 Stardates/year.(365.2422 days per year / 0.39814859 day per Stardate = 917.351484 Stardates/year) 4,168 days = 10478.5 Stardates, giving a ratio of 0.397766856 day per Stardate,(4,168 days / 10478.5 Stardates = 0.397766856 day/Stardate)
which gives a ratio of 918.23186 Stardates/year.(365.2422 days per year / 0.397766856 day per Stardate = 918.23186 Stardates/year) 3,807 days = 10478.5 Stardates, giving a ratio of 0.36331536 day per Stardate,(3,807 days / 10478.5 Stardates = 0.36331536 day/Stardate)
which gives a ratio of 1005.30349 Stardates/year.(365.2422 days per year / 0.36331536 day per Stardate = 1005.30349 Stardates/year) 3,803 days = 10478.5 Stardates, giving a ratio of 0.362933626 day per Stardate,(3,803 days / 10478.5 Stardates = 0.362933626 day/Stardate)
which gives a ratio of 1006.36087 Stardates/year.(365.2422 days per year / 0.362933626 day per Stardate = 1006.36087 Stardates/year)If we apply each of the four possible Stardate ratios above to the known fact of the Voyager‘s launch date in 2371, then we get the following results:
 Using the lowest possible Stardatetoyear ratio, 917.351484 Stardates/year, that would mean that the launch of the Voyager on Stardate 48315.6 (“CARETAKER”) would be 6553.0 Stardates before April 6, 2378 (“HOMESTEAD”), which had a Stardate of 54868.6,(54868.6  48315.6 = 6553.0)
which would be 2,609.06771 days before April 6, 2378,(0.39814859 day per Stardate x 6553.0 Stardates = 2,609.06771 days)
which would mean that “CARETAKER” took place on February 13, 2371. This fits with the fact that theVoyager was launched in 2371 (“FUTURE’S END”). Using the secondlowest possible Stardatetoyear ratio, 918.23186 Stardates/year, that would mean that the launch of the Voyager on Stardate 48315.6 (“CARETAKER”) would be 6553.0 Stardates before April 6, 2378 (“HOMESTEAD”), which had a Stardate of 54868.6,(54868.6  48315.6 = 6553.0)
which would be 2,606.56621 days before April 6, 2378,(0.397766856 day per Stardate x 6553.0 Stardates = 2,606.56621 days)
which would mean that “CARETAKER” took place on February 16, 2371. This fits with the fact that theVoyager was launched in 2371 (“FUTURE’S END”). Using the secondhighest possible Stardatetoyear ratio, 1005.30349 Stardates/year, that would mean that the launch of the Voyager on Stardate 48315.6 (“CARETAKER”) would be 6553.0 Stardates before April 6, 2377 (“HOMESTEAD”), which had a Stardate of 54868.6,(54868.6  48315.6 = 6553.0)
which would be 2,380.80555 days before April 6, 2377,(0.36331536 day per Stardate x 6553.0 Stardates = 2,380.80555 days)
which would mean that “CARETAKER” took place on September 30, 2370. This does not fit with the fact that the Voyager was launched in 2371 (“FUTURE’S END”). Using the highest possible Stardatetoyear ratio, 1006.36087 Stardates/year, that would mean that the launch of the Voyager on Stardate 48315.6 (“CARETAKER”) would be 6553.0 Stardates before April 6, 2377 (“HOMESTEAD”), which had a Stardate of 54868.6,(54868.6  48315.6 = 6553.0)
which would be 2,378.30405 days before April 6, 2377,(0.362933626 day per Stardate x 6553.0 Stardates = 2,378.30405 days)
which would mean that “CARETAKER” took place on October 2, 2370. This does not fit with the fact that the Voyager was launched in 2371 (“FUTURE’S END”).Given the above results, we can discard possibilities 3 and 4, since they do not fit with a Voyager launch date of 2371. Since these were the only two options in which the episode “HOMESTEAD” took place in 2377, then we can conclude that “HOMESTEAD” must have taken place in April 2378, the 315th anniversary of first contact with Vulcans on April 5, 2063 (STAR TREK: FIRST CONTACT). (2063 + 315 = 2378)
Having proven that “HOMESTEAD” must have taken place in April 2378, then that means that the only possible Stardatetoyear ratios are between 917.351484 Stardates/year and 918.23186 Stardates/year. If we apply each of these ratios to the fact that Stardate 48975.1 must be in the year 2371 (“THE 37’s”), we get the following results:
 Using the lowest possible Stardatetoyear ratio, 917.351484 Stardates/year, that would mean that “THE 37’s” (on Stardate 48975.1) would be 5893.5 Stardates before April 6, 2378(“HOMESTEAD”), which had a Stardate of 54868.6, (54868.6  48975.1 = 5893.5)
