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Intl Era Monthcode: Era boundary tests for japanese calendar

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Co-Authored-By: Philip Chimento <pchimento@igalia.com>
This commit is contained in:
Jesse Alama 2025-11-07 20:44:03 -08:00 committed by Ms2ger
parent 2ab10be334
commit c7c9481e8c
6 changed files with 486 additions and 0 deletions
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test/intl402/Temporal/PlainDate/prototype/add/era-boundary-japanese.js vendored Normal file
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// Copyright (C) 2025 Igalia, S.L. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-temporal.plaindate.prototype.add
description: >
Adding years works correctly across era boundaries in calendars with eras
includes: [temporalHelpers.js]
features: [Temporal, Intl.Era-monthcode]
---*/
// Reiwa era started on May 1, 2019 (Reiwa 1 = 2019)
// Heisei era: 1989-2019 (Heisei 31 ended April 30, 2019)
const duration1 = new Temporal.Duration(1);
const duration1n = new Temporal.Duration(-1);
const calendar = "japanese";
const options = { overflow: "reject" };
const date1 = Temporal.PlainDate.from({ era: "heisei", eraYear: 30, monthCode: "M03", day: 15, calendar }, options);
TemporalHelpers.assertPlainDate(
date1.add(duration1),
2019, 3, "M03", 15, "Adding 1 year to Heisei 30 March (before May 1) lands in Heisei 31 March",
"heisei", 31
);
const date2 = Temporal.PlainDate.from({ era: "heisei", eraYear: 31, monthCode: "M04", day: 15, calendar }, options);
TemporalHelpers.assertPlainDate(
date2.add(duration1),
2020, 4, "M04", 15, "Adding 1 year to Heisei 31 April (before May 1) lands in Reiwa 2 April",
"reiwa", 2
);
const date3 = Temporal.PlainDate.from({ era: "heisei", eraYear: 30, monthCode: "M06", day: 12, calendar }, options);
TemporalHelpers.assertPlainDate(
date3.add(duration1),
2019, 6, "M06", 12, "Adding 1 year to Heisei 30 June (after May 1) lands in Reiwa 1 June",
"reiwa", 1
);
const date4 = Temporal.PlainDate.from({ era: "reiwa", eraYear: 1, monthCode: "M06", day: 10, calendar }, options);
TemporalHelpers.assertPlainDate(
date4.add(duration1),
2020, 6, "M06", 10, "Adding 1 year to Reiwa 1 June lands in Reiwa 2 June",
"reiwa", 2
);
const date5 = Temporal.PlainDate.from({ era: "heisei", eraYear: 28, monthCode: "M07", day: 1, calendar }, options);
TemporalHelpers.assertPlainDate(
date5.add(new Temporal.Duration(3)),
2019, 7, "M07", 1, "Multiple years across era boundary: Adding 3 years to Heisei 28 July lands in Reiwa 1 July",
"reiwa", 1
);
const date6 = Temporal.PlainDate.from({ era: "reiwa", eraYear: 2, monthCode: "M06", day: 15, calendar }, options);
TemporalHelpers.assertPlainDate(
date6.add(duration1n),
2019, 6, "M06", 15, "Subtracting 1 year from Reiwa 2 June lands in Reiwa 1 June",
"reiwa", 1
);
const date7 = Temporal.PlainDate.from({ era: "reiwa", eraYear: 2, monthCode: "M03", day: 15, calendar }, options);
TemporalHelpers.assertPlainDate(
date7.add(duration1n),
2019, 3, "M03", 15, "Subtracting 1 year from Reiwa 2 March lands in Heisei 31 March",
"heisei", 31
);
const date8 = Temporal.PlainDate.from({ era: "reiwa", eraYear: 1, monthCode: "M07", day: 10, calendar }, options);
TemporalHelpers.assertPlainDate(
date8.add(duration1n),
2018, 7, "M07", 10, "Subtracting 1 year from Reiwa 1 July lands in Heisei 30 July",
"heisei", 30
);
const date9 = Temporal.PlainDate.from({ era: "reiwa", eraYear: 4, monthCode: "M02", day: 1, calendar }, options);
TemporalHelpers.assertPlainDate(
date9.add(new Temporal.Duration(-5)),
