Show r/typescript: Chronera – zero-dep TS date engine with RFC 9557, Temporal ZonedDateTime, multi-cultural calendars

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Hey everyone! 👋 Working with dates in JavaScript has always been notoriously tricky. While TC39 Temporal is exciting, full engine availability is still on the horizon. Meanwhile, handling multi-cultural calendars (Buddhist, Hijri, Solar) and cross-border settlement holidays often requires heavy polyfills or fragile custom math. Over the past few weeks, our team built Chronera — an immutable, type-safe date, calendar, and timezone toolkit written strictly in TypeScript with Zero Runtime Dependencies.

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