which would be 2,346.48872 days before April 6, 2378,(0.39814859 day per Stardate x 5893.5 Stardates = 2,346.48872 days)
which would mean that “THE 37’s” took place on November 3, 2371. This fits with the stated year of 2371 in “THE 37’s”. Using the highest possible Stardatetoyear ratio, 918.23186 Stardates/year, that would mean that “THE 37’s” (on Stardate 48975.1) would be 5893.5 Stardates before April 6, 2378(“HOMESTEAD”), which had a Stardate of 54868.6, (54868.6  48975.1 = 5893.5)
which would be 2,344.23897 days before April 6, 2378,(0.397766856 day per Stardate x 5893.5 Stardates = 2,344.23897 days)
which would mean that “THE 37’s” took place on November 5, 2371. This fits with the stated year of 2371 in “THE 37’s”.If we apply each of the above ratios to the fact that Stardate 41986.0 must be in the year 2364 (“The Neutral Zone”), we get the following results:
 Using the lowest possible Stardatetoyear ratio, 917.351484 Stardates/year, that would mean that TNG episode “The Neutral Zone” (on Stardate 41986.0) would be 12882.6 Stardates beforeApril 6, 2378 (“HOMESTEAD”), which had a Stardate of 54868.6,(54868.6  41986.0 = 12882.6)
which would be 5,129.18903 days before April 6, 2378,(0.39814859 day per Stardate x 12882.6 Stardates = 5,129.18903 days)
which would mean that “The Neutral Zone” took place on March 21, 2364. This fits with the stated year of 2364 in “The Neutral Zone.” Using the highest possible Stardatetoyear ratio, 918.23186 Stardates/year,that would mean that TNG episode “The Neutral Zone” (on Stardate 41986.0) would be 12882.6 Stardates beforeApril 6, 2378 (“HOMESTEAD”), which had a Stardate of 54868.6,(54868.6  41986.0 = 12882.6)
which would be 5,124.2713 days before April 6, 2378,(0.397766856 day per Stardate x 12882.6 Stardates = 5,124.2713 days)
which would mean that “The Neutral Zone” took place on March 26, 2364. This fits with the stated year of 2364 in “The Neutral Zone.”Conclusions:
Given the above facts and calculations, we can conclude that:
 The Voyager episode “HOMESTEAD” (Stardate 54868.6) must have taken place on April 6, 2378.
 The highest possible Stardatetoyear ratio is 918.23186 Stardates per year (or0.397766856 day to 1.0 Stardate, or 1.0 Stardate to 34,367.0564 seconds).
With the two above conclusions, it is possible to calculate a calendar date for any Stardate given in The Next Generation, Deep Space Nine, and Voyager.
Given the date of Voyager episode “HOMESTEAD” (Stardate 54868.6) and a ratio of 918.23186 Stardates per year, it is now possible to calculate the starting point of The Next Generation Stardate system, i.e., Stardate 00000.0.
Stardate 00000.0 would be 54868.6 Stardates before April 6, 2378 (“HOMESTEAD”), which, given the Stardatetoyear ratio established above, would be 21,824.9105 days before April 6, 2378.
(0.397766856 day/Stardate x 54868.6 Stardates = 21,824.9105 days)
Subtracting 21,824 days, 1,311 minutes, from April 6, 2378, calculates to Friday, July 5, 2318, around noon.So we can conclude that Stardate 00000.0 started on Friday, July 5, 2318, around noon (Starfleet Command time).
The following calculators are based on the above explanation. Explore more in TrekGuide.com.

Twentythird Century Stardates
Calculating calendar dates in The Original Series
During the run of The Original Series, there were few references to dates, nor even to the century in which the series took place. Furthermore, the Stardates used in The Original Series had a different starting point than The Next Generation Stardates, so it is impossible to directly extrapolate dates backwards from The Next Generation. However, there were sufficient references in The Next Generation to retroactively calculate dates in The Original Series, with a few additional Stardate facts from episodes of The Original Series, The Next Generation, and Voyager.
Facts:
Fact: In The Next Generation episode “Sarek,” Captain Picard states that Ambassador Sarek is 202 years old. The episode takes place on Stardate 43917.4, which, according to the above calculations, would take place on Tuesday, May 3, 2366. Thus, for Picard’s statement to be true on that date, Sarek would have been born between May 4, 2163 and May 3, 2164.
