The Bahá’í Fast for 2025 will take place from March 1–19. Adult Bahá’ís in good health observe the fast from sunrise to sundown during this 19-day period. The Bahá’í calendar is a solar calendar with 19 months of 19 days each, plus 4–5 intercalary days to make up for the year’s 361 days. Bahá’í holidays begin at sunset on the day before the given date.