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Normative: Correct PlainYearMonth arithmetic for non-ISO calendars #2003

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Mar 30, 2022
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Normative: Correct PlainYearMonth arithmetic for non-ISO calendars #2003

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8 changes: 6 additions & 2 deletions spec/plainyearmonth.html
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Original file line number Diff line number Diff line change
Expand Up @@ -256,13 +256,15 @@ <h1>Temporal.PlainYearMonth.prototype.add ( _temporalDurationLike_ [ , _options_
1. Set _options_ to ? GetOptionsObject(_options_).
1. Let _calendar_ be _yearMonth_.[[Calendar]].
1. Let _fieldNames_ be ? CalendarFields(_calendar_, « *"monthCode"*, *"year"* »).
1. Let _fields_ be ? PrepareTemporalFields(_yearMonth_, _fieldNames_, «»).
1. Let _sign_ be ! DurationSign(_duration_.[[Years]], _duration_.[[Months]], _duration_.[[Weeks]], _balanceResult_.[[Days]], 0, 0, 0, 0, 0, 0).
1. If _sign_ &lt; 0, then
1. Let _dayFromCalendar_ be ? CalendarDaysInMonth(_calendar_, _yearMonth_).
1. Let _day_ be ? ToPositiveInteger(_dayFromCalendar_).
1. Else,
1. Let _day_ be 1.
1. Let _date_ be ? CreateTemporalDate(_yearMonth_.[[ISOYear]], _yearMonth_.[[ISOMonth]], _day_, _calendar_).
1. Perform ! CreateDataPropertyOrThrow(_fields_, *"day"*, _day_).
1. Let _date_ be ? DateFromFields(_calendar_, _fields_, *undefined*).
1. Let _durationToAdd_ be ! CreateTemporalDuration(_duration_.[[Years]], _duration_.[[Months]], _duration_.[[Weeks]], _balanceResult_.[[Days]], 0, 0, 0, 0, 0, 0).
1. Let _optionsCopy_ be OrdinaryObjectCreate(%Object.prototype%).
1. Let _entries_ be ? EnumerableOwnPropertyNames(_options_, ~key+value~).
Expand All @@ -289,13 +291,15 @@ <h1>Temporal.PlainYearMonth.prototype.subtract ( _temporalDurationLike_ [ , _opt
1. Set _options_ to ? GetOptionsObject(_options_).
1. Let _calendar_ be _yearMonth_.[[Calendar]].
1. Let _fieldNames_ be ? CalendarFields(_calendar_, « *"monthCode"*, *"year"* »).
1. Let _fields_ be ? PrepareTemporalFields(_yearMonth_, _fieldNames_, «»).
1. Let _sign_ be ! DurationSign(_duration_.[[Years]], _duration_.[[Months]], _duration_.[[Weeks]], _balanceResult_.[[Days]], 0, 0, 0, 0, 0, 0).
1. If _sign_ &lt; 0, then
1. Let _dayFromCalendar_ be ? CalendarDaysInMonth(_calendar_, _yearMonth_).
1. Let _day_ be ? ToPositiveInteger(_dayFromCalendar_).
1. Else,
1. Let _day_ be 1.
1. Let _date_ be ? CreateTemporalDate(_yearMonth_.[[ISOYear]], _yearMonth_.[[ISOMonth]], _day_, _calendar_).
1. Perform ! CreateDataPropertyOrThrow(_fields_, *"day"*, _day_).
1. Let _date_ be ? DateFromFields(_calendar_, _fields_, *undefined*).
1. Let _durationToAdd_ be ! CreateTemporalDuration(_duration_.[[Years]], _duration_.[[Months]], _duration_.[[Weeks]], _balanceResult_.[[Days]], 0, 0, 0, 0, 0, 0).
1. Let _optionsCopy_ be OrdinaryObjectCreate(%Object.prototype%).
1. Let _entries_ be ? EnumerableOwnPropertyNames(_options_, ~key+value~).
Expand Down