The Vilani calendar has its basis in the
depths of antiquity; its units were dictated by the period and rotation
of Vland (the Vilani
homeworld) around Urakkalan, its star.
The Vilani distinguish between days and nights when they count
time. A drandir is one complete rotation of Vland and is
equal to about 23.35 standard hours.
A drandir consists of a dran (day) and a dir (night). Since the
Vilani gurkala (year) is 500 drandir long, there are a total of 1000
dran and dir in the year. The gurkala is 478.72 standard days in
length, about 1.33 standard years.
The Vilani calendar uses as its base point the founding of the Vilani Empire in -4045; that yeara
is treated as year 1. The Vilani date 3882 corresponds to the Imperial date 1120.
Vilani dates are entirely decimal. Vilani count both dran and dir
when noting dates. Dran are odd; dir are even. Dates are
expressed in the format year.drandir. For example, 3870.000 is
the first half-day of the year 3870; since 000 is even, it referes to
the dir (night). 3876.999 is the last half-day of the year 3876;
since 999 is odd, it refers to the dran (day).
The extremely rational system of Vilani date format makes each date
refer to the fraction of the year when specifying a date. For
example, 3766.500 is exactly halfway through the year 3766.