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Intl Era Monthcode: Constrain day at end of month in Indian calendar
This adds tests for constraining the day when adding months in the Indian calendar. Adding years is already tested in leap-year-indian.js. Test that 31 gets constrained to 30 in 30-day months.
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‎test/intl402/Temporal/PlainDate/prototype/add/constrain-day-indian.js‎

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// Copyright (C) 2025 Igalia, S.L. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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esid: sec-temporal.plaindate.prototype.add
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description: Constraining the day at end of month (indian calendar)
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includes: [temporalHelpers.js]
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features: [Temporal, Intl.Era-monthcode]
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---*/
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const calendar = "indian";
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const options = { overflow: "reject" };
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// 31-day months: 02-06
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// 30-day months: 07-12
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// Chaitra (01) has 30 days in common years and 31 in leap years
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// See leap-year-indian.js for tests adding years
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const common0231 = Temporal.PlainDate.from({ year: 1944, monthCode: "M02", day: 31, calendar }, options);
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const leap0131 = Temporal.PlainDate.from({ year: 1946, monthCode: "M01", day: 31, calendar }, options);
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const common0231After = Temporal.PlainDate.from({ year: 1947, monthCode: "M02", day: 31, calendar }, options);
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const months1 = new Temporal.Duration(0, 1);
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const months2 = new Temporal.Duration(0, 2);
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const months3 = new Temporal.Duration(0, 3);
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const months4 = new Temporal.Duration(0, 4);
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const months5 = new Temporal.Duration(0, 5);
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const months6 = new Temporal.Duration(0, 6);
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const months7 = new Temporal.Duration(0, 7);
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const months8 = new Temporal.Duration(0, 8);
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const months9 = new Temporal.Duration(0, 9);
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const months10 = new Temporal.Duration(0, 10);
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const months11 = new Temporal.Duration(0, 11);
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const months1n = new Temporal.Duration(0, -1);
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const months2n = new Temporal.Duration(0, -2);
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const months3n = new Temporal.Duration(0, -3);
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const months4n = new Temporal.Duration(0, -4);
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const months5n = new Temporal.Duration(0, -5);
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const months6n = new Temporal.Duration(0, -6);
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const months7n = new Temporal.Duration(0, -7);
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const months8n = new Temporal.Duration(0, -8);
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const months9n = new Temporal.Duration(0, -9);
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const months10n = new Temporal.Duration(0, -10);
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const months11n = new Temporal.Duration(0, -11);
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const months12n = new Temporal.Duration(0, -12);
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const months13n = new Temporal.Duration(0, -13);
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// Common year, forwards
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[
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[months1, 3, "M03"],
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[months2, 4, "M04"],
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[months3, 5, "M05"],
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[months4, 6, "M06"],
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].forEach(function ([months, month, monthCode]) {
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TemporalHelpers.assertPlainDate(
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common0231.add(months, options),
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1944, month, monthCode, 31, `common-year ${monthCode} does not reject 31 when adding`,
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"shaka", 1944);
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});
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[
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[months5, 7, "M07"],
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[months6, 8, "M08"],
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[months7, 9, "M09"],
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[months8, 10, "M10"],
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[months9, 11, "M11"],
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[months10, 12, "M12"],
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].forEach(function ([months, month, monthCode]) {
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TemporalHelpers.assertPlainDate(
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common0231.add(months),
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1944, month, monthCode, 30, `common-year ${monthCode} constrains to 30 when adding`,
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"shaka", 1944);
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assert.throws(RangeError, function () {
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common0231.add(months, options);
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}, `common-year ${monthCode} rejects 31 when adding`);
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});
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TemporalHelpers.assertPlainDate(
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common0231.add(months11),
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1945, 1, "M01", 30, "common-year Chaitra constrains to 30 when adding",
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"shaka", 1945);
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assert.throws(RangeError, function () {
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common0231.add(months11, options);
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}, "common-year Chaitra rejects 31 when adding");
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// Leap year, forwards
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[
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[months1, 2, "M02"],
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[months2, 3, "M03"],
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[months3, 4, "M04"],
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[months4, 5, "M05"],
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[months5, 6, "M06"],
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].forEach(function ([months, month, monthCode]) {
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TemporalHelpers.assertPlainDate(
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leap0131.add(months, options),
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1946, month, monthCode, 31, `leap-year ${monthCode} does not reject 31 when adding`,
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"shaka", 1946);
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});
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[
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[months6, 7, "M07"],
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[months7, 8, "M08"],
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[months8, 9, "M09"],
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[months9, 10, "M10"],
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[months10, 11, "M11"],
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[months11, 12, "M12"],
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].forEach(function ([months, month, monthCode]) {
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TemporalHelpers.assertPlainDate(
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leap0131.add(months),
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1946, month, monthCode, 30, `leap-year ${monthCode} constrains to 30 when adding`,
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"shaka", 1946);
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assert.throws(RangeError, function () {
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leap0131.add(months, options);
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}, `leap-year ${monthCode} rejects 31 when adding`);
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});
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// Common year, backwards
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TemporalHelpers.assertPlainDate(
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common0231.add(months1n),
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1944, 1, "M01", 30, `common-year Chaitra constrains to 30 when subtracting`,
