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Science-Fiction Adventure in the Far Future
Dating Systems

Dating Systems

Three major dating systems are in use when referring to historical events within the Imperium - Terran, Vilani, and Imperial. Other races also have their own dating systems.

Terran dates centre on a year about midway through the period of Vilani ascendance. After that date, years ascend and are suffixed AD; before that date, years descend and are suffixed BC. There is no year zero. Terran years have 365 days and are considered a standard for length of year. Years are further subdivided into months and weeks, although these divisions have fallen into disuse outside the Solomani Sphere.

Vilani dates count from the year of the Establishment of the First Imperium (the Vilani Imperium). Those before are suffixed PI (Pre-Imperium); those after are suffixed VI (Vilani Imperium). There is no year zero. Vilani years are approximately 1.33 standard years in length (496 days). Vilani years are further subdivided into seasons, months, and weeks.

Imperial dates count from the year of the founding of the Third Imperium, specifying the year zero as a holiday year. Dates before that are negative; dates after that are positive, usually with the sign suppressed. Imperial dating uses a julian system for specifying days. Each day in the year is consecutively numbered beginning with 001. Thus, in the year 1105, the first day of the year is 001-1105. Weeks of seven days and months of 28 days are used to refer to lengths of time, but rarely to establish dates.

Zhodani dating is in olympiads (tleqazdijdiet). Each olympiad is of three Zhodani years; years are 0.75 standard years in length (273 days). An olympiad is used to mark the period from one set of Psionic Games to the next. Zhodani dates are given in olympiads, which are further subdivided into year, season, and day. The first olympiad corresponds to 2209 BC. The dating system itself has been in more or less continuous since then, with minor lapses due to war or temporary decline of ruling parties.

The Aslan calendar is based on the revolution of Kusyu (Kilrai' / Dark Nebula 1919) around Tyeyo, its star. The Aslan year (ftahea) is about 320 standard days. A day (eakhau) is about 36 hours long. The same calendar is used on most Hierate worlds. There are no sub-divisions in the Aslan calendar; each day has its own unique name. The calendar takes as its starting point the first selection of the Tlaukhu as supreme council on Kusyu, about -2083 Imperial.

As in other things, the Vargr acknowledge no universal calendar. Individual planets impose years based on their own planet's movements; sometimes these standards are imposed across larger areas of space, but the is no true Vargr "standard year". Calendars date from whatever event the local populace cares to choose as a starting point.

Imperial historians tend to assign dates in one of two forms, either according to the Imperial calendar, or based upon the Diaspora (Gvegh Vargr: gzokdae) or invention of interstellar travel by the Vargr in the year -3810. This latter is frequently used in giving dates to events in Vargr history.

Ref: ADV-2, ADV-3, 1106; SUPP-8, SUPP-11, 1107; ALIENS-1, ALIENS-3, 1,