Throughout the year, the Cambodians celebrate many holidays, most of a religious or spiritual nature, some of which are also observed as public holidays. The two most important are "Chol Chhnam" (Cambodian New Year) and "Pchum Ben" ("Ancestor Day"). The Cambodian Buddhist calendar is divided into 12 months with the traditional new year beginning on the first day of , which coincides with the first new moon of April in the western calendar. The modern celebration has been standardized to coincide with April 13.