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spec.emu
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<!doctype html>
<meta charset="utf8">
<link rel="stylesheet" href="./spec.css">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/8.4/styles/github.min.css">
<script src="./spec.js"></script>
<pre class="metadata">
title: Intl era and monthCode Proposal
stage: 2
location: https://frankyftang.github.io/proposal-intl-era-monthcode/
copyright: true
contributors: Google, Ecma International
</pre>
<emu-clause id="sup-temporal-calendar-abstract-ops">
<h1>Abstract Operations for Temporal.Calendar Objects</h1>
<emu-clause id="sec-temporal-iscalendarsupportera" type="abstract operation">
<h1>
IsCalendarSupportEra (
_calendar_: a String,
): a Boolean
</h1>
<dl class="header">
<dt>description</dt>
<dd>
The following algorithm refers to the era data from <a href="https://unicode.org/reports/tr35/tr35-dates.html#Calendar_Data">UTS 35's Supplemental Calendar Data</a>.
</dd>
</dl>
<emu-alg>
1. If _calendar_ is listed in the Calendar column of <emu-xref href="#table-eras"></emu-xref>, return *true*.
1. Return *false*.
</emu-alg>
<emu-table id="table-eras">
<emu-caption>era aliases and range of eraYear</emu-caption>
<table class="real-table">
<thead>
<tr>
<th>Calendar</th>
<th>Era</th>
<th>Aliases</th>
<th>Minimum eraYear</th>
<th>Maximum eraYear</th>
</tr>
</thead>
<tr>
<td>*"buddhist"*</td>
<td>*"buddhist"*</td>
<td>*"be"*</td>
<td>*-∞*<sub>𝔽</sub></td>
<td>*+∞*<sub>𝔽</sub></td>
</tr>
<tr>
<td>*"chinese"*</td>
<td>*"chinese"*</td>
<td></td>
<td>*-∞*<sub>𝔽</sub></td>
<td>*+∞*<sub>𝔽</sub></td>
</tr>
<tr>
<td>*"coptic"*</td>
<td>*"coptic"*</td>
<td></td>
<td>*1*<sub>𝔽</sub></td>
<td>*+∞*<sub>𝔽</sub></td>
</tr>
<tr>
<td>*"coptic"*</td>
<td>*"coptic-inverse"*</td>
<td></td>
<td>*1*<sub>𝔽</sub></td>
<td>*+∞*<sub>𝔽</sub></td>
</tr>
<tr>
<td>*"dangi"*</td>
<td>*"dangi"*</td>
<td></td>
<td>*-∞*<sub>𝔽</sub></td>
<td>*+∞*<sub>𝔽</sub></td>
</tr>
<tr>
<td>*"ethiopic"*</td>
<td>*"ethiopic"*</td>
<td>*"incar"*</td>
<td>*1*<sub>𝔽</sub></td>
<td>*+∞*<sub>𝔽</sub></td>
</tr>
<tr>
<td>*"ethiopic"*</td>
<td>*"ethioaa"*</td>
<td>*"ethiopic-amete-alem"*, *"mundi"*</td>
<td>*-∞*<sub>𝔽</sub></td>
<td>*5500*<sub>𝔽</sub></td>
</tr>
<tr>
<td>*"ethioaa"*</td>
<td>*"ethioaa"*</td>
<td>*"ethiopic-amete-alem"*, *"mundi"*</td>
<td>*-∞*<sub>𝔽</sub></td>
<td>*+∞*<sub>𝔽</sub></td>
</tr>
<tr>
<td>*"gregory"*</td>
<td>*"gregory"*</td>
<td>*"ce"*, *"ad"*</td>
<td>*1*<sub>𝔽</sub></td>
<td>*+∞*<sub>𝔽</sub></td>
</tr>
<tr>
