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Intl Era Monthcode: Era boundary tests for japanese calendar
Co-Authored-By: Philip Chimento <[email protected]>
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‎test/intl402/Temporal/PlainDate/prototype/add/era-boundary-japanese.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: >
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Adding years works correctly across era boundaries in calendars with eras
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includes: [temporalHelpers.js]
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features: [Temporal, Intl.Era-monthcode]
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---*/
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// Reiwa era started on May 1, 2019 (Reiwa 1 = 2019)
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// Heisei era: 1989-2019 (Heisei 31 ended April 30, 2019)
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const duration1 = new Temporal.Duration(1);
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const duration1n = new Temporal.Duration(-1);
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const calendar = "japanese";
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const options = { overflow: "reject" };
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const date1 = Temporal.PlainDate.from({ era: "heisei", eraYear: 30, monthCode: "M03", day: 15, calendar }, options);
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TemporalHelpers.assertPlainDate(
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date1.add(duration1),
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2019, 3, "M03", 15, "Adding 1 year to Heisei 30 March (before May 1) lands in Heisei 31 March",
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"heisei", 31
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);
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const date2 = Temporal.PlainDate.from({ era: "heisei", eraYear: 31, monthCode: "M04", day: 15, calendar }, options);
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TemporalHelpers.assertPlainDate(
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date2.add(duration1),
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2020, 4, "M04", 15, "Adding 1 year to Heisei 31 April (before May 1) lands in Reiwa 2 April",
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"reiwa", 2
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);
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const date3 = Temporal.PlainDate.from({ era: "heisei", eraYear: 30, monthCode: "M06", day: 12, calendar }, options);
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TemporalHelpers.assertPlainDate(
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date3.add(duration1),
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2019, 6, "M06", 12, "Adding 1 year to Heisei 30 June (after May 1) lands in Reiwa 1 June",
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"reiwa", 1
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);
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const date4 = Temporal.PlainDate.from({ era: "reiwa", eraYear: 1, monthCode: "M06", day: 10, calendar }, options);
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TemporalHelpers.assertPlainDate(
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date4.add(duration1),
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2020, 6, "M06", 10, "Adding 1 year to Reiwa 1 June lands in Reiwa 2 June",
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"reiwa", 2
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);
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const date5 = Temporal.PlainDate.from({ era: "heisei", eraYear: 28, monthCode: "M07", day: 1, calendar }, options);
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TemporalHelpers.assertPlainDate(
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date5.add(new Temporal.Duration(3)),
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2019, 7, "M07", 1, "Multiple years across era boundary: Adding 3 years to Heisei 28 July lands in Reiwa 1 July",
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"reiwa", 1
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);
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const date6 = Temporal.PlainDate.from({ era: "reiwa", eraYear: 2, monthCode: "M06", day: 15, calendar }, options);
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TemporalHelpers.assertPlainDate(
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date6.add(duration1n),
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2019, 6, "M06", 15, "Subtracting 1 year from Reiwa 2 June lands in Reiwa 1 June",
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"reiwa", 1
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);
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const date7 = Temporal.PlainDate.from({ era: "reiwa", eraYear: 2, monthCode: "M03", day: 15, calendar }, options);
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TemporalHelpers.assertPlainDate(
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date7.add(duration1n),
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2019, 3, "M03", 15, "Subtracting 1 year from Reiwa 2 March lands in Heisei 31 March",
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"heisei", 31
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);
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const date8 = Temporal.PlainDate.from({ era: "reiwa", eraYear: 1, monthCode: "M07", day: 10, calendar }, options);
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TemporalHelpers.assertPlainDate(
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date8.add(duration1n),
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2018, 7, "M07", 10, "Subtracting 1 year from Reiwa 1 July lands in Heisei 30 July",
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"heisei", 30
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);
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const date9 = Temporal.PlainDate.from({ era: "reiwa", eraYear: 4, monthCode: "M02", day: 1, calendar }, options);
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TemporalHelpers.assertPlainDate(
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date9.add(new Temporal.Duration(-5)),
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2017, 2, "M02", 1, "Subtracting 5 years from Reiwa 4 February lands in Heisei 29 February",
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"heisei", 29
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);

‎test/intl402/Temporal/PlainDate/prototype/subtract/era-boundary-japanese.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: >