2017, 2, "M02", 1, "Subtracting 5 years from Reiwa 4 February lands in Heisei 29 February",
"heisei", 29
);

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test/intl402/Temporal/PlainDate/prototype/subtract/era-boundary-japanese.js vendored Normal file
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// Copyright (C) 2025 Igalia, S.L. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-temporal.plaindate.prototype.subtract
description: >
Adding years works correctly across era boundaries in calendars with eras
includes: [temporalHelpers.js]
features: [Temporal, Intl.Era-monthcode]
---*/
// Reiwa era started on May 1, 2019 (Reiwa 1 = 2019)
// Heisei era: 1989-2019 (Heisei 31 ended April 30, 2019)
const duration1 = new Temporal.Duration(-1);
const duration1n = new Temporal.Duration(1);
const calendar = "japanese";
const options = { overflow: "reject" };
const date1 = Temporal.PlainDate.from({ era: "heisei", eraYear: 30, monthCode: "M03", day: 15, calendar }, options);
TemporalHelpers.assertPlainDate(
date1.subtract(duration1),
2019, 3, "M03", 15, "Adding 1 year to Heisei 30 March (before May 1) lands in Heisei 31 March",
"heisei", 31
);
const date2 = Temporal.PlainDate.from({ era: "heisei", eraYear: 31, monthCode: "M04", day: 15, calendar }, options);
TemporalHelpers.assertPlainDate(
date2.subtract(duration1),
2020, 4, "M04", 15, "Adding 1 year to Heisei 31 April (before May 1) lands in Reiwa 2 April",
"reiwa", 2
);
const date3 = Temporal.PlainDate.from({ era: "heisei", eraYear: 30, monthCode: "M06", day: 12, calendar }, options);
TemporalHelpers.assertPlainDate(
date3.subtract(duration1),
2019, 6, "M06", 12, "Adding 1 year to Heisei 30 June (after May 1) lands in Reiwa 1 June",
"reiwa", 1
);
const date4 = Temporal.PlainDate.from({ era: "reiwa", eraYear: 1, monthCode: "M06", day: 10, calendar }, options);
TemporalHelpers.assertPlainDate(
date4.subtract(duration1),
2020, 6, "M06", 10, "Adding 1 year to Reiwa 1 June lands in Reiwa 2 June",
"reiwa", 2
);
const date5 = Temporal.PlainDate.from({ era: "heisei", eraYear: 28, monthCode: "M07", day: 1, calendar }, options);
TemporalHelpers.assertPlainDate(
date5.subtract(new Temporal.Duration(-3)),
2019, 7, "M07", 1, "Multiple years across era boundary: Adding 3 years to Heisei 28 July lands in Reiwa 1 July",
"reiwa", 1
);
const date6 = Temporal.PlainDate.from({ era: "reiwa", eraYear: 2, monthCode: "M06", day: 15, calendar }, options);
TemporalHelpers.assertPlainDate(
date6.subtract(duration1n),
2019, 6, "M06", 15, "Subtracting 1 year from Reiwa 2 June lands in Reiwa 1 June",
"reiwa", 1
);
const date7 = Temporal.PlainDate.from({ era: "reiwa", eraYear: 2, monthCode: "M03", day: 15, calendar }, options);
TemporalHelpers.assertPlainDate(
date7.subtract(duration1n),
2019, 3, "M03", 15, "Subtracting 1 year from Reiwa 2 March lands in Heisei 31 March",
"heisei", 31
);
const date8 = Temporal.PlainDate.from({ era: "reiwa", eraYear: 1, monthCode: "M07", day: 10, calendar }, options);
TemporalHelpers.assertPlainDate(
date8.subtract(duration1n),
2018, 7, "M07", 10, "Subtracting 1 year from Reiwa 1 July lands in Heisei 30 July",
"heisei", 30
);
const date9 = Temporal.PlainDate.from({ era: "reiwa", eraYear: 4, monthCode: "M02", day: 1, calendar }, options);
TemporalHelpers.assertPlainDate(
date9.subtract(new Temporal.Duration(5)),
2017, 2, "M02", 1, "Subtracting 5 years from Reiwa 4 February lands in Heisei 29 February",
"heisei", 29
);

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test/intl402/Temporal/PlainDateTime/prototype/add/era-boundary-japanese.js vendored Normal file
