Specify ZonedDateTime.toPlain{YearMonth,MonthDay}()

See: #569
tc39 · Nov 7, 2020 · 93e0d22 · 93e0d22
1 parent 3fd62a1
commit 93e0d22
Showing 1 changed file with 12 additions and 2 deletions.
diff --git a/spec/zoneddatetime.html b/spec/zoneddatetime.html
@@ -888,7 +888,12 @@ <h1>Temporal.ZonedDateTime.prototype.toPlainYearMonth ( )</h1>
         1. Let _timeZone_ be _zonedDateTime_.[[TimeZone]].
         1. Let _instant_ be ? CreateTemporalInstant(_zonedDateTime_.[[Nanoseconds]]).
         1. Let _temporalDateTime_ be ? GetTemporalDateTimeFor(_timeZone_, _instant_).
-        1. Return ? <mark>create via `calendar.yearMonthFromFields()`</mark>.
+        1. Let _calendar_ be _zonedDateTime_.[[Calendar]].
+        1. Let _fieldNames_ be ? CalendarFields(_calendar_, « *"day"*, *"month"*, *"year"* »).
+        1. Let _fields_ be ? ToTemporalDateFields(_temporalDateTime_, _fieldNames_).
+        1. Let _yearMonthFromFields_ be ? Get(_calendar_, *"yearMonthFromFields"*).
+        1. Let _options_ be ? OrdinaryObjectCreate(%Object.prototype%).
+        1. Return ? Call(_yearMonthFromFields_, _calendar_, « _fields_, _options_, %Temporal.PlainMonthDay% »).
       </emu-alg>
     </emu-clause>
 
@@ -903,7 +908,12 @@ <h1>Temporal.ZonedDateTime.prototype.toPlainMonthDay ( )</h1>
         1. Let _timeZone_ be _zonedDateTime_.[[TimeZone]].
         1. Let _instant_ be ? CreateTemporalInstant(_zonedDateTime_.[[Nanoseconds]]).
         1. Let _temporalDateTime_ be ? GetTemporalDateTimeFor(_timeZone_, _instant_).
-        1. Return ? <mark>create via `calendar.monthDayFromFields()`</mark>.
+        1. Let _calendar_ be _zonedDateTime_.[[Calendar]].
+        1. Let _fieldNames_ be ? CalendarFields(_calendar_, « *"day"*, *"month"*, *"year"* »).
+        1. Let _fields_ be ? ToTemporalDateFields(_temporalDateTime_, _fieldNames_).
+        1. Let _monthDayFromFields_ be ? Get(_calendar_, *"monthDayFromFields"*).
+        1. Let _options_ be ? OrdinaryObjectCreate(%Object.prototype%).
+        1. Return ? Call(_monthDayFromFields_, _calendar_, « _fields_, _options_, %Temporal.PlainMonthDay% »).
       </emu-alg>
     </emu-clause>