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Adding years works correctly across era boundaries in calendars with eras
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includes: [temporalHelpers.js]
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features: [Temporal, Intl.Era-monthcode]
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---*/
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// Reiwa era started on May 1, 2019 (Reiwa 1 = 2019)
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// Heisei era: 1989-2019 (Heisei 31 ended April 30, 2019)
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const duration1 = new Temporal.Duration(-1);
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const duration1n = new Temporal.Duration(1);
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const calendar = "japanese";
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const options = { overflow: "reject" };
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const date1 = Temporal.PlainDate.from({ era: "heisei", eraYear: 30, monthCode: "M03", day: 15, calendar }, options);
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TemporalHelpers.assertPlainDate(
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date1.subtract(duration1),
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2019, 3, "M03", 15, "Adding 1 year to Heisei 30 March (before May 1) lands in Heisei 31 March",
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"heisei", 31
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);
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const date2 = Temporal.PlainDate.from({ era: "heisei", eraYear: 31, monthCode: "M04", day: 15, calendar }, options);
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TemporalHelpers.assertPlainDate(
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date2.subtract(duration1),
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2020, 4, "M04", 15, "Adding 1 year to Heisei 31 April (before May 1) lands in Reiwa 2 April",
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"reiwa", 2
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);
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const date3 = Temporal.PlainDate.from({ era: "heisei", eraYear: 30, monthCode: "M06", day: 12, calendar }, options);
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TemporalHelpers.assertPlainDate(
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date3.subtract(duration1),
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2019, 6, "M06", 12, "Adding 1 year to Heisei 30 June (after May 1) lands in Reiwa 1 June",
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"reiwa", 1
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);
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const date4 = Temporal.PlainDate.from({ era: "reiwa", eraYear: 1, monthCode: "M06", day: 10, calendar }, options);
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TemporalHelpers.assertPlainDate(
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date4.subtract(duration1),
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2020, 6, "M06", 10, "Adding 1 year to Reiwa 1 June lands in Reiwa 2 June",
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"reiwa", 2
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);
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const date5 = Temporal.PlainDate.from({ era: "heisei", eraYear: 28, monthCode: "M07", day: 1, calendar }, options);
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TemporalHelpers.assertPlainDate(
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date5.subtract(new Temporal.Duration(-3)),
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2019, 7, "M07", 1, "Multiple years across era boundary: Adding 3 years to Heisei 28 July lands in Reiwa 1 July",
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"reiwa", 1
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);
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const date6 = Temporal.PlainDate.from({ era: "reiwa", eraYear: 2, monthCode: "M06", day: 15, calendar }, options);
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TemporalHelpers.assertPlainDate(
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date6.subtract(duration1n),
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2019, 6, "M06", 15, "Subtracting 1 year from Reiwa 2 June lands in Reiwa 1 June",
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"reiwa", 1
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);
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const date7 = Temporal.PlainDate.from({ era: "reiwa", eraYear: 2, monthCode: "M03", day: 15, calendar }, options);
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TemporalHelpers.assertPlainDate(
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date7.subtract(duration1n),
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2019, 3, "M03", 15, "Subtracting 1 year from Reiwa 2 March lands in Heisei 31 March",
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"heisei", 31
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);
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const date8 = Temporal.PlainDate.from({ era: "reiwa", eraYear: 1, monthCode: "M07", day: 10, calendar }, options);
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TemporalHelpers.assertPlainDate(
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date8.subtract(duration1n),
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2018, 7, "M07", 10, "Subtracting 1 year from Reiwa 1 July lands in Heisei 30 July",
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"heisei", 30
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);
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const date9 = Temporal.PlainDate.from({ era: "reiwa", eraYear: 4, monthCode: "M02", day: 1, calendar }, options);
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TemporalHelpers.assertPlainDate(
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date9.subtract(new Temporal.Duration(5)),
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2017, 2, "M02", 1, "Subtracting 5 years from Reiwa 4 February lands in Heisei 29 February",
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"heisei", 29
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);

‎test/intl402/Temporal/PlainDateTime/prototype/add/era-boundary-japanese.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.plaindatetime.prototype.add
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description: >
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Adding years works correctly across era boundaries in calendars with eras
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includes: [temporalHelpers.js]