Fact: In The Original Series episode “JOURNEY TO BABEL,” Ambassador Sarek states that he is precisely 102.437 Earth years old on Stardate 3842.4. Based on the above range determined for the date of Sarek’s birth, “JOURNEY TO BABEL” must have taken place between October 11, 2265, and October 9, 2266.
Fact: The American Thanksgiving holiday typically is celebrated on the fourth Thursday of November.
Fact: In The Original Series episode “CHARLIE X,” the crew of the U.S.S. Enterprise is celebrating Thanksgiving. The given Stardates for this episode were 1533.6 and 1533.7. This is 2308.7 Stardates before Stardate 3842.4 in the episode “JOURNEY TO BABEL,” which was determined above to have taken place between October 11, 2265, and October 9, 2266. (3842.4  1533.7 = 2308.7 Stardates)
Fact: Captain Kirk’s monologue in the opening titles of The Original Series established that the crew was on a fiveyear mission. The earliest Stardate in The Original Series was 1312.4 in “WHERE NO MAN HAS GONE BEFORE,” and the latest Stardate was 5943.7 in “ALL OUR YESTERDAYS,” a difference of 4631.3 Stardates. (5943.7  1312.4 = 4631.3 Stardates)
Fact: If episodes of The Animated Series are also considered part of the original fiveyear mission, then the earliest Stardate was 1254.4 in the animated episode “THE MAGICKS OF MEGASTU,” and the latest Stardate was 7403.6 in the animated episode “BEM,” a difference of 6149.2 Stardates.(7403.6  1254.4 = 6149.2 Stardates)
Fact: In the Voyager episode “Q2,” Icheb states that Kirk completed his historic fiveyear mission in 2270. Therefore, all episodes of The Original Series must have taken place after January 1, 2265 (assuming it was exactly five years), and before January 1, 2271.
Fact: In the episode “DAGGER OF THE MIND,” on Stardate 2715.1, Dr. Helen Noel said she met Captain Kirk at the Science Lab Christmas party.
Fact: Christmas is traditionally celebrated on December 25, and office Christmas parties are typically celebrated sometime in December. Given the possible date range for the fiveyear mission established in“Q2,” the Christmas party referred to in “DAGGER OF THE MIND” must have taken place between December 2265 and December 2270.
Calculations:
Thanksgiving in “CHARLIE X” took place before the episode “JOURNEY TO BABEL” — which, as determined above, took place between October 11, 2265, and October 9, 2266 — and Thanksgiving in “CHARLIE X”must have taken place after January 1, 2265, given the end date of the fiveyear mission in “Q2.”Therefore, the only possible date for “CHARLIE X” would be November 23, 2265 (which is the fourth Thursday of the month, according to the perpetual calendar).
If the Christmas party referred to in “DAGGER OF THE MIND” is assumed to be the same year as Thanksgiving in “CHARLIE X,” then there would be at least a month between the two episodes, a difference of 1181.4 Stardates (giving a ratio of less than 1,000 Stardates per month). If the Christmas party were thefollowing year, then the difference of 1181.4 Stardates would span at least a year (which would give a ratio of at least 1,000 Stardates per year). The Christmas party referred to could not be from the year beforeThanksgiving in “CHARLIE X,” since the possible date range for the fiveyear mission established in “Q2”dictates that the fiveyear mission did not begin before 2265.
Having calculated above that Stardate 1533.7 is on November 23, 2265 (“CHARLIE X,”), and that Stardate 3842.4 (“JOURNEY TO BABEL”) must be between October 11, 2265, and October 9, 2266, the maximum span between Stardates 1533.7 and 3842.4 (a difference of 2308.7 Stardates) can be no more than 320 days (or 0.876130962 year). Therefore, there must be at least 2635.10833 Stardates per year (or at least 7.21468749 Stardates per day).(2308.7 Stardates / 0.876130962 year = 2635.10833 Stardates/year)
This means that Stardate 0000.0 — 1533.7 Stardates before November 23, 2265, in “CHARLIE X” — must have started 0.582025408 year (212.58024 days) before that episode.(1533.7 Stardates / 2635.10833 Stardates/year = 0.582025408 year)
So, assuming the lowest possible Stardatetoyear ratio of 2635.10833 Stardates per year,Stardate 0000.0 began on Tuesday, April 25, 2265, at 00:00 hours.(November 23, 2265  212.58024 days = April 25, 2265)
Conclusions:
Given the above facts and calculations, we can conclude that:
 Stardate 0000.0 began on Tuesday, April 25, 2265, at 00:00 hours.