<td>*"gregory"*</td>
<td>*"gregory-inverse"*</td>
<td>*"bc"*, *"bce"*</td>
<td>*1*<sub>𝔽</sub></td>
<td>*+∞*<sub>𝔽</sub></td>
</tr>
<tr>
<td>*"hebrew"*</td>
<td>*"hebrew"*</td>
<td>*"am"*</td>
<td>*-∞*<sub>𝔽</sub></td>
<td>*+∞*<sub>𝔽</sub></td>
</tr>
<tr>
<td>*"indian"*</td>
<td>*"indian"*</td>
<td>*"saka"*</td>
<td>*-∞*<sub>𝔽</sub></td>
<td>*+∞*<sub>𝔽</sub></td>
</tr>
<tr>
<td>*"islamic"*</td>
<td>*"islamic"*</td>
<td>*"ah"*</td>
<td>*-∞*<sub>𝔽</sub></td>
<td>*+∞*<sub>𝔽</sub></td>
</tr>
<tr>
<td>*"islamic-civil"*</td>
<td>*"islamic-civil"*</td>
<td>*"islamicc"*, *"ah"*</td>
<td>*-∞*<sub>𝔽</sub></td>
<td>*+∞*<sub>𝔽</sub></td>
</tr>
<tr>
<td>*"islamic-rgsa"*</td>
<td>*"islamic-rgsa"*</td>
<td>*"ah"*</td>
<td>*-∞*<sub>𝔽</sub></td>
<td>*+∞*<sub>𝔽</sub></td>
</tr>
<tr>
<td>*"islamic-tbla"*</td>
<td>*"islamic-tbla"*</td>
<td>*"ah"*</td>
<td>*-∞*<sub>𝔽</sub></td>
<td>*+∞*<sub>𝔽</sub></td>
</tr>
<tr>
<td>*"islamic-umalqura"*</td>
<td>*"islamic-umalqura"*</td>
<td>*"ah"*</td>
<td>*-∞*<sub>𝔽</sub></td>
<td>*+∞*<sub>𝔽</sub></td>
</tr>
<tr>
<td>*"japanese"*</td>
<td>*"heisei"*</td>
<td></td>
<td>*1*<sub>𝔽</sub></td>
<td>*31*<sub>𝔽</sub></td>
</tr>
<tr>
<td>*"japanese"*</td>
<td>*"japanese"*</td>
<td>*"gregory"*, *"ad"*, *"ce"*</td>
<td>*1*<sub>𝔽</sub></td>
<td>*1868*<sub>𝔽</sub></td>
</tr>
<tr>
<td>*"japanese"*</td>
<td>*"japanese-inverse"*</td>
<td>*"gregory-inverse"*, *"bc"*, *"bce"*</td>
<td>*1*<sub>𝔽</sub></td>
<td>*+∞*<sub>𝔽</sub></td>
</tr>
<tr>
<td>*"japanese"*</td>
<td>*"meiji"*</td>
<td></td>
<td>*1*<sub>𝔽</sub></td>
<td>*45*<sub>𝔽</sub></td>
</tr>
<tr>
<td>*"japanese"*</td>
<td>*"reiwa"*</td>
<td></td>
<td>*1*<sub>𝔽</sub></td>
<td>*+∞*<sub>𝔽</sub></td>
</tr>
<tr>
<td>*"japanese"*</td>
<td>*"showa"*</td>
<td></td>
<td>*1*<sub>𝔽</sub></td>
<td>*64*<sub>𝔽</sub></td>
</tr>
<tr>
<td>*"japanese"*</td>
<td>*"taisho"*</td>
<td></td>
<td>*1*<sub>𝔽</sub></td>
<td>*15*<sub>𝔽</sub></td>
</tr>
<tr>
<td>*"persian"*</td>
<td>*"persian"*</td>
<td>*"ap"*</td>
<td>*-∞*<sub>𝔽</sub></td>
<td>*+∞*<sub>𝔽</sub></td>
</tr>
<tr>
<td>*"roc"*</td>
<td>*"roc"*</td>
<td>*"minguo"**</td>
<td>*1*<sub>𝔽</sub></td>
<td>*+∞*<sub>𝔽</sub></td>
</tr>
<tr>
<td>*"roc"*</td>
<td>*"roc-inverse"*</td>
<td>*"before-roc"*</td>
<td>*1*<sub>𝔽</sub></td>
<td>*+∞*<sub>𝔽</sub></td>
</tr>
</table>
</emu-table>
<emu-note>
The content in this table is proposed by Era Code WG to CLDR TC in <a href="https:/unicode-org/cldr/pull/2665">PR 2665</a> and under review. It is targeted to be part of CLDR 43, scheduled to be released in April 2023.