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"shaka", 1944);
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assert.throws(RangeError, function () {
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common0231.add(months1n, options);
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}, "common-year Chaitra rejects 31 when subtracting");
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[
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[months12n, 2, "M02"],
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[months11n, 3, "M03"],
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[months10n, 4, "M04"],
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[months9n, 5, "M05"],
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[months8n, 6, "M06"]
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].forEach(function ([months, month, monthCode]) {
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TemporalHelpers.assertPlainDate(
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common0231.add(months, options),
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1943, month, monthCode, 31, `common-year ${monthCode} does not reject 31 when subtracting`,
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"shaka", 1943);
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});
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[
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[months7n, 7, "M07"],
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[months6n, 8, "M08"],
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[months5n, 9, "M09"],
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[months4n, 10, "M10"],
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[months3n, 11, "M11"],
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[months2n, 12, "M12"],
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].forEach(function ([months, month, monthCode]) {
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TemporalHelpers.assertPlainDate(
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common0231.add(months),
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1943, month, monthCode, 30, `common-year ${monthCode} constrains to 30 when subtracting`,
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"shaka", 1943);
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assert.throws(RangeError, function () {
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common0231.add(months, options);
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}, `common-year ${monthCode} rejects 31 when adding`);
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});
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// Leap year, backwards
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[
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[months13n, 1, "M01"],
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[months12n, 2, "M02"],
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[months11n, 3, "M03"],
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[months10n, 4, "M04"],
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[months9n, 5, "M05"],
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[months8n, 6, "M06"],
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].forEach(function ([months, month, monthCode]) {
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TemporalHelpers.assertPlainDate(
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common0231After.add(months, options),
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1946, month, monthCode, 31, `leap-year ${monthCode} does not reject 31 when subtracting`,
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"shaka", 1946);
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});
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[
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[months7n, 7, "M07"],
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[months6n, 8, "M08"],
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[months5n, 9, "M09"],
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[months4n, 10, "M10"],
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[months3n, 11, "M11"],
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[months2n, 12, "M12"],
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].forEach(function ([months, month, monthCode]) {
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TemporalHelpers.assertPlainDate(
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common0231After.add(months),
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1946, month, monthCode, 30, `leap-year ${monthCode} constrains to 30 when subtracting`,
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"shaka", 1946);
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assert.throws(RangeError, function () {
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common0231After.add(months, options);
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}, `leap-year ${monthCode} rejects 31 when adding`);
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});

‎test/intl402/Temporal/PlainDate/prototype/subtract/constrain-day-indian.js‎

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// Copyright (C) 2025 Igalia, S.L. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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esid: sec-temporal.plaindate.prototype.subtract
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description: Constraining the day at end of month (indian calendar)
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includes: [temporalHelpers.js]
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features: [Temporal, Intl.Era-monthcode]
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---*/
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const calendar = "indian";
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const options = { overflow: "reject" };
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// 31-day months: 02-06
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// 30-day months: 07-12
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// Chaitra (01) has 30 days in common years and 31 in leap years
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// See leap-year-indian.js for tests adding years
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const common0231 = Temporal.PlainDate.from({ year: 1944, monthCode: "M02", day: 31, calendar }, options);
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const leap0131 = Temporal.PlainDate.from({ year: 1946, monthCode: "M01", day: 31, calendar }, options);
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const common0231After = Temporal.PlainDate.from({ year: 1947, monthCode: "M02", day: 31, calendar }, options);
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const months1 = new Temporal.Duration(0, -1);
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const months2 = new Temporal.Duration(0, -2);
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const months3 = new Temporal.Duration(0, -3);
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const months4 = new Temporal.Duration(0, -4);
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const months5 = new Temporal.Duration(0, -5);
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const months6 = new Temporal.Duration(0, -6);
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const months7 = new Temporal.Duration(0, -7);
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const months8 = new Temporal.Duration(0, -8);
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const months9 = new Temporal.Duration(0, -9);
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const months10 = new Temporal.Duration(0, -10);
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const months11 = new Temporal.Duration(0, -11);
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const months1n = new Temporal.Duration(0, 1);
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const months2n = new Temporal.Duration(0, 2);
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const months3n = new Temporal.Duration(0, 3);
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const months4n = new Temporal.Duration(0, 4);
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const months5n = new Temporal.Duration(0, 5);
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const months6n = new Temporal.Duration(0, 6);
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const months7n = new Temporal.Duration(0, 7);
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const months8n = new Temporal.Duration(0, 8);
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const months9n = new Temporal.Duration(0, 9);
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const months10n = new Temporal.Duration(0, 10);
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const months11n = new Temporal.Duration(0, 11);
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const months12n = new Temporal.Duration(0, 12);
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const months13n = new Temporal.Duration(0, 13);
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// Common year, forwards
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[
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[months1, 3, "M03"],
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[months2, 4, "M04"],
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[months3, 5, "M05"],
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[months4, 6, "M06"],
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].forEach(function ([months, month, monthCode]) {
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TemporalHelpers.assertPlainDate(
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common0231.subtract(months, options),
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1944, month, monthCode, 31, `common-year ${monthCode} does not reject 31 when adding`,