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features: [Temporal, Intl.Era-monthcode]
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---*/
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// Reiwa era started on May 1, 2019 (Reiwa 1 = 2019)
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// Heisei era: 1989-2019 (Heisei 31 ended April 30, 2019)
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const duration1 = new Temporal.Duration(1);
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const duration1n = new Temporal.Duration(-1);
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const calendar = "japanese";
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const options = { overflow: "reject" };
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const date1 = Temporal.PlainDateTime.from({ era: "heisei", eraYear: 30, monthCode: "M03", day: 15, hour: 12, minute: 34, calendar }, options);
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TemporalHelpers.assertPlainDateTime(
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date1.add(duration1),
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2019, 3, "M03", 15, 12, 34, 0, 0, 0, 0, "Adding 1 year to Heisei 30 March (before May 1) lands in Heisei 31 March",
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"heisei", 31
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);
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const date2 = Temporal.PlainDateTime.from({ era: "heisei", eraYear: 31, monthCode: "M04", day: 15, hour: 12, minute: 34, calendar }, options);
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TemporalHelpers.assertPlainDateTime(
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date2.add(duration1),
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2020, 4, "M04", 15, 12, 34, 0, 0, 0, 0, "Adding 1 year to Heisei 31 April (before May 1) lands in Reiwa 2 April",
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"reiwa", 2
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);
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const date3 = Temporal.PlainDateTime.from({ era: "heisei", eraYear: 30, monthCode: "M06", day: 12, hour: 12, minute: 34, calendar }, options);
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TemporalHelpers.assertPlainDateTime(
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date3.add(duration1),
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2019, 6, "M06", 12, 12, 34, 0, 0, 0, 0, "Adding 1 year to Heisei 30 June (after May 1) lands in Reiwa 1 June",
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"reiwa", 1
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);
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const date4 = Temporal.PlainDateTime.from({ era: "reiwa", eraYear: 1, monthCode: "M06", day: 10, hour: 12, minute: 34, calendar }, options);
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TemporalHelpers.assertPlainDateTime(
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date4.add(duration1),
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2020, 6, "M06", 10, 12, 34, 0, 0, 0, 0, "Adding 1 year to Reiwa 1 June lands in Reiwa 2 June",
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"reiwa", 2
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);
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const date5 = Temporal.PlainDateTime.from({ era: "heisei", eraYear: 28, monthCode: "M07", day: 1, hour: 12, minute: 34, calendar }, options);
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TemporalHelpers.assertPlainDateTime(
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date5.add(new Temporal.Duration(3)),
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2019, 7, "M07", 1, 12, 34, 0, 0, 0, 0, "Multiple years across era boundary: Adding 3 years to Heisei 28 July lands in Reiwa 1 July",
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"reiwa", 1
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);
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const date6 = Temporal.PlainDateTime.from({ era: "reiwa", eraYear: 2, monthCode: "M06", day: 15, hour: 12, minute: 34, calendar }, options);
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TemporalHelpers.assertPlainDateTime(
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date6.add(duration1n),
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2019, 6, "M06", 15, 12, 34, 0, 0, 0, 0, "Subtracting 1 year from Reiwa 2 June lands in Reiwa 1 June",
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"reiwa", 1
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);
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const date7 = Temporal.PlainDateTime.from({ era: "reiwa", eraYear: 2, monthCode: "M03", day: 15, hour: 12, minute: 34, calendar }, options);
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TemporalHelpers.assertPlainDateTime(
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date7.add(duration1n),
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2019, 3, "M03", 15, 12, 34, 0, 0, 0, 0, "Subtracting 1 year from Reiwa 2 March lands in Heisei 31 March",
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"heisei", 31
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);
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const date8 = Temporal.PlainDateTime.from({ era: "reiwa", eraYear: 1, monthCode: "M07", day: 10, hour: 12, minute: 34, calendar }, options);
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TemporalHelpers.assertPlainDateTime(
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date8.add(duration1n),
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2018, 7, "M07", 10, 12, 34, 0, 0, 0, 0, "Subtracting 1 year from Reiwa 1 July lands in Heisei 30 July",
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"heisei", 30
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);
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const date9 = Temporal.PlainDateTime.from({ era: "reiwa", eraYear: 4, monthCode: "M02", day: 1, hour: 12, minute: 34, calendar }, options);
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TemporalHelpers.assertPlainDateTime(
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date9.add(new Temporal.Duration(-5)),
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2017, 2, "M02", 1, 12, 34, 0, 0, 0, 0, "Subtracting 5 years from Reiwa 4 February lands in Heisei 29 February",
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"heisei", 29
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);

‎test/intl402/Temporal/PlainDateTime/prototype/subtract/era-boundary-japanese.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.plaindatetime.prototype.subtract
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description: >