</emu-note>
</emu-clause>
<emu-clause id="sec-temporal-canonicalizeeraincalendar" type="abstract operation">
<h1>
CanonicalizeEraInCalendar (
_calendar_: a String,
_era_: a String,
): a String or *undefined*
</h1>
<dl class="header">
<dt>description</dt>
<dd>
The following algorithm refers to the era data from <a href="https://unicode.org/reports/tr35/tr35-dates.html#Calendar_Data">UTS 35's Supplemental Calendar Data</a>.
</dd>
</dl>
<emu-alg>
1. For each row of <emu-xref href="#table-eras"></emu-xref>, do
1. Let _cal_ be the Calendar value of the current row.
1. If _cal_ is equal to _calendar_, then
1. Let _e_ be the Era value of the current row.
1. If _e_ is equal to _era_, return _era_.
1. Let _aliases_ be a List whose elements are the strings given in the Aliases column of the row.
1. If _aliases_ contains _era_, return _era_.
1. Return *undefined*.
</emu-alg>
</emu-clause>
<emu-clause id="sec-temporal-isvalidmonthecodeforcalendar" type="abstract operation">
<h1>
IsValidMonthCodeForCalendar (
_calendar_: a String,
_monthCode_: a String,
): a Boolean
</h1>
<dl class="header">
</dl>
<emu-alg>
1. Let _commonMonthCodes_ be « *"M01"*, *"M02"*, *"M03"*, *"M04"*, *"M05"*, *"M06"*, *"M07"*, *"M08"*, *"M09"*, *"M10"*, *"M11"*, *"M12"* ».
1. If _commonMonthCodes_ contains _monthCode_, return *true*.
1. If _calendar_ is not listed in the Calendar column of <emu-xref href="#table-additional-month-codes"></emu-xref>, return *false*.
1. Let _r_ be the row in <emu-xref href="#table-additional-month-codes"></emu-xref> which the _clendar_ is in the Calendar column.
1. Let _specialMonthCodes_ be a List whose elements are the strings given in the *"Additional Month Codes"* column of _r_.
1. If _specialMonthCodes_ contains _monthCode_, return *true*.
1. Return *false*.
</emu-alg>
<emu-table id="table-additional-month-codes">
<emu-caption>Additional Month Codes in Calendars</emu-caption>
<table class="real-table">
<thead>
<tr>
<th>Calendar</th>
<th>Additional Month Codes</th>
</tr>
</thead>
<tr>
<td>*"chinese"*</td>
<td>*"M01L"*, *"M02L"*, *"M03L"*, *"M04L"*, *"M05L"*, *"M06L"*, *"M07L"*, *"M08L"*, *"M09L"*, *"M10L"*, *"M11L"*, *"M12L"*</td>
</tr>
<tr>
<td>*"coptic"*</td>
<td>*"M13"*</td>
</tr>
<tr>
<td>*"dangi"*</td>
<td>*"M01L"*, *"M02L"*, *"M03L"*, *"M04L"*, *"M05L"*, *"M06L"*, *"M07L"*, *"M08L"*, *"M09L"*, *"M10L"*, *"M11L"*, *"M12L"*</td>
</tr>
<tr>
<td>*"ethiopic"*</td>
<td>*"M13"*</td>
</tr>
<tr>
<td>*"ethioaa"*</td>
<td>*"M13"*</td>
</tr>
<tr>
<td>*"hebrew"*</td>
<td>*"M05L"*</td>
</tr>
</table>
</emu-table>
</emu-clause>
<emu-clause id="sec-temporal-isvaliderayearforcalendar" type="abstract operation">
<h1>
IsValidEraYearForCalendar (
_calendar_: a String,
_era_: a String,
_eraYear_: a integer,
): a Boolean
</h1>
<dl class="header">
<dt>description</dt>
<dd>
The following algorithm refers to the era data from <a href="https://unicode.org/reports/tr35/tr35-dates.html#Calendar_Data">UTS 35's Supplemental Calendar Data</a>.