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// Copyright (C) 2025 Igalia, S.L. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-temporal.plaindatetime.prototype.add
description: >
Adding years works correctly across era boundaries in calendars with eras
includes: [temporalHelpers.js]
features: [Temporal, Intl.Era-monthcode]
---*/
// Reiwa era started on May 1, 2019 (Reiwa 1 = 2019)
// Heisei era: 1989-2019 (Heisei 31 ended April 30, 2019)
const duration1 = new Temporal.Duration(1);
const duration1n = new Temporal.Duration(-1);
const calendar = "japanese";
const options = { overflow: "reject" };
const date1 = Temporal.PlainDateTime.from({ era: "heisei", eraYear: 30, monthCode: "M03", day: 15, hour: 12, minute: 34, calendar }, options);
TemporalHelpers.assertPlainDateTime(
date1.add(duration1),
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",
"heisei", 31
);
const date2 = Temporal.PlainDateTime.from({ era: "heisei", eraYear: 31, monthCode: "M04", day: 15, hour: 12, minute: 34, calendar }, options);
TemporalHelpers.assertPlainDateTime(
date2.add(duration1),
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",
"reiwa", 2
);
const date3 = Temporal.PlainDateTime.from({ era: "heisei", eraYear: 30, monthCode: "M06", day: 12, hour: 12, minute: 34, calendar }, options);
TemporalHelpers.assertPlainDateTime(
date3.add(duration1),
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",
"reiwa", 1
);
const date4 = Temporal.PlainDateTime.from({ era: "reiwa", eraYear: 1, monthCode: "M06", day: 10, hour: 12, minute: 34, calendar }, options);
TemporalHelpers.assertPlainDateTime(
date4.add(duration1),
2020, 6, "M06", 10, 12, 34, 0, 0, 0, 0, "Adding 1 year to Reiwa 1 June lands in Reiwa 2 June",
"reiwa", 2
);
const date5 = Temporal.PlainDateTime.from({ era: "heisei", eraYear: 28, monthCode: "M07", day: 1, hour: 12, minute: 34, calendar }, options);
TemporalHelpers.assertPlainDateTime(
date5.add(new Temporal.Duration(3)),
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",
"reiwa", 1
);
const date6 = Temporal.PlainDateTime.from({ era: "reiwa", eraYear: 2, monthCode: "M06", day: 15, hour: 12, minute: 34, calendar }, options);
TemporalHelpers.assertPlainDateTime(
date6.add(duration1n),
2019, 6, "M06", 15, 12, 34, 0, 0, 0, 0, "Subtracting 1 year from Reiwa 2 June lands in Reiwa 1 June",
"reiwa", 1
);
const date7 = Temporal.PlainDateTime.from({ era: "reiwa", eraYear: 2, monthCode: "M03", day: 15, hour: 12, minute: 34, calendar }, options);
TemporalHelpers.assertPlainDateTime(
date7.add(duration1n),
2019, 3, "M03", 15, 12, 34, 0, 0, 0, 0, "Subtracting 1 year from Reiwa 2 March lands in Heisei 31 March",
"heisei", 31
);
const date8 = Temporal.PlainDateTime.from({ era: "reiwa", eraYear: 1, monthCode: "M07", day: 10, hour: 12, minute: 34, calendar }, options);
TemporalHelpers.assertPlainDateTime(
date8.add(duration1n),
2018, 7, "M07", 10, 12, 34, 0, 0, 0, 0, "Subtracting 1 year from Reiwa 1 July lands in Heisei 30 July",
"heisei", 30
);
const date9 = Temporal.PlainDateTime.from({ era: "reiwa", eraYear: 4, monthCode: "M02", day: 1, hour: 12, minute: 34, calendar }, options);
TemporalHelpers.assertPlainDateTime(
date9.add(new Temporal.Duration(-5)),
2017, 2, "M02", 1, 12, 34, 0, 0, 0, 0, "Subtracting 5 years from Reiwa 4 February lands in Heisei 29 February",
"heisei", 29
);

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test/intl402/Temporal/PlainDateTime/prototype/subtract/era-boundary-japanese.js vendored Normal file
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// Copyright (C) 2025 Igalia, S.L. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-temporal.plaindatetime.prototype.subtract