 The lowest possible Stardatetoyear ratio is 2635.10833 Stardates per year (at least7.21468749 Stardates per day, or less than 0.138606142 day per Stardate).
Therefore, in The Original Series, one Stardate is no more than 11,975,570.7 milliseconds(0.138606142 day = 11,975,570.7 milliseconds)
Given the above starting point and the assumed ratio of 2635.10833 Stardates per year, it is possible to calculate the calendar date for any episode in The Original Series. For example, “DAGGER OF THE MIND,”on Stardate 2715.1, would have taken place on May 6, 2266, just a few months after the Christmas party referred to in the episode.
So the earliest Stardate in The Original Series — 1312.4 in “WHERE NO MAN HAS GONE BEFORE” — took place on October 23, 2265, and the latest Stardate — 5943.7 in “ALL OUR YESTERDAYS” — was on July 27, 2267. (The earliest Stardate in The Animated Series — 1254.4 in “THE MAGICKS OF MEGASTU” — would have taken place on October 15, 2265, and the latest Stardate — 7403.6 in “BEM” — would have taken place on February 15, 2268.)
The following calculators are based on the above explanation. See more in TrekGuide.com

Late Twentythird Century Stardates
Calculating calendar dates in The Movie Series
The first six Star Trek motion pictures continued the pattern of fourdigit Stardates from The Original Series. However, it is clear that it is not a simple linear continuation of the same Stardate system. Therefore, either the time ratio of The Original Series Stardates changed midway through the original fiveyear mission and continued through the movies, or else the motion pictures use another Stardate system with a completely new starting point and different time ratio from The Original Series Stardates.
Facts:
Fact: In STAR TREK: THE MOTION PICTURE, on Stardate 7410.2, Admiral James Kirk has been Chief of Starfleet Operations for the past two and a half years, and hasn’t logged a single star hour in that time, since completing his fiveyear mission. So, based on the end date of the fiveyear mission established in“Q2,” Stardate 7410.2 must be at least two and a half years after January 1, 2270.
Fact: Since STAR TREK: THE MOTION PICTURE, on Stardate 7410.2, takes place two and a half years after Captain Kirk’s original fiveyear mission ended, then it must be at least two and a half years after the latest Stardate in The Original Series — 5943.7 in “ALL OUR YESTERDAYS” — a difference of 1466.5 Stardates.(7410.2  5943.7 = 1466.5 Stardates)
Fact: If episodes of The Animated Series are also considered part of the original fiveyear mission, thenSTAR TREK: THE MOTION PICTURE, on Stardate 7410.2, must take place at least two and a half years after the latest Stardate — 7403.6 in the animated episode “BEM” — a difference of 0006.6 Stardates.(7410.2  7403.6 = 0006.6 Stardates)
Fact: In STAR TREK: THE MOTION PICTURE, on Stardate 7410.2, V’ger is less than three days away from Earth. On Stardate 7414.1, V’ger reaches Earth, so a span of 0003.9 Stardates must be less than three days. (7414.1  7410.2 = 0003.9 Stardates)
Fact: In STAR TREK II: THE WRATH OF KHAN, the Project Genesis video proposal was recorded by Dr. Carol Marcus on Stardate 7130.4. After Stardate 8130.4, Admiral Kirk states that the tape was made “about a year ago.”
Fact: In STAR TREK II: THE WRATH OF KHAN, on Stardate 8130.4, Khan has been stranded on Ceti Alpha Five for 15 years, since Stardate 3143.3 in the episode “SPACE SEED” — which, according to The Original Series Stardate calculations above, would have taken place on July 4, 2266. Therefore, Stardate 8130.4 must take place after July 4, 2281 (assuming Khan is talking about Earth years and not Ceti Alpha Five years).
Fact: In STAR TREK II: THE WRATH OF KHAN, on Stardate 8130.3, Dr. McCoy gives Admiral Kirk a bottle of Romulan Ale (vintage 2283) for his birthday. Therefore, Stardate 8130.3 must take place after 2283 (assuming 2283 is an Earth year, and not a Romulan year or a Stardate).
Fact: In STAR TREK III: THE SEARCH FOR SPOCK, around Stardate 8210.3, Starfleet Commander Morrow states that the U.S.S. Enterprise is twenty years old. An officer later refers to Uhura as a twentyyear space veteran.
