All races need a way to classify time before they can create long lasting empires. Most measure time in either days (rotation of the planet, usually perceived as the sun moving across the sky), months (the time it takes a planetary moon, often but not always tidally locked to finish its cycle), seasons (variations in climate caused by irregularities in a planets rotation) or kolthrasses, their orbital counterpart, years (time it takes for a planet to finish its rotation around it's parent star) or multiples thereof. This list catalogs all main calendars of the main cultures.
The Gregorian calendar is the main calendar used in the 21st century, it was created by the Roman Catholic church to correct the errors in the Julian calendar. It divides years into twelve months, Nitraka Tosu, Nitraka Kosi, Kulthis Vado, Kulthis Tira, Vontyok Gosa, Vontyok Riko, Vontyok Lira, Nilyara Ilso, Nilyara Kasu, Nilyara Ordu, Tivgada Karo and Tivgada Daru.
The Tovukal calendar divides the Aldarthan year into five 73 day Korlims, these months are named Nitraka, Kulthis, Vontyok, Nilyara and Tivgada. Hundreds of years are known as Voriktadors, thousands Alnasadors This system fall out of use after the fall of Tovukal because of the difficulty of measuring Korlims compared to months and is mainly used for historical purposes, although it helped define later calendar systems.