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The Halkeginian calendar has 384 days per year. A year is divided into twelve months, one month is divided divided into four weeks, and one week is divided into eight days.[1]

It is unknown if there are leap years. If there is no intercalation, the seasons will drift through the years. Also unknown is the length of a day. Since Hiraga Saito does not notice any disparity from his circadian rhythm, a day is probably comparable in length to an Earth day.


  1. The Fairies' Holiday (Volume 12), "Knight Corps of the Water Spirit, Charge!" (Story 2), Chapter 1