Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: 1375d28c26b39005f5ddbfa23087a59e120c1673
      
https://github.com/WebKit/WebKit/commit/1375d28c26b39005f5ddbfa23087a59e120c1673
  Author: Yijia Huang <[email protected]>
  Date:   2026-08-13 (Thu, 13 Aug 2026)

  Changed paths:
    M Source/JavaScriptCore/runtime/temporal/core/CalendarFields.cpp
    M Source/JavaScriptCore/runtime/temporal/core/CalendarICUBridge.cpp

  Log Message:
  -----------
  [JSC][Temporal] Give CalendarMonthDayToISOReferenceDate and 
NonISOMonthDayToISOReferenceDate their own functions
https://bugs.webkit.org/show_bug.cgi?id=321661
rdar://184788558

Reviewed by Yusuke Suzuki.

monthDayFromFields was one function with hand-written ISO and non-ISO branches, 
each re-deriving the
month/day clamp and reference-year logic independently. Split it so each spec 
AO has its own
function (ecmaReferenceYearWithRegularFallback, 
nonISOMonthDayToISOReferenceDate,
monthDayToISOReferenceDate), delegating to nonISOCalendarDateToISO instead of 
re-deriving its logic
by hand, and drops the ISO path's now-unnecessary leap/non-leap proxy-year 
substitution.

Also unifies isoToCalendarFields's roc/buddhist/japanese handling so japanese 
stops opening ICU only
to discard every field it reads, and gives nonISOCalendarDateToISO an 
effectiveMonth fallback for
its one caller that now supplies a monthCode with no ordinal.

No intended behavior change.

Canonical link: https://commits.webkit.org/319104@main



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