The day was divided into five parts: dawn to noon, noon to 3 or 4 p.m., 3 or 4 p.m. to twilight, twilight to midnight, and midnight to dawn. In winter, the second period became part of the first.
The year was divided into twelve months of thirty days each. Each day and each month were named after the attributes of God. When the names of a day and a month coincided, a holy day was declared. A year also contained six shorter groupings, used as festivals.
In common years, five days were added at the end of the year. To compensate for no leap year, one month was added every 120 years.