This is the holiest month in the Islamic Year and begins at the sighting of the new moon. It commemorates the period during which Prophet Mohammad received divine revelations. Observing Muslims fast between the hours of sunrise and sunset during the entire month, read the Qu’ran and worship in the mosque or at home. The dates vary by a day depending on whether the Saudi Arabia or the North American Calendar is being observed. This calendar follows the North American dates which is a day later.