A Maya month or uinal consists of 20 solar days or kins. The 260-day sacred year or tzolkin consists of 13 months of 20 days, while the 365-day vague year or haab, consists of 18 months of 20 days, called the tun, followed by an intercalary month of five days called the uayeb.Longer cycles can be incorporated in the Maya calendar.he Maya actually used two calendars, a sacred year of 260 days and a vague year of 365 days. Along with other Mesoamerican peoples, the Maya use the sacred year for religious purposes and to name children, for example. The vague year is used for such things as planting crops.