Chronera: Open-Source TypeScript Library Brings Type-Safe Multi-Calendar Date Handling

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A new open-source library called Chronera has been built in strict TypeScript to handle date calculations across multiple calendar systems without relying on the 'any' type or external dependencies. Existing JavaScript date libraries such as date-fns, dayjs, and Luxon largely ignore non-Gregorian calendars, creating gaps for enterprise applications in banking, healthcare, and public sectors that operate under legal date systems like Thai Buddhist Era, Japanese Imperial Era, and Islamic Hijri. Chronera addresses this by using a universal integer pivot called AbsoluteDay — counting days from the Gregorian epoch — so any calendar can convert to and from any other in O(1) time without a combinatorial matrix of custom converters. Each calendar system implements a standardized CalendarAdapter interface, enabling compile-time type discrimination and safe handling of era metadata. The library is designed to be zero-dependency and bundle-friendly, targeting global and regional applications that require legally accurate date semantics.

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