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“Calendar reform” books examine proposals to redesign how we structure and reckon the year—months, weeks, leap rules, and era numbering—to improve accuracy, regularity, usability, or cultural fit. The category spans history and advocacy: from analyses of major shifts like the Gregorian replacement of the Julian calendar and experiments such as the French Republican and Soviet calendars, to modern schemes like the World Calendar, International Fixed Calendar, Symmetry454, and the Holocene Era. Works typically blend astronomy and mathematics (solar cycles, leap-day algorithms), with social, religious, economic, and legal considerations (holiday placement, business planning, international standardization, data interoperability). They assess motivations and trade-offs—seasonal alignment, equalized months, predictability versus tradition—alongside adoption barriers, conversion problems, and cultural resistance. Some titles are technical or comparative surveys; others are historical narratives or manifestos advocating specific reforms.

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