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Normative: Temporal and Intl Era/Month Code stage 4 #1044

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d9dfd09
Normative: Temporal stage 4
ptomato Feb 16, 2026
36fa763
TEMP: Move CanonicalizeUValue to ECMA-262
ptomato Feb 21, 2026
4359e61
Normative: Intl Era/Month Code stage 4
ptomato Feb 21, 2026
9d19c9a
(fixup) Reinstate GetOption
ptomato Feb 25, 2026
4cf4fac
(optional) Reinstate CanonicalizeUValue and override CanonicalizeCale…
ptomato Feb 25, 2026
0f2a5e6
(fixup) Fix assertion failure in NonISOCalendarDateToISO
ptomato Feb 25, 2026
403dca8
(fixup) Express epoch nanoseconds in mathematical values
ptomato Feb 26, 2026
9e1b067
(fixup) Assertions in NonISOResolveFields/NonISOMonthDay
ptomato Mar 5, 2026
4db49a4
(fixup) Fix cut-off sentence
ptomato Mar 10, 2026
2fff84b
(fixup) Clarify early throw in NonISOMonthDayToISOReferenceDate
ptomato Mar 10, 2026
372edaf
(fixup) Use curly quotes for table column names
ptomato Mar 12, 2026
19d6318
(fixup) Make explicit algorithm steps for AvailableCalendars
ptomato Mar 12, 2026
ac5929d
(fixup) Improvements to toLocaleStringTimeZone in CreateDateTimeFormat
ptomato Mar 12, 2026
cf8bee7
(fixup) Return "the" Value Format Record
ptomato Mar 12, 2026
ffce532
(fixup) Inline Value Format Record AOs
ptomato Mar 12, 2026
2bd1d9c
(fixup) Various phrasing adjustments
ptomato Mar 12, 2026
b44fc54
(fixup) Extra clarification on [[LocaleData]].[[<locale>]].[[ca]]
ptomato Mar 31, 2026
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6 changes: 6 additions & 0 deletions spec/annexes.html
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Expand Up @@ -181,6 +181,12 @@ <h1>Implementation Dependent Behaviour</h1>
</li>
</ul>
</li>
<li>
In Temporal:
<ul>
<li>The calendrical calculations used for calendars other than *"iso8601"* (<emu-xref href="#sec-calendar-abstract-ops"></emu-xref>)</li>
</ul>
</li>
</ul>
</emu-annex>

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443 changes: 348 additions & 95 deletions spec/datetimeformat.html
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225 changes: 17 additions & 208 deletions spec/durationformat.html
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Expand Up @@ -308,15 +308,15 @@ <h1>Intl.DurationFormat.prototype.resolvedOptions ( )</h1>
</emu-clause>

<emu-clause id="sec-Intl.DurationFormat.prototype.format">
<h1>Intl.DurationFormat.prototype.format ( _duration_ )</h1>
<h1>Intl.DurationFormat.prototype.format ( _durationLike_ )</h1>

<p>When the `format` method is called with an argument _duration_, the following steps are taken:</p>
<p>When the `format` method is called with an argument _durationLike_, the following steps are taken:</p>

<emu-alg>
1. Let _df_ be the *this* value.
1. Perform ? RequireInternalSlot(_df_, [[InitializedDurationFormat]]).
1. Let _record_ be ? ToDurationRecord(_duration_).
1. Let _parts_ be PartitionDurationFormatPattern(_df_, _record_).
1. Let _duration_ be ? ToTemporalDuration(_durationLike_).
1. Let _parts_ be PartitionDurationFormatPattern(_df_, _duration_).
1. Let _result_ be the empty String.
1. For each Record { [[Type]], [[Value]], [[Unit]] } _part_ in _parts_, do
1. Set _result_ to the string-concatenation of _result_ and _part_.[[Value]].
Expand All @@ -325,15 +325,15 @@ <h1>Intl.DurationFormat.prototype.format ( _duration_ )</h1>
</emu-clause>

<emu-clause id="sec-Intl.DurationFormat.prototype.formatToParts">
<h1>Intl.DurationFormat.prototype.formatToParts ( _duration_ )</h1>
<h1>Intl.DurationFormat.prototype.formatToParts ( _durationLike_ )</h1>

<p>When the `formatToParts` method is called with an argument _duration_, the following steps are taken:</p>
<p>When the `formatToParts` method is called with an argument _durationLike_, the following steps are taken:</p>

