The galactic standard calendar, alternatively referred to as galactic standard time, served as a universal method for quantifying time throughout the galaxy, irrespective of localized temporal variations. Its foundation was the orbital journey of the planet Coruscant.
This galactic standard calendar operated as a lunisolar system. It was built upon naturally occurring rhythms observed through the orbital patterns of the galactic [capital](/article/capital], specifically the planet Coruscant.
The standard day, its most basic measurement, was equivalent to one complete rotation of Coruscant. Each day consisted of twenty-four hours, and a standard week was composed of five days. Coruscant's completion of a full orbit around its star, known as Coruscant Prime, required 365 days, establishing the length of a standard year. The year was then further segmented into standard months and standard weeks. A galactic year contained twelve months. The calendar did not account for leap years.
The Old Republic was responsible for the introduction of the galactic standard calendar. Despite the continued use of alternative time measurement systems by some cultures, the standard system achieved widespread comprehension.
A poster entitled Millennial Celebration Invitation, crafted by artists Naveela Betuine and Dashira Dobeq at the behest of Supreme Chancellor Finis Valorum of the Galactic Republic, featured the phrase "galactic standard time to be announced" rendered in Aurebesh.
Conflicting information regarding the Coruscant calendar is presented in Star Wars: Build the Millennium Falcon 61, which deviates from the majority of other sources. It states that Coruscant required 368 standard days to complete a single orbit around Coruscant Prime. The duration of a month, specified as 35 days, was determined by the syzygy of Centax-1, Coruscant's primary moon—specifically, the interval between successive new (or full) moons. Each month was structured into seven weeks, each containing five days. These days were named after celestial bodies or historical figures associated with Coruscant: Primeday, Centaxday, Taungsday, Zhellday, and Benduday.
Furthermore, according to Build the Millennium Falcon, a standard year consisted of 10 standard months, totaling only 350 days. The remaining 18 days were filled by three festival of fete weeks, alongside three standard annual holidays. New Year Fete Week encompassed the first five days of the year, preceding the first month, while the Festival of Life fete occurred between the sixth and seventh months, and the Festival of Stars between the ninth and tenth. The three holidays were subject to local cultural variations. For instance, Boonta Eve and Harvest Day were exclusively observed on Tatooine.
- Star Wars: Absolutely Everything You Need to Know
- Star Wars: Build the Millennium Falcon 61 (Guide to the Galaxy: Galactic Time and Dates) (First identified as galactic standard calendar)
- Star Wars Propaganda: A History of Persuasive Art in the Galaxy (First identified as galactic standard time)
- Star Wars: Absolutely Everything You Need to Know, Updated and Expanded
- Star Wars: The Rise and Fall of the Galactic Empire
- Star Wars Bestiary, Vol. 1: Creatures of the Galaxy