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"shaka", 1944);
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});
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[
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[months5, 7, "M07"],
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[months6, 8, "M08"],
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[months7, 9, "M09"],
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[months8, 10, "M10"],
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[months9, 11, "M11"],
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[months10, 12, "M12"],
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].forEach(function ([months, month, monthCode]) {
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TemporalHelpers.assertPlainDate(
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common0231.subtract(months),
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1944, month, monthCode, 30, `common-year ${monthCode} constrains to 30 when adding`,
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"shaka", 1944);
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assert.throws(RangeError, function () {
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common0231.subtract(months, options);
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}, `common-year ${monthCode} rejects 31 when adding`);
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});
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TemporalHelpers.assertPlainDate(
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common0231.subtract(months11),
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1945, 1, "M01", 30, "common-year Chaitra constrains to 30 when adding",
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"shaka", 1945);
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assert.throws(RangeError, function () {
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common0231.subtract(months11, options);
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}, "common-year Chaitra rejects 31 when adding");
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// Leap year, forwards
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[
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[months1, 2, "M02"],
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[months2, 3, "M03"],
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[months3, 4, "M04"],
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[months4, 5, "M05"],
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[months5, 6, "M06"],
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].forEach(function ([months, month, monthCode]) {
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TemporalHelpers.assertPlainDate(
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leap0131.subtract(months, options),
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1946, month, monthCode, 31, `leap-year ${monthCode} does not reject 31 when adding`,
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"shaka", 1946);
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});
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[
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[months6, 7, "M07"],
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[months7, 8, "M08"],
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[months8, 9, "M09"],
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[months9, 10, "M10"],
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[months10, 11, "M11"],
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[months11, 12, "M12"],
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].forEach(function ([months, month, monthCode]) {
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TemporalHelpers.assertPlainDate(
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leap0131.subtract(months),
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1946, month, monthCode, 30, `leap-year ${monthCode} constrains to 30 when adding`,
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"shaka", 1946);
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assert.throws(RangeError, function () {
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leap0131.subtract(months, options);
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}, `leap-year ${monthCode} rejects 31 when adding`);
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});
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// Common year, backwards
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TemporalHelpers.assertPlainDate(
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common0231.subtract(months1n),
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1944, 1, "M01", 30, `common-year Chaitra constrains to 30 when subtracting`,
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"shaka", 1944);
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assert.throws(RangeError, function () {
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common0231.subtract(months1n, options);
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}, "common-year Chaitra rejects 31 when subtracting");
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[
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[months12n, 2, "M02"],
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[months11n, 3, "M03"],
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[months10n, 4, "M04"],
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[months9n, 5, "M05"],
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[months8n, 6, "M06"]
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].forEach(function ([months, month, monthCode]) {
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TemporalHelpers.assertPlainDate(
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common0231.subtract(months, options),
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1943, month, monthCode, 31, `common-year ${monthCode} does not reject 31 when subtracting`,
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"shaka", 1943);
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});
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[
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[months7n, 7, "M07"],
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[months6n, 8, "M08"],
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[months5n, 9, "M09"],
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[months4n, 10, "M10"],
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[months3n, 11, "M11"],
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[months2n, 12, "M12"],
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].forEach(function ([months, month, monthCode]) {
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TemporalHelpers.assertPlainDate(
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common0231.subtract(months),
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1943, month, monthCode, 30, `common-year ${monthCode} constrains to 30 when subtracting`,
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"shaka", 1943);
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assert.throws(RangeError, function () {
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common0231.subtract(months, options);
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}, `common-year ${monthCode} rejects 31 when adding`);
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});
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// Leap year, backwards
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[
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[months13n, 1, "M01"],
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[months12n, 2, "M02"],
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[months11n, 3, "M03"],
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[months10n, 4, "M04"],
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[months9n, 5, "M05"],
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[months8n, 6, "M06"],
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].forEach(function ([months, month, monthCode]) {
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TemporalHelpers.assertPlainDate(
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common0231After.subtract(months, options),
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1946, month, monthCode, 31, `leap-year ${monthCode} does not reject 31 when subtracting`,
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"shaka", 1946);
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});
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[
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[months7n, 7, "M07"],
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[months6n, 8, "M08"],
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[months5n, 9, "M09"],
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[months4n, 10, "M10"],
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[months3n, 11, "M11"],
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[months2n, 12, "M12"],
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].forEach(function ([months, month, monthCode]) {
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TemporalHelpers.assertPlainDate(
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common0231After.subtract(months),
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1946, month, monthCode, 30, `leap-year ${monthCode} constrains to 30 when subtracting`,
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"shaka", 1946);
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assert.throws(RangeError, function () {
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common0231After.subtract(months, options);
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}, `leap-year ${monthCode} rejects 31 when adding`);
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});

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