Fact: In STAR TREK III: THE SEARCH FOR SPOCK, the U.S.S. Enterprise flight recorder shows that Spock was dying from radiation poisoning after escaping the Genesis Device detonation on Stardate 8128.78. On Stardate 8128.77, Spock had just been exposed to radiation. Stardates 8128.76.00 to 8128.76.32 spanned a few seconds in which Spock performed a mindmeld with Dr. McCoy before entering the irradiated Engineering chamber.
Fact: In STAR TREK IV: THE VOYAGE HOME, on Stardate 8390, the U.S.S. Enterprise crew has been on Vulcan for three months (since just after Stardate 8210.3 in STAR TREK III: THE SEARCH FOR SPOCK). Therefore, a span of 179.7 Stardates represents at least three months(8390  8210.3 = 179.7 Stardates), so 718.8 Stardates would span at least 12 months(179.7 Stardates/3 months x 4/4 = 718.8 Stardates/12 months).
Fact: In STAR TREK V: THE FINAL FRONTIER, on Stardate 8454.1, the U.S.S. Enterprise NCC1701A has been under repairs for at least three weeks. The starship was first seen sometime after Stardate 8390 inSTAR TREK IV: THE VOYAGE HOME, so there must be at least a month in the span of 64.1 Stardates(8454.1  8390 = 64.1 Stardates); therefore, there must be at least a year in a span of 769.2 Stardates (64.1 Stardates x 12 = 769.2 Stardates).
Fact: In STAR TREK VI: The Undiscovered Country, on Stardate 9521.6, the U.S.S. Excelsior detected the destruction of the Klingon moon Praxis, three years after Captain Sulu took command. Two months later, Starfleet Command sends the U.S.S. Enterprise on a diplomatic mission, and Captain Kirk records a log entry on Stardate 9522.6. A few days later, Captain Kirk records his final log entry on Stardate 9529.1. Therefore, a span of 1.0 Stardate is at least two months. (9522.6  9521.6 = 1.0 Stardate).
Fact: In STAR TREK VI: The Undiscovered Country, after Stardate 9522.6, McCoy states that he has been ship’s surgeon aboard the U.S.S. Enterprise for 27 years.
Fact: In the Voyager episode “FLASHBACK,” after Stardate 50126.4, Tuvok states that his first deep space assignment aboard the U.S.S. Excelsior, on Stardate 9521, was approximately 80 years ago, when he was 29 years old. Given the assumed date of Tuvok’s birth on October 14, 2266, then Stardate 9521 must be at least 29 years after October 14, 2266. However, this conflicts with McCoy’s statement that he has been aboard the U.S.S. Enterprise for only 27 years, since his earliest appearance, on Stardate 1512.2 in “THE CORBOMITE MANEUVER,” was almost a year before Tuvok’s birth.
Star Trek XIXII Stardates
Calculating calendar dates in the latest movie
Fact: In STAR TREK, on Stardate 2258.42, Ambassador Spock states that Stardate 2387 is about 129 years in the future, and Stardate 2233.04 is about 25 years in the past.(2387  2258.42 = 128.58 Stardates), (2258.42  2233.04 = 25.38 Stardates).
Fact: An average Earth year comprises about 365.2422 mean solar days. Therefore, each 100th of a year would be 3.652422 days. (1 year / 100 = 365.2422 days / 100 = 3.652422 days).
Fact:In STAR TREK INTO DARKNESS, Stardate 2259.55 is approximately one year later than the events in the previous movie (whose Stardate was 2258.42)..
Conclusion: The new STAR TREK film appears to use a ratio of one Stardate per year; more specifically, the Stardates in the film are consistent with the actual Earth calendar years expressed with two decimal places (presumably representing hundredths of the calendar year). These new Stardates are used to express calendar dates both before The Original Series Stardates and after The Next GenerationStardates.
Using this information, and the above TNG Stardate Calculator and TOS Stardate Calculator, these new Stardates can be compared with calendar dates from both The Original Series and The Next Generation. For example, Ambassador Spock’s given Stardate of 2387 in STAR TREK would take place about eight years after the latest known TNG Stardate in STAR TREK: NEMESIS, whose given Stardate of 56844.9 would be around March 29, 2379, according to the above TNG Stardate Calculator.
Also, the given Stardate of 2258.42 in STAR TREK, when James Kirk is around 25 years old, would take place about seven years before the earliest Stardate in The Original Series, 1312.4 in “WHERE NO MAN HAS GONE BEFORE,” which would be around October 24, 2265, according to the above TOS Stardate Calculator.
Kirk’s birth on Stardate 2233.04 depicted in STAR TREK would be around January 15, 2233, assuming Stardate 2233.00 corresponds with 00:00 hours on January 1, 2233.(00:00 January 1, 2233 + 0.04 x 365.2422 days = 00:00 January 1, 2233 + 14.609688 days).
