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Changelog

All notable changes to this project are documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

[Unreleased]

1.3.0 - 2026-07-03

Added

  • enhance date validation and normalization functions

Other

  • Refactor error taxonomy (#27)
  • clarify lunar date ordering behavior in comments
  • add self-standing invariant tests for lunar-lite functionality
  • update comments and clarify behavior

1.2.1 - 2026-06-29

Other

  • remove tests from crate inclusion (#23)

1.2.0 - 2026-06-29

Added

  • expose exact LiChun datetime (#21)

1.1.0 - 2026-06-28

Added

  • use tyme-compatible astronomical conversion (#19)
  • add lunar month helpers (#14)

Other

  • add broad tyme4rs oracle compatibility suite (#20)

Breaking

  • Replaced the generated lunar-year and solar-term conversion tables with a tyme-compatible astronomical backend. Conversion results may differ from the previous lunar-typescript table-derived backend.
  • Solar date validation now follows tyme-compatible Julian/Gregorian reform semantics: solar years 1..=9999, Julian-calendar semantics before 1582-10-15, and the invalid Gregorian reform gap 1582-10-05..=1582-10-14.
  • Full lunar-to-solar conversion now requires the resulting solar date to fall within solar years 1..=9999. Lunar-month fact APIs still accept lunar years -1..=9999.

Changed

  • Replaced generated lunar-year and solar-term conversion tables with a small internal astronomical backend for new-moon and solar-term calculation, with tyme4rs-compatible calendar behaviour. Portions of the kernel are adapted from MIT-licensed 6tail/tyme4rs; see THIRD_PARTY_LICENSES.md.
  • Conversion support now follows tyme-compatible policy: solar years 1..=9999, Julian-calendar semantics before 1582-10-15, and the invalid Gregorian reform gap 1582-10-05..=1582-10-14.
  • The astronomical kernel's raw data now lives as reviewable source files under data/astronomical/ and is compiled into typed constants by build.rs at build time. No runtime file I/O or parsing is added, public API and numerical behaviour are unchanged, and the data files are shipped in the crate package so the build works from crates.io.

Fixed

  • Four-pillar exact-mode instants are built on the Julian Day so user dates and Jie solar-term boundaries share one Julian/Gregorian calendar policy; pre-reform Julian leap days (e.g. 1500-02-29) no longer collapse onto the next day.
  • Lunar-month facts (leap_month, lunar_month_days) now resolve for the lowest supported lunar year -1 instead of failing on an out-of-range previous-year lookup. Full lunar-to-solar conversion still requires the resulting solar date to fall in 1..=9999.

Added

  • THIRD_PARTY_LICENSES.md reproducing the upstream MIT notice for the adapted astronomical kernel, included in crate packaging.

1.0.0 - 2026-06-12

Other

  • expand design overview

0.3.2 - 2026-06-12

Fixed

  • add missing badges for Crates.io version and downloads in README.md (#10)

0.3.1 - 2026-06-12

Fixed

  • correct crates.io badge URL for downloads (#9)