Nineteen-Day Fast to be the one foretold by the Báb, accepted the fast, but altered many of its details and regulations. The Bahá'í fast resembles fasting practices of several other religions. Lent is a period of fasting for Christians, Yom Kippur and many other holidays for Jews, and the fast of Ramadan is practiced by Muslims. The Bahá'í fasting most resembles the fast of Ramadan, except that the period of fasting is defined as a fixed Bahá'í month, whereas Muslims fast during a lunar month, whose specific Gregorian dates vary from year to year. Bahá'u'lláh established the guidelines of the fast in
Ramadan observed at dawn and sunset. Alternatively, Muslims may follow Mecca time. Muslims will continue to work during Ramadan. The prophet Muhammad said that it is important to keep a balance between worship and work. In some Muslim countries, such as Oman, however, working hours are shortened during Ramadan. It is often recommended that working Muslims inform their employers if they are fasting, given the potential for the observance to impact performance at work. The extent to which Ramadan observers are protected by religious accommodation varies by country. Policies putting them at a disadvantage compared to other employees have been met