possible to omit calls to CalendarDay and CalendarDateFromFields when…

… doing PlainYearMonth math
tc39 · Sep 10, 2024 · c4cbcb0 · c4cbcb0
1 parent 5d67c89
commit c4cbcb0
Showing 1 changed file with 1 addition and 3 deletions.
diff --git a/polyfill/lib/ecmascript.mjs b/polyfill/lib/ecmascript.mjs
@@ -4409,9 +4409,7 @@ export function AddDurationToOrSubtractDurationFromPlainYearMonth(operation, yea
   let startDate = CalendarDateFromFields(calendar, fields, 'constrain');
   if (sign < 0) {
     const nextMonth = CalendarDateAdd(calendar, startDate, { months: 1 }, 'constrain');
-    const endOfMonth = BalanceISODate(nextMonth.year, nextMonth.month, nextMonth.day - 1);
-    fields.day = CalendarDay(calendar, endOfMonth);
-    startDate = CalendarDateFromFields(calendar, fields, 'constrain');
+    startDate = BalanceISODate(nextMonth.year, nextMonth.month, nextMonth.day - 1);
   }
   RejectDateRange(startDate.year, startDate.month, startDate.day);
   const addedDate = CalendarDateAdd(calendar, startDate, { years, months, weeks, days }, overflow);