- Day redirects here. For the Bajoran Field Colonel, see Day Kannu.
Millennium
A millennium was a period of one thousand years.
In 2000, Henry Janeway expressed his belief that he'd been born in the wrong millennium. (VOY: "11:59")
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Century
A century was a period of one hundred rotations around the sun.
Human and Vulcan centuries were not equivalent to Lactran centuries. (TAS: "The Eye of the Beholder")
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Decade
A decade was a period of ten years.
According to Trip Tucker in the mirror universe, a Human lost a decade off their life expectancy for every year spent working near a warp core. (ENT: "In a Mirror, Darkly")
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Year
A year was the amount of time it took for a planet to orbit its sun. If the planet had an axial tilt, this resulted in seasons, like winter, spring, summer, and fall.
Standard UFP solar year
Standard UFP solar years were mentioned in the Treaty of Armens. (TNG: "The Ensigns of Command", okudagram)
Earth year
One Earth year was equal to 365.2425 Earth days in the Gregorian calendar. To compensate for the fraction of a day, a leap day was added to every year whose number was divisible by four, unless it was a century, unless it was divisible by 400. These leap years consisted of adding an extra day to the month of February. Instead of the usual 28 days, there would be 29.
Scientists usually used a Julian year of 365.25 days for measurements and scientific comparisons.
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Month
A month was usually the amount of time it took for a moon to orbit its planet. This was usually a portion of a year, and a large number of days (in which case it may be broken down into weeks).
On Earth a month was originally the length of the lunar cycle (29.53 days). Most calendars at some point made the month one twelfth of a solar year (30.44 days). In Earth's most common calendar, the months are either 30 or 31 days long, with one shorter month (February) having 28 or 29 days depending on the year.
On an uninhabited planet it only gets night four days a month due to its binary stars. (ENT: "The Catwalk")
| Months of the year |
|---|
| Earth months: January • February • March • April • May • June • July • August • September • October • November • December |
| Qo'noS months: Maktag • nay'Poq |
| Vulcan months: Tasmeen |
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Week
A week was small number days grouped together as part of a calendar system. It could be a portion of a month or an unrelated grouping.
On Earth a week was seven days.
Takret only needed to sleep once a week. (ENT: "The Catwalk")
Travis Mayweather and his father once stuck up in the ship's core when engaging a class 3 storm. They were down there for six weeks. (ENT: "The Catwalk")
| The days of the Human week |
|---|
| Sunday • Monday • Tuesday • Wednesday • Thursday • Friday • Saturday |
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Day
A day was the amount of time it takes for a planet to spin once on its own axis. This resulted in a day/night cycle (with day in this second case meaning the sunlit portion of the full day).
On Earth, a full day was divided up into twenty-four hours, whereas on Deep Space 9, a full day was divided into twenty-six hours. (DS9: "Afterimage")
On an uninhabited planet that Enterprise NX-01 explored in 2152, night was only available on four days a month due to the planet's binary stars. (ENT: "The Catwalk")
In 2263 of the alternate reality, USS Enterprise Captain James T. Kirk told Doctor Leonard McCoy, shortly after Kirk returned from an unsuccessful away mission to the planet Teenax, that it was "just another day in the fleet." Kirk subsequently made a log entry in which he reported that the Enterprise was on its 966th day in deep space, and that telling where one day ended and the next one began was increasingly difficult. This was around a couple of days before his thirtieth birthday. (Star Trek Beyond)
A day was divided into time units including morning, afternoon, evening, and night. Midnight was a specific time on a day. (ENT: "The Catwalk"; DS9: "The Nagus", "The Storyteller", "Defiant"; VOY: "Resistance")
Standard UFP solar day
Standard UFP solar days were mentioned in the Treaty of Armens. (TNG: "The Ensigns of Command", okudagram)
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Hour
An hour was a portion of a day, this could be a decimal tenth of a day, or some other fractional portion of a day.
On Earth an hour was an SI unit of time that was approximately 1/24 of a day, and was divided up into 60 minutes.
A shapeshifter had to regenerate after sixteen hours in solid form. (DS9: "The Forsaken")
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Minute
A minute was a portion of an hour, this could be a decimal hundredth of an hour, or some other fractional portion of an hour.
On Earth a minute was 1/60 of an hour, and was divided up into 60 seconds.
In colloquial speech, a minute can also mean an undefined short amount of time, as in "I'll be just a minute". (citation needed • edit)
The crew of Enterprise NX-01 would be dead within three minutes when exposed to the radiolytic isotopes of a neutronic storm. (ENT: "The Catwalk")
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Second
A second was a portion of a minute, this could be a decimal hundredth of a minute, or some other fractional portion of a minute.
On Earth a second was 1/60 of a minute, and was usually divided up decimally.
Taking a neural toxin would kill the Denobulan Phlox in only a few seconds. (ENT: "Regeneration")
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Nanosecond
A nanosecond was one billionth of a second.
In 2365, the USS Yamato was destroyed by a plasma vent that lasted T+2.25 nanoseconds. (TNG: "Contagion")
To attract the attention of the Crystalline Entity, the USS Enterprise-D emitted five-nanosecond graviton emissions at one pulse per second. (TNG: "Silicon Avatar")
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Stardate
Main article: Stardate
In the 23rd century, stardates were not directly related to Earth's calendar. Beginning in 2323, stardates were changed to be 1,000 per Earth year.