Given Kirk’s birth date of January 15, 2233 (assuming his birth date in the alternate universe depicted inSTAR TREK was the same as, or close to, his birth date in The Original Series), his exact age can now be calculated for any Stardate given in an episode of The Original Series. In addition, in STAR TREK II: THE WRATH OF KHAN, Admiral Kirk is celebrating his birthday on Stardate 8130.3 when Dr. McCoy gives him a bottle of Romulan Ale (vintage 2283). Therefore, Stardate 8130.3 (in The Movie Series Stardate system) must take place around January 15 in some year after 2283 (or a few weeks after January 15, if it is assumed that the alternate events depicted in STAR TREK caused Kirk to be born prematurely).
Date inconsistencies in episodes
While the episodes and assumptions cited above present a fairly accurate and consistent theory for calculating Stardates, there are many other date references — mostly vague references to years — that conflict with that theory, though these exceptions do not clearly establish a moreconsistent alternative theory, so they may be regarded as errors.
Stardatetoyear ratios:
 In The Original Series episode “THE CORBOMITE MANEUVER”, the span between Stardate 1512.2 and Stardate 1513.8 is described as “18 hours.” That is a difference of 1.6 Stardate units(1513.8  1512.2 = 1.6 Stardates). If 1.6 Stardates are 18 hours, then 1 Stardate would equal 11.25 hours (18 hours / 1.6 Stardates = 11.25 hours/Stardate), and 2.13333333333 Stardates would be one day (24 hours/day / 11.25 hours/Stardate =2.13333333333 Stardates/day), so 779.18336 Stardates would be about a year(2.13333333333 Stardates/day x 365.2422 days/year = 779.18336 Stardates/year). Giventhe above calculations that there must be at least 2635.10833 Stardates per year (or at least 7.21468749 Stardates per day), the Stardates and hours stated in “THE CORBOMITE MANEUVER” are inconsistent with the overall progression of Stardates in The Original Series.
 In The Original Series episode “THE GAMESTERS OF TRISKELION”, the span between Stardate 3211.8 and Stardate 3259.2 is described as “nearly two hours.” That is a difference of 47.4 Stardate units (3259.2  3211.8 = 47.4 Stardates). If 47.4 Stardates are nearly two hours, then 568.8 Stardates would be nearly a day (47.4 Stardates/2 hours x 24 hours/day =568.8 Stardates/day), and 207,749.76 Stardates would be nearly a year(568.8 Stardates/day x 365.2422 days/year = 207749.76 Stardates/year). This is inconsistent with the slow progression of fourdigit Stardates throughout The Original Series, demonstrating that Stardate spans shown within single episodes cannot be extrapolated to measure Stardates across multiple episodes.
 In The Next Generation episode “Pen Pals,” the Enterprise enters the Selcundi Drema Sector on Stardate 42695.3. On Stardate 42696.3, Lieutenant Commander Data picks up an alien radio signal. On Stardate 42737.3, Captain Picard states that it has been six weeks since the Enterprise entered the Selcundi Drema Sector. Shortly before Stardate 42741.3, Data says he picked up the alien transmission eight weeks ago. So there is a span of 42.0 Stardates in six weeks(42737.3  42695.3 = 42.0 Stardates), for a ratio of about 7.0 Stardates per week, and a span of 45.0 Stardates in at least eight weeks (42741.3  42696.3 = 45.0 Stardates), for a ratio of 5.625 Stardates per week. These ratios would extrapolate to about 1 Stardate per day, or between 292 and 365 Stardates per year.
 In The Next Generation episode “The Best of Both Worlds” Part II,” the battle between Starfleet and the Borg at Wolf 359 starts after Stardate 44001.4. and shortly before Stardate 44002.3. In theDeep Space Nine episode “EMISSARY,” it was stated that Captain Picard was kidnapped by the Borg on Stardate 43997 for six days, during which he led an assault on Starfleet at Wolf 359, resulting in the death of Jennifer Sisko. Three years later, on Stardate 46379.1, Commander Sisko is reassigned to station Deep Space Nine in orbit of Bajor. So there is a span of about 2376.8 Stardates in three years (46379.1  44002.3 = 2376.8 Stardates), for a ratio of about 792.266666667 Stardates per year (2376.8 Stardates / 3 years = 792.266666667 Stardates/year).
