Dantrian calendar is the most used calendar on the Continent. It was established over a thousand years ago by the Western Dantrian Civilization.

Based on the idea of cycles and the Quun Tirtoir (infinite staircase) of Lolion, the calendar establishes “revolutions” of the spiral to be 2000 years long. The current revolution is the third. Recorded history, thus, begins over 5000 years ago.

Dates span from 1-2000 and are written down as 863 FR, which would stand for “first revolution”. Centuries are abbreviated as “CFR”, “CSR”, etc. So, the current century is 11th CTR, which stands for “11th century of the third revolution”. It can also be written as “11th century TR”. In a sentence, revolutions and their ordinal numbers are typically not capitalized: “first revolution”.

While in English such a system would pose a problem, since many ordinal numbers start with the same letters (first, fourth, fifth, etc.), the calendar's numerals are in Mandae, which uses separate letters for each of the ordinal numbers up to twelve. Thus, the dantrian calendar might run into problems only after the twelfth revolution.

An alternative calendar which counts absolute years, as opposed to periods of 2000 years, had been in use in the east up until War.

Luckily, the calendar also counts 12 months, which allows gearthian researchers to apply the usual month labels to the dates.