description: >
Adding years works correctly across era boundaries in calendars with eras
includes: [temporalHelpers.js]
features: [Temporal, Intl.Era-monthcode]
---*/
// Reiwa era started on May 1, 2019 (Reiwa 1 = 2019)
// Heisei era: 1989-2019 (Heisei 31 ended April 30, 2019)
const duration1 = new Temporal.Duration(-1);
const duration1n = new Temporal.Duration(1);
const calendar = "japanese";
const options = { overflow: "reject" };
const date1 = Temporal.PlainDateTime.from({ era: "heisei", eraYear: 30, monthCode: "M03", day: 15, hour: 12, minute: 34, calendar }, options);
TemporalHelpers.assertPlainDateTime(
date1.subtract(duration1),
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",
"heisei", 31
);
const date2 = Temporal.PlainDateTime.from({ era: "heisei", eraYear: 31, monthCode: "M04", day: 15, hour: 12, minute: 34, calendar }, options);
TemporalHelpers.assertPlainDateTime(
date2.subtract(duration1),
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",
"reiwa", 2
);
const date3 = Temporal.PlainDateTime.from({ era: "heisei", eraYear: 30, monthCode: "M06", day: 12, hour: 12, minute: 34, calendar }, options);
TemporalHelpers.assertPlainDateTime(
date3.subtract(duration1),
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",
"reiwa", 1
);
const date4 = Temporal.PlainDateTime.from({ era: "reiwa", eraYear: 1, monthCode: "M06", day: 10, hour: 12, minute: 34, calendar }, options);
TemporalHelpers.assertPlainDateTime(
date4.subtract(duration1),
2020, 6, "M06", 10, 12, 34, 0, 0, 0, 0, "Adding 1 year to Reiwa 1 June lands in Reiwa 2 June",
"reiwa", 2
);
const date5 = Temporal.PlainDateTime.from({ era: "heisei", eraYear: 28, monthCode: "M07", day: 1, hour: 12, minute: 34, calendar }, options);
TemporalHelpers.assertPlainDateTime(
date5.subtract(new Temporal.Duration(-3)),
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",
"reiwa", 1
);
const date6 = Temporal.PlainDateTime.from({ era: "reiwa", eraYear: 2, monthCode: "M06", day: 15, hour: 12, minute: 34, calendar }, options);
TemporalHelpers.assertPlainDateTime(
date6.subtract(duration1n),
2019, 6, "M06", 15, 12, 34, 0, 0, 0, 0, "Subtracting 1 year from Reiwa 2 June lands in Reiwa 1 June",
"reiwa", 1
);
const date7 = Temporal.PlainDateTime.from({ era: "reiwa", eraYear: 2, monthCode: "M03", day: 15, hour: 12, minute: 34, calendar }, options);
TemporalHelpers.assertPlainDateTime(
date7.subtract(duration1n),
2019, 3, "M03", 15, 12, 34, 0, 0, 0, 0, "Subtracting 1 year from Reiwa 2 March lands in Heisei 31 March",
"heisei", 31
);
const date8 = Temporal.PlainDateTime.from({ era: "reiwa", eraYear: 1, monthCode: "M07", day: 10, hour: 12, minute: 34, calendar }, options);
TemporalHelpers.assertPlainDateTime(
date8.subtract(duration1n),
2018, 7, "M07", 10, 12, 34, 0, 0, 0, 0, "Subtracting 1 year from Reiwa 1 July lands in Heisei 30 July",
"heisei", 30
);
const date9 = Temporal.PlainDateTime.from({ era: "reiwa", eraYear: 4, monthCode: "M02", day: 1, hour: 12, minute: 34, calendar }, options);
TemporalHelpers.assertPlainDateTime(
date9.subtract(new Temporal.Duration(5)),
2017, 2, "M02", 1, 12, 34, 0, 0, 0, 0, "Subtracting 5 years from Reiwa 4 February lands in Heisei 29 February",
"heisei", 29
);

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test/intl402/Temporal/ZonedDateTime/prototype/add/era-boundary-japanese.js vendored Normal file
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// Copyright (C) 2025 Igalia, S.L. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-temporal.zoneddatetime.prototype.add
description: >
Adding years works correctly across era boundaries in calendars with eras