 In the Deep Space Nine episode “SECOND SIGHT,” on Stardate 47329.4, Commander Sisko records a personal log stating that the previous day was the fourth anniversary of the massacre at Wolf 359 and the death of Jennifer Sisko. So there is a span of about 3327.1 Stardates in four years(47329.4  44002.3 = 3327.1 Stardates), for a ratio of about 831.775 Stardates per year(3327.1 Stardates / 4 years = 831.775 Stardates/year). (It is unclear whether Sisko is describing Earth years or Bajoran years, since he is on a Bajoran station with 26 hours per day.)
 In the Voyager episode “RELATIVITY”, Seven of Nine states on Stardate 49123.5621 that theVoyager will be destroyed in three years, six months and two days, on Stardate 52861.274 — a difference of 3737.7119 Stardates. This is a span of 1,280 to 1,282 days (3.504522888 to 3.509998705 years), depending on leap years and lengths of different months, giving a ratio ofaround 1,065 Stardates per year.
 In the Voyager episode “TIMELESS,” Captain Janeway states that the Voyager has been in the Delta Quadrant for four years, two months, and 11 days. The following morning, around 08:00 hours, she records a log entry on Stardate 52143.6. In the Voyager episode “CARETAKER,” the Voyager was brought to the Delta Quadrant three days before Stardate 48315.6 — a difference of 3828.0 Stardates before “TIMELESS.” Therefore, there is a span of 1,531 days (4.191737923 years) in a span of 3828.0 Stardates, giving a ratio of 913.225 Stardates per year.
 Between Day 65 and Day 70 of the Voyager episode “YEAR OF HELL,” a captain’s log was recorded on Stardate 51268.4 (May 5, 2374, according to the above calculations), and Chakotay later mentions that it is May 20 (Captain Janeway’s birthday).In “YEAR OF HELL, PART II,” on Day 133 a captain’s log is recorded on Stardate 51425.4 (July 6, 2374, according to the above calculations).Between Day 207 and Day 257, Janeway mentions her birthday was “five months ago;” she later records a captain’s log on Stardate 51682.2 (October 16, 2374, according to the above calculations).On Day 1 after the timeline is restored, a captain’s log is recorded on Stardate 51252.3 (April 28, 2374, according to the above calculations). Therefore, there is a span of 16.1 Stardates in the first 64 days of the “YEAR OF HELL” (51268.4  51252.3 = 16.1 Stardates), giving a ratio of 0.2515625 Stardate per day (16.1 Stardates / 64 days = 0.2515625 Stardate/day), or 91.88 Stardates per year.The captain’s log recorded between Day 207 and Day 257 would be 429.9 Stardates after Day 1(51682.2  51252.3 = 429.9 Stardates) and at least “five months” or 413.8 Stardates after Day 65 (51682.2  51268.4 = 413.8 Stardates). These date spans give a possible ratio of around 700 to 1,000 Stardates per year.
The captain’s log recorded on Stardate 51425.4 on Day 133 would be 173.1 Stardates after Stardate 51252.3 on Day 1 (51425.4  51252.3 = 173.1 Stardates), giving a span of 173.1 Stardates in 132 days, or a ratio of 1.3113636364 Stardates per day (173.1 Stardates / 132 days =1.3113636364 Stardates/day), or 478.96533956 Stardates per year.
 In The Next Generation episode “The Naked Now,” Data first uses his sexual techniques just after Stardate 41209.3 (May 22, 2363, according to the above calculations).In STAR TREK: FIRST CONTACT, a couple days after Stardate 50893.5 (December 7, 2373, according to the above calculations), Data states that he last used his programming in sexual techniques eight years, seven months, sixteen days, four minutes, twentytwo seconds ago (which, according to thedate calculator, would be a couple days after April 21, 2365, or after Stardate 42973, according to the above calculations; this would place Data’s last use of his programming in sexual techniques between the last two episodes in The Next Generation‘s second season).However, if Data used his programming in sexual techniques only twice — in “The Naked Now” andSTAR TREK: FIRST CONTACT — then the span of “eight years, seven months, sixteen days, four minutes, twentytwo seconds” (or 272,333,062 seconds) would be a little more than the span between Stardates 41209.3 and 50893.5 (9684.2 Stardates), giving a ratio of less than 9684.2 Stardates per 272,333,062 seconds (or 8.62989831 years), or less than 1122.16849517 Stardates per year. (9684.2 Stardates / 8.62989831 years = 1122.16849517 Stardates/year)
Given the wild inconsistencies of Stardate ratios in different episodes, some varying by a factor of ten, there can be no conclusive determination of an actual Stardatetoyear ratio for all episodes. Therefore, the ratio of 918.23186 Stardates per year, as calculated above, will remain the basic assumption upon which the above TNG Stardate Calculator is based.
