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Since the last papal reform, several proposals have been offered to make the Western calendar more useful or regular . Very few reforms, such as the rather different decimal French Republican and Soviet calendars, had gained official acceptance , but each was put out of use shortly after its introduction. After World War II the new-formed United Nations continued efforts of its predecessor, the League of Nations, to establish a new calendar but postponed the issue after a veto from the USA, which was mainly based upon concerns of religious groups about the proposed days out of the week cycle. Independently the World Council of Churches still tries to find a common rule for the date of Easter, which might be eased by a new common calendar.