The Baha'i calendar has 19 Months of 19 days each, totalling 361 days in a year + the intercallery days (Ayyam-i-Ha). Only a leap year has 366 days. Obviously Husayn 'Ali Nuri (Baha) could not count properly because any solar intercalary calculation would make those days Ayyam-i-Dal (i.e. the days to the calulation of the letter dal, 'd', letter dal = 4) not Ha (letter ha = 5). Ayyam-i-Ha would technically only occur for the leap years not the normal years. So much for the 'supreme manifestation of the day' who could not even count properly!
Thus the so-called Ayyam-i-Ha of Baha'i faith comes only once in 5 years. Rest 4 years have Ayyam-i-Dal.OK !