Intl Era Monthcode: Years addition for ethiopic calendar

Co-Authored-By: Philip Chimento <[email protected]>

Author: jessealama

test/intl402/Temporal/PlainDate/prototype/add/add-years-ethiopic.js

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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]
+---*/
+
+const duration5 = new Temporal.Duration(5);
+const calendar = "ethiopic";
+const options = { overflow: "reject" };
+
+const date1 = Temporal.PlainDate.from({ era: "aa", eraYear: 5500, monthCode: "M01", day: 1, calendar });
+TemporalHelpers.assertPlainDate(
+  date1.add(new Temporal.Duration(1)),
+  1, 1, "M01", 1, "Adding 1 year to last year of Amete Alem era lands in year 1 of incarnation era",
+  "am", 1
+);
+
+const date2 = Temporal.PlainDate.from({ era: "am", eraYear: 2000, monthCode: "M06", day: 15, calendar });
+TemporalHelpers.assertPlainDate(
+  date2.add(duration5),
+  2005, 6, "M06", 15, "Adding 5 years within incarnation era",
+  "am", 2005
+);
+
+const date3 = Temporal.PlainDate.from({ era: "aa", eraYear: 5450, monthCode: "M07", day: 12, calendar });
+TemporalHelpers.assertPlainDate(
+  date3.add(duration5),
+  -45, 7, "M07", 12, "Adding 5 years within Amete Alem era",
+  "aa", 5455
+);

test/intl402/Temporal/PlainDate/prototype/subtract/add-years-ethiopic.js

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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]
+---*/
+
+const duration5 = new Temporal.Duration(-5);
+const calendar = "ethiopic";
+const options = { overflow: "reject" };
+
+const date1 = Temporal.PlainDate.from({ era: "aa", eraYear: 5500, monthCode: "M01", day: 1, calendar });
+TemporalHelpers.assertPlainDate(
+  date1.subtract(new Temporal.Duration(-1)),
+  1, 1, "M01", 1, "Adding 1 year to last year of Amete Alem era lands in year 1 of incarnation era",
+  "am", 1
+);
+
+const date2 = Temporal.PlainDate.from({ era: "am", eraYear: 2000, monthCode: "M06", day: 15, calendar });
+TemporalHelpers.assertPlainDate(
+  date2.subtract(duration5),
+  2005, 6, "M06", 15, "Adding 5 years within incarnation era",
+  "am", 2005
+);
+
+const date3 = Temporal.PlainDate.from({ era: "aa", eraYear: 5450, monthCode: "M07", day: 12, calendar });
+TemporalHelpers.assertPlainDate(
+  date3.subtract(duration5),
+  -45, 7, "M07", 12, "Adding 5 years within Amete Alem era",
+  "aa", 5455
+);

test/intl402/Temporal/PlainDateTime/prototype/add/add-years-ethiopic.js

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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]
+---*/
+
+const duration5 = new Temporal.Duration(5);
+const calendar = "ethiopic";
+const options = { overflow: "reject" };
+
+const date1 = Temporal.PlainDateTime.from({ era: "aa", eraYear: 5500, monthCode: "M01", day: 1, hour: 12, minute: 34, calendar });
+TemporalHelpers.assertPlainDateTime(
+  date1.add(new Temporal.Duration(1)),
+  1, 1, "M01", 1, 12, 34, 0, 0, 0, 0, "Adding 1 year to last year of Amete Alem era lands in year 1 of incarnation era",
+  "am", 1
+);
+
+const date2 = Temporal.PlainDateTime.from({ era: "am", eraYear: 2000, monthCode: "M06", day: 15, hour: 12, minute: 34, calendar });
+TemporalHelpers.assertPlainDateTime(
+  date2.add(duration5),
+  2005, 6, "M06", 15, 12, 34, 0, 0, 0, 0, "Adding 5 years within incarnation era",
+  "am", 2005
+);
+
+const date3 = Temporal.PlainDateTime.from({ era: "aa", eraYear: 5450, monthCode: "M07", day: 12, hour: 12, minute: 34, calendar });
+TemporalHelpers.assertPlainDateTime(
+  date3.add(duration5),
+  -45, 7, "M07", 12, 12, 34, 0, 0, 0, 0, "Adding 5 years within Amete Alem era",
+  "aa", 5455
+);

