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If you have a leap day, such as February 29, and you get input such as
{ monthCode: "M02", day: 30 }, { overflow: "constrain" }, then you want
the day to be constrained to the leap day February 29, not February 28
as the maximum day would be in a common year. Add tests for this case
for each supported calendar.
33 lines
961 B
JavaScript
33 lines
961 B
JavaScript
// 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.plainmonthday.from
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description: Properly constrain a day that is one past a leap day
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features: [Temporal]
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---*/
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const tests = [
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["buddhist", "M02", 30],
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["chinese", "M01", 31],
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["coptic", "M13", 7],
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["dangi", "M01", 31],
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["ethioaa", "M13", 7],
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["ethiopic", "M13", 7],
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["gregory", "M02", 30],
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["hebrew", "M02", 31],
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["indian", "M01", 32],
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["islamic-civil", "M01", 31],
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["islamic-tbla", "M01", 31],
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["islamic-umalqura", "M01", 31],
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["japanese", "M02", 30],
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["persian", "M12", 31],
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["roc", "M02", 30],
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];
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for (const [calendar, monthCode, day] of tests) {
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const md = Temporal.PlainMonthDay.from({ calendar, monthCode, day }, { overflow: "constrain" });
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assert.sameValue(md.day, day - 1,
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`${calendar}: ${monthCode}-${day} should constrain to ${day - 1}, not ${day - 2}`)
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}
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