有好多有關曆法改革嘅建議，例如係世界曆、國際固定曆、全新世紀年及漢克亨利萬年曆（ Hanke-Henry Permanent Calendar）。類似嘅諗法係唔同時期都有出現，但係因為無連續性、實施嘅時候要大規模調整，或者宗教反對等等嘅原因，最後都無實現到。
There are many proposals for calendar reform, such as the World Calendar, the International Permanent Calendar, the New Century Year and the Hanke-Henry Permanent Calendar. Similar ideas have arisen at different times, but they have not been realized in the end because of the lack of continuity, the need for large-scale adjustments in implementation, and perhaps religious opposition.