test/intl402/Temporal/PlainDateTime/prototype/subtract/add-years-ethiopic.js

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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]
+---*/
+
+const duration5 = new Temporal.Duration(-5);
+const calendar = "ethiopic";
+const options = { overflow: "reject" };
+
+const date1 = Temporal.PlainDateTime.from({ era: "aa", eraYear: 5500, monthCode: "M01", day: 1, hour: 12, minute: 34, calendar });
+TemporalHelpers.assertPlainDateTime(
+  date1.subtract(new Temporal.Duration(-1)),
+  1, 1, "M01", 1, 12, 34, 0, 0, 0, 0, "Adding 1 year to last year of Amete Alem era lands in year 1 of incarnation era",
+  "am", 1
+);
+
+const date2 = Temporal.PlainDateTime.from({ era: "am", eraYear: 2000, monthCode: "M06", day: 15, hour: 12, minute: 34, calendar });
+TemporalHelpers.assertPlainDateTime(
+  date2.subtract(duration5),
+  2005, 6, "M06", 15, 12, 34, 0, 0, 0, 0, "Adding 5 years within incarnation era",
+  "am", 2005
+);
+
+const date3 = Temporal.PlainDateTime.from({ era: "aa", eraYear: 5450, monthCode: "M07", day: 12, hour: 12, minute: 34, calendar });
+TemporalHelpers.assertPlainDateTime(
+  date3.subtract(duration5),
+  -45, 7, "M07", 12, 12, 34, 0, 0, 0, 0, "Adding 5 years within Amete Alem era",
+  "aa", 5455
+);

test/intl402/Temporal/ZonedDateTime/prototype/add/add-years-ethiopic.js

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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]
+---*/
+
+const duration5 = new Temporal.Duration(5);
+const calendar = "ethiopic";
+const options = { overflow: "reject" };
+
+const date1 = Temporal.ZonedDateTime.from({ era: "aa", eraYear: 5500, monthCode: "M01", day: 1, hour: 12, minute: 34, timeZone: "UTC", calendar });
+TemporalHelpers.assertPlainDateTime(
+  date1.add(new Temporal.Duration(1)).toPlainDateTime(),
+  1, 1, "M01", 1, 12, 34, 0, 0, 0, 0, "Adding 1 year to last year of Amete Alem era lands in year 1 of incarnation era",
+  "am", 1
+);
+
+const date2 = Temporal.ZonedDateTime.from({ era: "am", eraYear: 2000, monthCode: "M06", day: 15, hour: 12, minute: 34, timeZone: "UTC", calendar });
+TemporalHelpers.assertPlainDateTime(
+  date2.add(duration5).toPlainDateTime(),
+  2005, 6, "M06", 15, 12, 34, 0, 0, 0, 0, "Adding 5 years within incarnation era",
+  "am", 2005
+);
+
+const date3 = Temporal.ZonedDateTime.from({ era: "aa", eraYear: 5450, monthCode: "M07", day: 12, hour: 12, minute: 34, timeZone: "UTC", calendar });
+TemporalHelpers.assertPlainDateTime(
+  date3.add(duration5).toPlainDateTime(),
+  -45, 7, "M07", 12, 12, 34, 0, 0, 0, 0, "Adding 5 years within Amete Alem era",
+  "aa", 5455
+);

test/intl402/Temporal/ZonedDateTime/prototype/subtract/add-years-ethiopic.js

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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]
+---*/
+
+const duration5 = new Temporal.Duration(-5);
+const calendar = "ethiopic";
+const options = { overflow: "reject" };
+
+const date1 = Temporal.ZonedDateTime.from({ era: "aa", eraYear: 5500, monthCode: "M01", day: 1, hour: 12, minute: 34, timeZone: "UTC", calendar });
+TemporalHelpers.assertPlainDateTime(
+  date1.subtract(new Temporal.Duration(-1)).toPlainDateTime(),
+  1, 1, "M01", 1, 12, 34, 0, 0, 0, 0, "Adding 1 year to last year of Amete Alem era lands in year 1 of incarnation era",
+  "am", 1
+);
+
+const date2 = Temporal.ZonedDateTime.from({ era: "am", eraYear: 2000, monthCode: "M06", day: 15, hour: 12, minute: 34, timeZone: "UTC", calendar });
+TemporalHelpers.assertPlainDateTime(
+  date2.subtract(duration5).toPlainDateTime(),
+  2005, 6, "M06", 15, 12, 34, 0, 0, 0, 0, "Adding 5 years within incarnation era",
+  "am", 2005
+);
+
+const date3 = Temporal.ZonedDateTime.from({ era: "aa", eraYear: 5450, monthCode: "M07", day: 12, hour: 12, minute: 34, timeZone: "UTC", calendar });
+TemporalHelpers.assertPlainDateTime(
+  date3.subtract(duration5).toPlainDateTime(),
+  -45, 7, "M07", 12, 12, 34, 0, 0, 0, 0, "Adding 5 years within Amete Alem era",
+  "aa", 5455
+);