Enable Intl.Era-monthcode and implement 7 new calendar systems (+2,498 test262 passes) by lahma · Pull Request #2344 · sebastienros/jint (original) (raw)
and others added 3 commits
…lendars (+2,362 test262 passes)
- Remove Intl.Era-monthcode from ExcludedFeatures, enabling ~3,000 new test cases
- Implement Coptic, Ethiopic, EthioAA calendars (13-month epoch-day arithmetic)
- Implement Indian (Saka) calendar with March 22 new year
- Implement Islamic Umm al-Qura calendar via .NET UmAlQuraCalendar
- Move Islamic Civil/Tbla from TemporalHelpers to NonIsoCalendars with full CalendarDateAdd/CalendarDateUntil support
- Fix Buddhist/ROC year conversion in CalendarDateToISO and PlainYearMonth
- Fix Japanese era determination to use full date boundaries (month/day)
- Fix Islamic epoch consistency (off-by-one) and tbla IsoToCalendarDate epoch
- Fix Islamic month extraction to match forward JDN formula
- Fix backward month counting in CalendarDateUntil for cross-year differences
- Fix CalendarDateUntil wrapping-at-end-of-month for constrained days
- Support era/eraYear in with() for PlainDate, PlainDateTime, PlainYearMonth
- Route buddhist/roc/japanese with() through CalendarDateToISO
Result: 95,662 passed (+2,362), 0 failures, 362 remaining era exclusions
Co-Authored-By: Claude Opus 4.6 (1M context) noreply@anthropic.com
…ing (+148 tests)
- Fix backward month counting direction in CalendarDateUntil
- Fix year wrapping: constrained day prevents counting a full year
- Fix month wrapping: constrained day prevents counting a full month (matches ISO ISODateSurpasses behavior for non-ISO calendars)
- Replace Islamic ceil(29.5001) month approximation with exact cumulative month lengths (30,29,30,29...) in both forward and inverse conversion
- Fix month extraction in IslamicCivilToCalendarDate to use cumulative month boundaries matching IslamicToJdn
Result: 95,810 passed (+2,510 from baseline), 288 remaining era exclusions
Co-Authored-By: Claude Opus 4.6 (1M context) noreply@anthropic.com
…onths
- Year constraining now checks MonthCode (not ordinal Month) to properly detect leap month constraining (e.g., M05L → M05 when target year has no leap month should not count as 1 year)
- Month constraining checks day direction to detect day-at-end-of-month wrapping without false positives for intercalary month transitions
Result: 95,798 passed (+2,498 from baseline), 294 remaining era exclusions
Co-Authored-By: Claude Opus 4.6 (1M context) noreply@anthropic.com
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Mar 23, 2026
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