<emu-alg>
1. Let _df_ be the *this* value.
1. Perform ? RequireInternalSlot(_df_, [[InitializedDurationFormat]]).
1. Let _record_ be ? ToDurationRecord(_duration_).
1. Let _parts_ be PartitionDurationFormatPattern(_df_, _record_).
1. Let _duration_ be ? ToTemporalDuration(_durationLike_).
1. Let _parts_ be PartitionDurationFormatPattern(_df_, _duration_).
1. Let _result_ be ! ArrayCreate(0).
1. Let _n_ be 0.
1. For each Record { [[Type]], [[Value]], [[Unit]] } _part_ in _parts_, do
Expand Down Expand Up @@ -385,197 +385,6 @@ <h1>Properties of Intl.DurationFormat Instances</h1>
<emu-clause id="sec-intl-durationformat-abstracts">
<h1>Abstract Operations for DurationFormat Objects</h1>

<emu-clause id="sec-duration-records">
<h1>Duration Records</h1>
<p>A <dfn variants="Duration Records">Duration Record</dfn> is a Record value used to represent a Duration.</p>
<p>Duration Records have the fields listed in <emu-xref href="#table-duration-record-fields"></emu-xref></p>
<emu-table id="table-duration-record-fields" caption="Duration Record Fields">
<table class="real-table">
<tr>
<th>Field</th>
<th>Meaning</th>
</tr>
<tr>
<td>[[Years]]</td>
<td>
The number of years in the duration.
</td>
</tr>
<tr>
<td>[[Months]]</td>
<td>
The number of months in the duration.
</td>
</tr>
<tr>
<td>[[Weeks]]</td>
<td>
The number of weeks in the duration.
</td>
</tr>
<tr>
<td>[[Days]]</td>
<td>
The number of days in the duration.
</td>
</tr>
<tr>
<td>[[Hours]]</td>
<td>
The number of hours in the duration.
</td>
</tr>
<tr>
<td>[[Minutes]]</td>
<td>
The number of minutes in the duration.
</td>
</tr>
<tr>
<td>[[Seconds]]</td>
<td>
The number of seconds in the duration.
</td>
</tr>
<tr>
<td>[[Milliseconds]]</td>
<td>
The number of milliseconds in the duration.
</td>
</tr>
<tr>
<td>[[Microseconds]]</td>
<td>
The number of microseconds in the duration.
</td>
</tr>
<tr>
<td>[[Nanoseconds]]</td>
<td>
The number of nanoseconds in the duration.
</td>
</tr>
</table>
</emu-table>
</emu-clause>

<emu-clause id="sec-tointegerifintegral" oldids="sec-tointegerwithoutrounding" type="abstract operation">
<h1>
ToIntegerIfIntegral (
_argument_: an ECMAScript language value,
): either a normal completion containing an integer, or a throw completion
</h1>
<dl class="header">
<dt>description</dt>
<dd>It converts _argument_ to an integer representing its Number value, or throws a *RangeError* when that value is not <emu-xref href="#integral-number">integral</emu-xref>.</dd>
</dl>
<emu-alg>
1. Let _number_ be ? ToNumber(_argument_).
1. If _number_ is not an integral Number, throw a *RangeError* exception.
1. Return ℝ(_number_).
</emu-alg>
</emu-clause>

<emu-clause id="sec-todurationrecord" type="abstract operation">
<h1>
ToDurationRecord (
_input_: an ECMAScript language value,
): either a normal completion containing a Duration Record, or a throw completion
</h1>
<dl class="header">
<dt>description</dt>
<dd>It converts a given object that represents a Duration into a Duration Record.</dd>
</dl>