includes: [temporalHelpers.js]
features: [Temporal, Intl.Era-monthcode]
---*/
// Reiwa era started on May 1, 2019 (Reiwa 1 = 2019)
// Heisei era: 1989-2019 (Heisei 31 ended April 30, 2019)
const duration1 = new Temporal.Duration(1);
const duration1n = new Temporal.Duration(-1);
const calendar = "japanese";
const options = { overflow: "reject" };
const date1 = Temporal.ZonedDateTime.from({ era: "heisei", eraYear: 30, monthCode: "M03", day: 15, hour: 12, minute: 34, timeZone: "UTC", calendar }, options);
TemporalHelpers.assertPlainDateTime(
date1.add(duration1).toPlainDateTime(),
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",
"heisei", 31
);
const date2 = Temporal.ZonedDateTime.from({ era: "heisei", eraYear: 31, monthCode: "M04", day: 15, hour: 12, minute: 34, timeZone: "UTC", calendar }, options);
TemporalHelpers.assertPlainDateTime(
date2.add(duration1).toPlainDateTime(),
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",
"reiwa", 2
);
const date3 = Temporal.ZonedDateTime.from({ era: "heisei", eraYear: 30, monthCode: "M06", day: 12, hour: 12, minute: 34, timeZone: "UTC", calendar }, options);
TemporalHelpers.assertPlainDateTime(
date3.add(duration1).toPlainDateTime(),
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",
"reiwa", 1
);
const date4 = Temporal.ZonedDateTime.from({ era: "reiwa", eraYear: 1, monthCode: "M06", day: 10, hour: 12, minute: 34, timeZone: "UTC", calendar }, options);
TemporalHelpers.assertPlainDateTime(
date4.add(duration1).toPlainDateTime(),
2020, 6, "M06", 10, 12, 34, 0, 0, 0, 0, "Adding 1 year to Reiwa 1 June lands in Reiwa 2 June",
"reiwa", 2
);
const date5 = Temporal.ZonedDateTime.from({ era: "heisei", eraYear: 28, monthCode: "M07", day: 1, hour: 12, minute: 34, timeZone: "UTC", calendar }, options);
TemporalHelpers.assertPlainDateTime(
date5.add(new Temporal.Duration(3)).toPlainDateTime(),
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",
"reiwa", 1
);
const date6 = Temporal.ZonedDateTime.from({ era: "reiwa", eraYear: 2, monthCode: "M06", day: 15, hour: 12, minute: 34, timeZone: "UTC", calendar }, options);
TemporalHelpers.assertPlainDateTime(
date6.add(duration1n).toPlainDateTime(),
2019, 6, "M06", 15, 12, 34, 0, 0, 0, 0, "Subtracting 1 year from Reiwa 2 June lands in Reiwa 1 June",
"reiwa", 1
);
const date7 = Temporal.ZonedDateTime.from({ era: "reiwa", eraYear: 2, monthCode: "M03", day: 15, hour: 12, minute: 34, timeZone: "UTC", calendar }, options);
TemporalHelpers.assertPlainDateTime(
date7.add(duration1n).toPlainDateTime(),
2019, 3, "M03", 15, 12, 34, 0, 0, 0, 0, "Subtracting 1 year from Reiwa 2 March lands in Heisei 31 March",
"heisei", 31
);
const date8 = Temporal.ZonedDateTime.from({ era: "reiwa", eraYear: 1, monthCode: "M07", day: 10, hour: 12, minute: 34, timeZone: "UTC", calendar }, options);
TemporalHelpers.assertPlainDateTime(
date8.add(duration1n).toPlainDateTime(),
2018, 7, "M07", 10, 12, 34, 0, 0, 0, 0, "Subtracting 1 year from Reiwa 1 July lands in Heisei 30 July",
"heisei", 30
);
const date9 = Temporal.ZonedDateTime.from({ era: "reiwa", eraYear: 4, monthCode: "M02", day: 1, hour: 12, minute: 34, timeZone: "UTC", calendar }, options);
TemporalHelpers.assertPlainDateTime(
date9.add(new Temporal.Duration(-5)).toPlainDateTime(),
2017, 2, "M02", 1, 12, 34, 0, 0, 0, 0, "Subtracting 5 years from Reiwa 4 February lands in Heisei 29 February",
"heisei", 29
);

81
test/intl402/Temporal/ZonedDateTime/prototype/subtract/era-boundary-japanese.js vendored Normal file
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// Copyright (C) 2025 Igalia, S.L. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-temporal.zoneddatetime.prototype.subtract
