Let the days in excess of the months be placed before the month of fasting.
The Badí' calendar is based on the solar year of 365 days, 5 hours, and 50 odd minutes. The year consists of 19 months of 19 days each (i.e. 361 days), with the addition of four extra days (five in a leap year). The Báb did not specifically define the place for the intercalary days in the new calendar. The Kitáb-i-Aqdas resolves this question by assigning the “excess” days a fixed position in the calendar immediately preceding the month of 'Alá', the period of fasting. For further details see the section on the Bahá’í calendar in The Bahá’í World, volume XVIII.
Whoso layeth claim to a Revelation direct from God, ere the expiration of a full thousand years
The Dispensation of Bahá’u’lláh will last until the coming of the next Manifestation of God, Whose advent will not take place before at least “a full thousand years” will have elapsed. Bahá’u’lláh cautions against ascribing to “this verse” anything other than its “obvious meaning”, and in one of His Tablets, He specifies that “each year” of this thousand year period consists of “twelve months according to the Qur’án, and of nineteen months of nineteen days each, according to the Bayán”.
The intimation of His Revelation to Bahá’u’lláh in the Síyáh-Chál of Tihrán, in October 1852, marks the birth of His Prophetic Mission and hence the commencement of the one thousand years or more that must elapse before the appearance of the next Manifestation of God.
The number of months in a year, appointed in the Book of God, is nineteen.The Bahá’í
year, in accordance with the Badí' calendar, consists of nineteen months of nineteen days each, with the addition of certain intercalary days (four in an ordinary
year and five in a leap
year) between the eighteenth and nineteenth months in order to adjust the calendar to the solar
year. The Báb named the months after certain attributes of God. The Bahá’í New
Year, Naw-Rúz, is astronomically fixed, coinciding with the March equinox (see note
26). For further details, including the names of the days of the week and the months, see the section on the Bahá’í calendar in
The Bahá’í World, volume XVIII.