<emu-alg>
1. If _input_ is not an Object, then
1. If _input_ is a String, throw a *RangeError* exception.
1. Throw a *TypeError* exception.
1. Let _result_ be a new Duration Record with each field set to 0.
1. Let _days_ be ? Get(_input_, *"days"*).
1. If _days_ is not *undefined*, set _result_.[[Days]] to ? ToIntegerIfIntegral(_days_).
1. Let _hours_ be ? Get(_input_, *"hours"*).
1. If _hours_ is not *undefined*, set _result_.[[Hours]] to ? ToIntegerIfIntegral(_hours_).
1. Let _microseconds_ be ? Get(_input_, *"microseconds"*).
1. If _microseconds_ is not *undefined*, set _result_.[[Microseconds]] to ? ToIntegerIfIntegral(_microseconds_).
1. Let _milliseconds_ be ? Get(_input_, *"milliseconds"*).
1. If _milliseconds_ is not *undefined*, set _result_.[[Milliseconds]] to ? ToIntegerIfIntegral(_milliseconds_).
1. Let _minutes_ be ? Get(_input_, *"minutes"*).
1. If _minutes_ is not *undefined*, set _result_.[[Minutes]] to ? ToIntegerIfIntegral(_minutes_).
1. Let _months_ be ? Get(_input_, *"months"*).
1. If _months_ is not *undefined*, set _result_.[[Months]] to ? ToIntegerIfIntegral(_months_).
1. Let _nanoseconds_ be ? Get(_input_, *"nanoseconds"*).
1. If _nanoseconds_ is not *undefined*, set _result_.[[Nanoseconds]] to ? ToIntegerIfIntegral(_nanoseconds_).
1. Let _seconds_ be ? Get(_input_, *"seconds"*).
1. If _seconds_ is not *undefined*, set _result_.[[Seconds]] to ? ToIntegerIfIntegral(_seconds_).
1. Let _weeks_ be ? Get(_input_, *"weeks"*).
1. If _weeks_ is not *undefined*, set _result_.[[Weeks]] to ? ToIntegerIfIntegral(_weeks_).
1. Let _years_ be ? Get(_input_, *"years"*).
1. If _years_ is not *undefined*, set _result_.[[Years]] to ? ToIntegerIfIntegral(_years_).
1. If _years_, _months_, _weeks_, _days_, _hours_, _minutes_, _seconds_, _milliseconds_, _microseconds_, and _nanoseconds_ are all *undefined*, throw a *TypeError* exception.
1. If IsValidDuration( _result_.[[Years]], _result_.[[Months]], _result_.[[Weeks]], _result_.[[Days]], _result_.[[Hours]], _result_.[[Minutes]], _result_.[[Seconds]], _result_.[[Milliseconds]], _result_.[[Microseconds]], _result_.[[Nanoseconds]]) is *false*, then
1. Throw a *RangeError* exception.
1. Return _result_.
</emu-alg>
</emu-clause>

<emu-clause id="sec-durationsign" type="abstract operation">
<h1>
DurationSign (
_duration_: a Duration Record,
): -1, 0, or 1
</h1>
<dl class="header">
<dt>description</dt>
<dd>It returns 1 if the most significant non-zero field in the _duration_ argument is positive, and -1 if the most significant non-zero field is negative. If all of _duration_'s fields are zero, it returns 0.</dd>
</dl>
<emu-alg>
1. For each value _v_ of « _duration_.[[Years]], _duration_.[[Months]], _duration_.[[Weeks]], _duration_.[[Days]], _duration_.[[Hours]], _duration_.[[Minutes]], _duration_.[[Seconds]], _duration_.[[Milliseconds]], _duration_.[[Microseconds]], _duration_.[[Nanoseconds]] », do
1. If _v_ &lt; 0, return -1.
1. If _v_ > 0, return 1.
1. Return 0.
</emu-alg>
</emu-clause>

<emu-clause id="sec-isvalidduration" type="abstract operation">
<h1>
IsValidDuration (
_years_: an integer,
_months_: an integer,
_weeks_: an integer,
_days_: an integer,
_hours_: an integer,
_minutes_: an integer,
_seconds_: an integer,
_milliseconds_: an integer,
_microseconds_: an integer,
_nanoseconds_: an integer,
): a Boolean
</h1>
<dl class="header">
<dt>description</dt>
<dd>It returns *true* if its arguments form valid input from which to construct a Duration Record, and *false* otherwise.</dd>
</dl>
<emu-alg>
1. Let _sign_ be 0.
1. For each value _v_ of « _years_, _months_, _weeks_, _days_, _hours_, _minutes_, _seconds_, _milliseconds_, _microseconds_, _nanoseconds_ », do
1. If 𝔽(_v_) is not finite, return *false*.
1. If _v_ &lt; 0, then
1. If _sign_ > 0, return *false*.
1. Set _sign_ to -1.
1. Else if _v_ > 0, then
1. If _sign_ &lt; 0, return *false*.
1. Set _sign_ to 1.
1. If abs(_years_) ≥ 2<sup>32</sup>, return *false*.
1. If abs(_months_) ≥ 2<sup>32</sup>, return *false*.
1. If abs(_weeks_) ≥ 2<sup>32</sup>, return *false*.
1. Let _normalizedSeconds_ be _days_ × 86,400 + _hours_ × 3600 + _minutes_ × 60 + _seconds_ + ℝ(𝔽(_milliseconds_)) × 10<sup>-3</sup> + ℝ(𝔽(_microseconds_)) × 10<sup>-6</sup> + ℝ(𝔽(_nanoseconds_)) × 10<sup>-9</sup>.
1. NOTE: The above step cannot be implemented directly using floating-point arithmetic. Multiplying by 10<sup>-3</sup>, 10<sup>-6</sup>, and 10<sup>-9</sup> respectively may be imprecise when _milliseconds_, _microseconds_, or _nanoseconds_ is an unsafe integer. This multiplication can be implemented in C++ with an implementation of `std::remquo()` with sufficient bits in the quotient. String manipulation will also give an exact result, since the multiplication is by a power of 10.
1. If abs(_normalizedSeconds_) ≥ 2<sup>53</sup>, return *false*.
1. Return *true*.
</emu-alg>
</emu-clause>

