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- Day redirects here. For the Bajoran Field Colonel, see Day Kannu.
A millennium was a period of one thousand years.
A century was a period of one hundred rotations around the sun.
A decade was a period of ten years.
Standard UFP solar yearEdit
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.
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.
|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|
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.
|The days of the Human week|
|Sunday • Monday • Tuesday • Wednesday • Thursday • Friday • Saturday|
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 Edit
Solar and Stellar day Edit
A solar day is the amount of time it takes for a planet to spin from facing its sun to facing the sun again, with the small amount of extra turning from a small portion of a year cycle factored in. A stellar day is the amount of time it takes for a planet to rotate 360 degrees, regardless of its location on its year cycle.
Earth has 24 hours in a solar day and 23 hours, 56 minutes, and 4 seconds in a Stellar day.
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.
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.
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.
A nanosecond was one billionth of a second.
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.