</dd>
</dl>
<emu-alg>
1. Let _era_ be CanonicalizeEraInCalendar(_calendar_, _era_).
1. If _era_ is *undefined*, return *false*.
1. Let _r_ be the row in <emu-xref href="#table-eras"></emu-xref> which the _calendar_ is in the Calendar column and the _era_ is in the Era column.
1. Let _min_ be the value given in the *"Minimum eraYear"* column of _r_.
1. Let _max_ be the value given in the *"Maximum eraYear"* column of _r_.
1. If _eraYear_ < _min_, return *false*.
1. If _eraYear_ > _max_, return *false*.
1. Return *true*.
</emu-alg>
</emu-clause>
<emu-clause id="sup-temporal-calendardateera" type="abstract operation">
<h1>
CalendarDateEra (
_calendar_: a String,
_date_: a Temporal.PlainDateTime, Temporal.PlainDate, or Temporal.PlainYearMonth,
): a String or *undefined*
</h1>
<dl class="header">
<dt>description</dt>
<dd>It performs implementation-defined processing to find the era for the date corresponding to _date_ in the context of the calendar represented by _calendar_ and returns a lowercase String value representing that era, or *undefined* for calendars that do not have eras.</dd>
</dl>
<p>
This definition supersedes the definition provided in "Temporal proposal", #sec-temporal-calendardateera.
</p>
<emu-alg>
1. If IsCalendarSupportEra(_calendar_) is *false*, return *undefined*.
1. Let _era_ be the String to indicate the era corresponding to _date_ in the context of the calendar represented by _calendar_ from an implementation-defined processing.
1. Return CanonicalizeEraInCalendar(_calendar_, _era_).
</emu-alg>
</emu-clause>
<emu-clause id="sup-temporal-calendardateerayear" type="abstract operation">
<h1>
CalendarDateEraYear (
_calendar_: a String,
_date_: a Temporal.PlainDateTime, Temporal.PlainDate, or Temporal.PlainYearMonth,
): an integer or *undefined*
</h1>
<dl class="header">
<dt>description</dt>
<dd>It performs implementation-defined processing to find the era for the date corresponding to _date_ in the context of the calendar represented by _calendar_ and returns an integer representing the ordinal position of the year of _date_ in that era, or *undefined* for calendars that do not have eras.</dd>
</dl>
</dl>
<p>
This definition supersedes the definition provided in "Temporal proposal", #sec-temporal-calendardateerayear.
</p>
<emu-alg>
1. If IsCalendarSupportEra(_calendar_) is *false*, return *undefined*.
1. Let _eraYear_ be the integer to indicate the era year corresponding to _date_ in the context of the calendar represented by _calendar_ from an implementation-defined processing.
1. Assert: _eraYear_ is an integer.
1. Return _eraYear_.
</emu-alg>
<emu-note>
Era years are 1-indexed for many calendars, but not all (e.g., the eras of the Burmese calendar each start with a year 0). Years can also advance opposite the flow of time (as for BCE years in the Gregorian calendar).