description: >
Adding years works correctly across era boundaries in calendars with eras
includes: [temporalHelpers.js]
features: [Temporal, Intl.Era-monthcode]
---*/
// Reiwa era started on May 1, 2019 (Reiwa 1 = 2019)
// Heisei era: 1989-2019 (Heisei 31 ended April 30, 2019)
const duration1 = new Temporal.Duration(-1);
const duration1n = new Temporal.Duration(1);
const calendar = "japanese";
const options = { overflow: "reject" };
const date1 = Temporal.ZonedDateTime.from({ era: "heisei", eraYear: 30, monthCode: "M03", day: 15, hour: 12, minute: 34, timeZone: "UTC", calendar }, options);
TemporalHelpers.assertPlainDateTime(
date1.subtract(duration1).toPlainDateTime(),
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",
"heisei", 31
);
const date2 = Temporal.ZonedDateTime.from({ era: "heisei", eraYear: 31, monthCode: "M04", day: 15, hour: 12, minute: 34, timeZone: "UTC", calendar }, options);
TemporalHelpers.assertPlainDateTime(
date2.subtract(duration1).toPlainDateTime(),
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",
"reiwa", 2
);
const date3 = Temporal.ZonedDateTime.from({ era: "heisei", eraYear: 30, monthCode: "M06", day: 12, hour: 12, minute: 34, timeZone: "UTC", calendar }, options);
TemporalHelpers.assertPlainDateTime(
date3.subtract(duration1).toPlainDateTime(),
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",
"reiwa", 1
);
const date4 = Temporal.ZonedDateTime.from({ era: "reiwa", eraYear: 1, monthCode: "M06", day: 10, hour: 12, minute: 34, timeZone: "UTC", calendar }, options);
TemporalHelpers.assertPlainDateTime(
date4.subtract(duration1).toPlainDateTime(),
2020, 6, "M06", 10, 12, 34, 0, 0, 0, 0, "Adding 1 year to Reiwa 1 June lands in Reiwa 2 June",
"reiwa", 2
);
const date5 = Temporal.ZonedDateTime.from({ era: "heisei", eraYear: 28, monthCode: "M07", day: 1, hour: 12, minute: 34, timeZone: "UTC", calendar }, options);
TemporalHelpers.assertPlainDateTime(
date5.subtract(new Temporal.Duration(-3)).toPlainDateTime(),
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",
"reiwa", 1
);
const date6 = Temporal.ZonedDateTime.from({ era: "reiwa", eraYear: 2, monthCode: "M06", day: 15, hour: 12, minute: 34, timeZone: "UTC", calendar }, options);
TemporalHelpers.assertPlainDateTime(
date6.subtract(duration1n).toPlainDateTime(),
2019, 6, "M06", 15, 12, 34, 0, 0, 0, 0, "Subtracting 1 year from Reiwa 2 June lands in Reiwa 1 June",
"reiwa", 1
);
const date7 = Temporal.ZonedDateTime.from({ era: "reiwa", eraYear: 2, monthCode: "M03", day: 15, hour: 12, minute: 34, timeZone: "UTC", calendar }, options);
TemporalHelpers.assertPlainDateTime(
date7.subtract(duration1n).toPlainDateTime(),
2019, 3, "M03", 15, 12, 34, 0, 0, 0, 0, "Subtracting 1 year from Reiwa 2 March lands in Heisei 31 March",
"heisei", 31
);
const date8 = Temporal.ZonedDateTime.from({ era: "reiwa", eraYear: 1, monthCode: "M07", day: 10, hour: 12, minute: 34, timeZone: "UTC", calendar }, options);
TemporalHelpers.assertPlainDateTime(
date8.subtract(duration1n).toPlainDateTime(),
2018, 7, "M07", 10, 12, 34, 0, 0, 0, 0, "Subtracting 1 year from Reiwa 1 July lands in Heisei 30 July",
"heisei", 30
);
const date9 = Temporal.ZonedDateTime.from({ era: "reiwa", eraYear: 4, monthCode: "M02", day: 1, hour: 12, minute: 34, timeZone: "UTC", calendar }, options);
TemporalHelpers.assertPlainDateTime(
date9.subtract(new Temporal.Duration(5)).toPlainDateTime(),
2017, 2, "M02", 1, 12, 34, 0, 0, 0, 0, "Subtracting 5 years from Reiwa 4 February lands in Heisei 29 February",
"heisei", 29
);