era-boundary-islamic-tbla.js

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// |reftest| skip-if(!this.hasOwnProperty('Temporal')) -- Temporal is not enabled unconditionally

// 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.plainyearmonth.from

description: Non-positive era years are remapped in islamic-tbla calendar

includes: [temporalHelpers.js]

features: [Temporal, Intl.Era-monthcode]

---*/

const calendar = "islamic-tbla";

const options = { overflow: "reject" };

const ah0 = Temporal.PlainYearMonth.from({ era: "ah", eraYear: 0, monthCode: "M01", calendar }, options);

TemporalHelpers.assertPlainYearMonth(

  ah0,

  0, 1, "M01", "AH 0 resolves to BH 1",

  "bh", 1, null);

const ah1n = Temporal.PlainYearMonth.from({ era: "ah", eraYear: -1, monthCode: "M01", calendar }, options);

TemporalHelpers.assertPlainYearMonth(

  ah1n,

  -1, 1, "M01", "AH -1 resolves to BH 2",

  "bh", 2, null);

const bh0 = Temporal.PlainYearMonth.from({ era: "bh", eraYear: 0, monthCode: "M01", calendar }, options);

TemporalHelpers.assertPlainYearMonth(

  bh0,

  1, 1, "M01", "BH 0 resolves to AH 1",

  "ah", 1, null);

const bh1n = Temporal.PlainYearMonth.from({ era: "bh", eraYear: -1, monthCode: "M01", calendar }, options);

TemporalHelpers.assertPlainYearMonth(

  bh1n,

  2, 1, "M01", "BH -1 resolves to AH 2",

  "ah", 2, null);

reportCompare(0, 0);