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Adding years works correctly across era boundaries in calendars with eras
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includes: [temporalHelpers.js]
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features: [Temporal, Intl.Era-monthcode]
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---*/
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// Reiwa era started on May 1, 2019 (Reiwa 1 = 2019)
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// Heisei era: 1989-2019 (Heisei 31 ended April 30, 2019)
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const duration1 = new Temporal.Duration(-1);
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const duration1n = new Temporal.Duration(1);
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const calendar = "japanese";
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const options = { overflow: "reject" };
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const date1 = Temporal.PlainDateTime.from({ era: "heisei", eraYear: 30, monthCode: "M03", day: 15, hour: 12, minute: 34, calendar }, options);
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TemporalHelpers.assertPlainDateTime(
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date1.subtract(duration1),
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2019, 3, "M03", 15, 12, 34, 0, 0, 0, 0, "Adding 1 year to Heisei 30 March (before May 1) lands in Heisei 31 March",
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"heisei", 31
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);
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const date2 = Temporal.PlainDateTime.from({ era: "heisei", eraYear: 31, monthCode: "M04", day: 15, hour: 12, minute: 34, calendar }, options);
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TemporalHelpers.assertPlainDateTime(
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date2.subtract(duration1),
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2020, 4, "M04", 15, 12, 34, 0, 0, 0, 0, "Adding 1 year to Heisei 31 April (before May 1) lands in Reiwa 2 April",
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"reiwa", 2
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);
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const date3 = Temporal.PlainDateTime.from({ era: "heisei", eraYear: 30, monthCode: "M06", day: 12, hour: 12, minute: 34, calendar }, options);
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TemporalHelpers.assertPlainDateTime(
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date3.subtract(duration1),
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2019, 6, "M06", 12, 12, 34, 0, 0, 0, 0, "Adding 1 year to Heisei 30 June (after May 1) lands in Reiwa 1 June",
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"reiwa", 1
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);
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const date4 = Temporal.PlainDateTime.from({ era: "reiwa", eraYear: 1, monthCode: "M06", day: 10, hour: 12, minute: 34, calendar }, options);
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TemporalHelpers.assertPlainDateTime(
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date4.subtract(duration1),
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2020, 6, "M06", 10, 12, 34, 0, 0, 0, 0, "Adding 1 year to Reiwa 1 June lands in Reiwa 2 June",
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"reiwa", 2
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);
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const date5 = Temporal.PlainDateTime.from({ era: "heisei", eraYear: 28, monthCode: "M07", day: 1, hour: 12, minute: 34, calendar }, options);
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TemporalHelpers.assertPlainDateTime(
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date5.subtract(new Temporal.Duration(-3)),
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2019, 7, "M07", 1, 12, 34, 0, 0, 0, 0, "Multiple years across era boundary: Adding 3 years to Heisei 28 July lands in Reiwa 1 July",
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"reiwa", 1
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);
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const date6 = Temporal.PlainDateTime.from({ era: "reiwa", eraYear: 2, monthCode: "M06", day: 15, hour: 12, minute: 34, calendar }, options);
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TemporalHelpers.assertPlainDateTime(
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date6.subtract(duration1n),
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2019, 6, "M06", 15, 12, 34, 0, 0, 0, 0, "Subtracting 1 year from Reiwa 2 June lands in Reiwa 1 June",
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"reiwa", 1
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);
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const date7 = Temporal.PlainDateTime.from({ era: "reiwa", eraYear: 2, monthCode: "M03", day: 15, hour: 12, minute: 34, calendar }, options);
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TemporalHelpers.assertPlainDateTime(
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date7.subtract(duration1n),
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2019, 3, "M03", 15, 12, 34, 0, 0, 0, 0, "Subtracting 1 year from Reiwa 2 March lands in Heisei 31 March",
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"heisei", 31
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);
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const date8 = Temporal.PlainDateTime.from({ era: "reiwa", eraYear: 1, monthCode: "M07", day: 10, hour: 12, minute: 34, calendar }, options);
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TemporalHelpers.assertPlainDateTime(
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date8.subtract(duration1n),
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2018, 7, "M07", 10, 12, 34, 0, 0, 0, 0, "Subtracting 1 year from Reiwa 1 July lands in Heisei 30 July",
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"heisei", 30
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);
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const date9 = Temporal.PlainDateTime.from({ era: "reiwa", eraYear: 4, monthCode: "M02", day: 1, hour: 12, minute: 34, calendar }, options);
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TemporalHelpers.assertPlainDateTime(
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date9.subtract(new Temporal.Duration(5)),
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2017, 2, "M02", 1, 12, 34, 0, 0, 0, 0, "Subtracting 5 years from Reiwa 4 February lands in Heisei 29 February",
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"heisei", 29
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);

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