</emu-note>
</emu-clause>
<emu-clause id="sup-temporal-calendardatefields" type="abstract operation">
<h1>
CalendarDateFields (
_calendar_: a String,
_fields_: a List of Strings,
): a List of Strings
</h1>
<dl class="header">
<dt>description</dt>
<dd>It takes a list of standard fields in _fields_ that are necessary for a given operation and returns a new list by adding relevant calendar-specific fields for the calendar represented by _calendar_. This is relevant for calendars which accept fields other than the standard set of built-in calendar fields.</dd>
</dl>
</dl>
<p>
This definition supersedes the definition provided in "Temporal proposal", #sec-temporal-calendardatefields.
</p>
<emu-alg>
1. If _fields_ contains an element equal to *"year"* and IsCalendarSupportEra(_calendar_) is *true*, then
1. Append *"era"* to _fields_.
1. Append *"eraYear"* to _fields_.
1. Return _fields_.
</emu-alg>
</emu-clause>
<emu-clause id="sup-temporal-calendardatemergefields" type="abstract operation">
<h1>
CalendarDateMergeFields (
_calendar_: a String,
_fields_: an Object,
_additionalFields_: an Object,
): either a normal completion containing an Object or an abrupt completion
</h1>
<dl class="header">
<dt>description</dt>
<dd>It takes two Objects of calendar-specific fields for the calendar represented by _calendar_ in _fields_ and _additionalFields_ and returns a new Object that includes both sets of fields. The values in _additionalFields_ should supersede the values in _fields_. Also, the returned Object must be free of ambiguity or conflicts. This is relevant for calendars which accept fields other than the standard set of built-in calendar fields.</dd>
</dl>
<p>
This definition supersedes the definition provided in "Temporal proposal", #sec-temporal-calendardatemergefields.
</p>
<emu-note>
For example, if _fields_ contains *"year"* but _additionalFields_ contains *"era"* and *"eraYear"*, then the returned list must not include *"year"* in order to avoid ambiguity or conflict between different ways of specifying the year.
</emu-note>
<emu-alg>
1. Let _handleEra_ be IsCalendarSupportEra(_calendar_).
1. Let _merged_ be OrdinaryObjectCreate(%Object.prototype%).
1. Let _fieldsKeys_ be ? EnumerableOwnPropertyNames(_fields_, ~key~).
1. For each element _key_ of _fieldsKeys_, do
1. If _key_ is not *"month"* or *"monthCode"*, then
1. If _handlEra_ is *false* or _key_ is not *"era"*, *"eraYear"* or *"year"*, then
1. Let _propValue_ be ? Get(_fields_, _key_).
1. If _propValue_ is not *undefined*, then
1. Perform ! CreateDataPropertyOrThrow(_merged_, _key_, _propValue_).
1. Let _additionalFieldsKeys_ be ? EnumerableOwnPropertyNames(_additionalFields_, ~key~).
1. For each element _key_ of _additionalFieldsKeys_, do
1. Let _propValue_ be ? Get(_additionalFields_, _key_).
1. If _propValue_ is not *undefined*, then
1. Perform ! CreateDataPropertyOrThrow(_merged_, _key_, _propValue_).
1. If _additionalFieldsKeys_ does not contain either *"month"* or *"monthCode"*, then
1. Let _month_ be ? Get(_fields_, *"month"*).
1. If _month_ is not *undefined*, then
1. Perform ! CreateDataPropertyOrThrow(_merged_, *"month"*, _month_).
1. Let _monthCode_ be ? Get(_fields_, *"monthCode"*).
1. If _monthCode_ is not *undefined*, then
1. Perform ! CreateDataPropertyOrThrow(_merged_, *"monthCode"*, _monthCode_).
1. If _handleEra_ is *true*, then
1. If _additionalFieldsKeys_ does not contain *"era"*, *"eraYear"*, or *"year"*, then
1. Let _year_ be ? Get(_fields_, *"year"*).
1. If _year_ is not *undefined*, then
1. Perform ! CreateDataPropertyOrThrow(_merged_, *"year"*, _year_).
1. Return _merged_.
</emu-alg>
</emu-clause>
</emu-clause>