feat: Add support for BC dates (negative years in ISO 8601)#12
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Implement parsing and stringification of BC dates using ISO 8601 extended
year format with negative year numbers. This follows the astronomical year
numbering system where year 0 = 1 BC, year -1 = 2 BC, etc.
Changes:
- Parser: Handle optional leading dash before year component
- Stringify: Format negative years with proper padding (e.g., -0044)
- Add comprehensive test coverage for BC dates, including:
- Full dates, year-month, and year-only formats
- Year 0 (1 BC in proleptic Gregorian calendar)
- BC dates with time and timezone components
- Round-trip parsing and stringification
Examples:
- parseTemporal('-0044-03-15') → year: -44 (44 BC)
- parseTemporal('0000-01-01') → year: 0 (1 BC)
- stringifyDate({ year: -44, month: 3, day: 15 }) → '-0044-03-15'
The implementation maintains backward compatibility and follows ISO 8601:2004
extended year format specification.
🦋 Changeset detectedLatest commit: 50b3e8e The changes in this PR will be included in the next version bump. This PR includes changesets to release 1 package
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Implement parsing and stringification of BC dates using ISO 8601 extended year format with negative year numbers. This follows the astronomical year numbering system where year 0 = 1 BC, year -1 = 2 BC, etc.
Changes:
Examples:
The implementation maintains backward compatibility and follows ISO 8601:2004 extended year format specification.