Purpose: Bahai Calendar is a thought and modification of religious figures that is Bahaullah (the chapter). Theoretical framework: The almanac begins in 1844 ad for the reason of that year the proclaimed chapter. Then that year then the 1st year of the Bahai Era (EB). Totaling 7 days, the beginning of the day is Saturday. The month amounted to 19, 19 days each. One year it amounted to 361 days. Has a 19-year cycle called Vahid, if it has been through 19 times the Vahid cycle (361 years) then Kulli Shay-I. Design/methodology/approach: The beginning of the year falls between the 21st or the 20th of March by adjusting the time of the Vernal Equinox (Spring Entry) at the point of Aries. The names of the moon and the day are derived from the attributes that relate to God, the philosophy of number 19 is derived from the number of letters in Lafadz Bismillahirrahmanirrahim. Findings: The Bahai calendar is a calendar that will always spin and cycle fixed by a total of 7 days a week. A total of 19 months, each 19 days. One year it amounted to 361 days. It has a 19-year cycle called Vahid, 19 times the Vahid cycle (361 years) then Kulli Shay-I. The beginning of the year falls between 21 or 20 March adjusting the occurrence of the Vernal Equinox at the point of Aries. Research, Practical & Social implications: There were additional days (Ayyam-I HAA-i) 4 days in the year of Basitoh and 5 days in leap year, so that the beginning of the year falls on the same date. Originality/value: Bahai dating system uses the celestial object of the sun as a reference for use, hence the date of Syamsiyah (Solar Calendar). This reality has been plural in Indonesia.