Tuvok’s Birthday
 In the Voyager episode “EX POST FACTO,” it is stated that Tuvok has been married for 67 years.
 In the Voyager episode “FLASHBACK,” after Stardate 50126.4, Tuvok states that his first deep space assignment aboard the U.S.S. Excelsior, on Stardate 9521, was approximately 80 years ago, when he was 29 years old.
 In the episode “UNIMATRIX ZERO” PART II, it is stated that Tuvok was born on Vulcanis Lunar Colony on Stardate 38774. This last reference is clearly an error, since Stardate 38774 in The Next Generation system would be just three years before “The Neutral Zone” (41986.0), which gave the year as 2364 — meaning Tuvok would be just 10 years old in Voyager‘s first episode on Stardate 48315.6.It is likely that the decimal was left out of Tuvok’s given birth date, and he was really born on Stardate 3877.4 (October 14, 2266, based on the above calculations) in The Original SeriesStardate system. This would place his birth just after The Original Series episode “JOURNEY TO BABEL”, which had a Stardate of 3842.3. Given a birth date of October 14, 2266, Tuvok would be about 106 years old on Stardate 50126.4 in “FLASHBACK,” which would be on February 5, 2373, according to the above Stardate Calculator.As stated in “FLASHBACK,” Tuvok was 29 years old on Stardate 9521, meaning that STAR TREK VI: The Undiscovered Country must have taken place within the year following October 14, 2295.
 However, in the episode “FURY,” Captain Janeway celebrates Tuvok’s birthday, stating it is not long before he reaches “the big three digits.” The episode had no Stardate, but the episode before it took place on Stardate 53918, which would place it in the middle of 2377 (based on the abovecalculations). If the statement “the big three digits” is taken to mean “100 Earth years,” then this would mean that Tuvok would be born after 2277, making him 11 years younger than assumed above. But if “the big three digits” is taken to mean “111 Earth years” (three identical digits), that would be consistent with the above assumptions, since Tuvok would be born on October 14, 2266 (TOS Stardate 3877.4), making him 111 years old on October 14, 2377. This could mean that“FURY,” (which had no Stardate) might be shown out of order, and actually took place on Tuvok’s 110th birthday, October 14, 2376. (Of course, it is unclear whether Janeway’s statement even refers to Earth years rather than Vulcan years, so the statement may not be inconsistent after all, since the duration of a Vulcan year has not been established.)
 In the Enterprise episode “AWAKENING,” Minister Kuvak of the Vulcan High Command states that Earth and Vulcan have been allies for 100 years. The episode takes place in the middle of the year 2154, and apparently refers to first contact between Earth and Vulcans on April 5, 2063, a span of more than 91 Earth years. Since Vulcans are known to quote numbers with great precision, and the statement about 100 years was made between two Vulcans on the planet Vulcan with no humans present, it would be reasonable to assume they were describing the time span in Vulcan years. If so, then 100 Vulcan years is about 91 Earth years, so one Vulcan year would be about 0.91 Earth year. Therefore, Tuvok’s age of 111 Earth years would be equivalent to about 121 Vulcan years, making Janeway’s statement in “FURY” about him soon reaching “the big three digits” inaccurate in both Earth and Vulcan years.
Fonte: TrekGuide.com
=/\= STAR TREK Episode Guide =/\= The Original Series =/\= . . . season 1 . . . season 2 . . . season 3 =/\= The Animated Series =/\= . . . season 1 . . . season 2 =/\= The Movie Series =/\= . . . I – VI . . . TNG . . . XI =/\= The Next Generation =/\= . . . season 1 . . . season 2 . . . season 3 . . . season 4 . . . season 5 . . . season 6 . . . season 7 =/\= Deep Space Nine =/\= . . . season 1 . . . season 2 . . . season 3 . . . season 4 . . . season 5 . . . season 6 . . . season 7 =/\= Star Trek: Voyager =/\= . . . season 1 . . . season 2 . . . season 3 . . . season 4 . . . season 5 . . . season 6 . . . season 7 =/\= Enterprise =/\= . . . season 1 . . . season 2 . . . season 3 . . . season 4 Search PADDMap of the Galaxy . . . Alpha Quadrant . . . Beta Quadrant . . . Gamma Quadrant . . . Delta QuadrantFerengi Rules of AcquisitionStardates and Calendar DatesNewsStar Trek Store [U.S.]Star Trek Store [Canada]