era-boundary-gregory.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 gregory calendar

includes: [temporalHelpers.js]

features: [Temporal, Intl.Era-monthcode]

---*/

const calendar = "gregory";

const options = { overflow: "reject" };

const ce0 = Temporal.PlainYearMonth.from({ era: "ce", eraYear: 0, monthCode: "M01", calendar }, options);

TemporalHelpers.assertPlainYearMonth(

  ce0,

  0, 1, "M01", "CE 0 resolves to BCE 1",

  "bce", 1);

const ce1n = Temporal.PlainYearMonth.from({ era: "ce", eraYear: -1, monthCode: "M01", calendar }, options);

TemporalHelpers.assertPlainYearMonth(

  ce1n,

  -1, 1, "M01", "CE -1 resolves to BCE 2",

  "bce", 2);

const bce0 = Temporal.PlainYearMonth.from({ era: "bce", eraYear: 0, monthCode: "M01", calendar }, options);

TemporalHelpers.assertPlainYearMonth(

  bce0,

  1, 1, "M01", "BCE 0 resolves to CE 1",

  "ce", 1);

const bce1n = Temporal.PlainYearMonth.from({ era: "bce", eraYear: -1, monthCode: "M01", calendar }, options);

TemporalHelpers.assertPlainYearMonth(

  bce1n,

  2, 1, "M01", "BCE -1 resolves to CE 2",

  "ce", 2);

reportCompare(0, 0);