<emu-clause id="sec-getdurationunitoptions" type="abstract operation">
<h1>
GetDurationUnitOptions (
Expand Down Expand Up @@ -667,7 +476,7 @@ <h1>
<h1>
ComputeFractionalDigits (
_durationFormat_: a DurationFormat Object,
_duration_: a Duration Record,
_duration_: a Temporal.Duration,
): a mathematical value
</h1>
<dl class="header">
Expand All @@ -679,11 +488,11 @@ <h1>
1. Let _result_ be 0.
1. Let _exponent_ be 3.
1. For each row of <emu-xref href="#table-partition-duration-format-pattern"></emu-xref>, except the header row, in table order, do
1. Let _unitOptions_ be the value of _durationFormat_'s internal slot whose name is the Internal Slot value of the current row.
1. Let _unitOptions_ be the value of _durationFormat_'s internal slot whose name is the “Formatter Internal Slot” value of the current row.
1. If _unitOptions_.[[Style]] is *"fractional"*, then
1. Let _unit_ be the Unit value of the current row.
1. Assert: IsFractionalSecondUnitName(_unit_) is *true*.
1. Let _value_ be the value of _duration_'s field whose name is the Value Field value of the current row.
1. Let _value_ be the value of _duration_'s internal slot whose name is the “Duration Internal Slot” value of the current row.
1. Set _result_ to _result_ + (_value_ / 10<sup>_exponent_</sup>).
1. Set _exponent_ to _exponent_ + 3.
1. Return _result_.
Expand Down Expand Up @@ -829,7 +638,7 @@ <h1>
<h1>
FormatNumericUnits (
_durationFormat_: a DurationFormat Object,
_duration_: a Duration Record,
_duration_: a Temporal.Duration,
_firstNumericUnit_: a String,
_signDisplayed_: a Boolean,
): a List of Records
Expand Down Expand Up @@ -946,7 +755,7 @@ <h1>
<h1>
PartitionDurationFormatPattern (
_durationFormat_: a DurationFormat,
_duration_: a Duration Record,
_duration_: a Temporal.Duration,
): a List
</h1>
<dl class="header">
Expand All @@ -959,8 +768,8 @@ <h1>
1. Let _signDisplayed_ be *true*.
1. Let _numericUnitFound_ be *false*.
1. While _numericUnitFound_ is *false*, repeat for each row in <emu-xref href="#table-partition-duration-format-pattern"></emu-xref> in table order, except the header row:
1. Let _value_ be the value of _duration_'s field whose name is the Value Field value of the current row.
1. Let _unitOptions_ be the value of _durationFormat_'s internal slot whose name is the Internal Slot value of the current row.
1. Let _value_ be the value of _duration_'s internal slot whose name is the “Duration Internal Slot” value of the current row.
1. Let _unitOptions_ be the value of _durationFormat_'s internal slot whose name is the “Formatter Internal Slot” value of the current row.
1. Let _style_ be _unitOptions_.[[Style]].
1. Let _display_ be _unitOptions_.[[Display]].
1. Let _unit_ be the Unit value of the current row.
Expand Down Expand Up @@ -1006,8 +815,8 @@ <h1>
<table class="real-table">
<thead>
<tr>
<th>Value Field</th>
<th>Internal Slot</th>
<th>Duration Internal Slot</th>
<th>Formatter Internal Slot</th>
<th>Unit</th>
<th>NumberFormat Unit</th>
</tr>
Expand Down
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