Timothy Flynn 34d7a8fa69 LibUnicode: Handle ICU vs ECMA-402 era formatting discrepancies ...

ICU's Islamic calendar implementations always set ERA=0, even for dates
before the Hijra (622 CE), using negative year values instead. However,
the CLDR defines two eras: "Anno Hegirae" (era 0) and "Before Hijrah"
(era 1). ECMA-402 expects distinct era names in formatToParts output.
Similarly, ICU's Coptic calendar has an empty CLDR era 0 name, causing
the era parts to be omitted entirely from formatted output.

This patch adds another icu::Calendar subclass to handle these cases.

2026-03-13 14:43:45 -04:00

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AdjustedEraCalendar.cpp

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AdjustedEraCalendar.h

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ChineseDangiCalendar.cpp

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ChineseDangiCalendar.h

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Constants.h

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