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// |reftest| skip-if(!this.hasOwnProperty('Temporal')) -- Temporal is not enabled unconditionally
// Copyright (C) 2024 Igalia, S.L. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-temporal.zoneddatetime.prototype.startofday
description: >
UTC offset shift returned by adjacent invocations of getOffsetNanosecondsFor
in DisambiguatePossibleInstants can be at most 24 hours.
features: [Temporal]
info: |
DisambiguatePossibleInstants:
18. If abs(_nanoseconds_) > nsPerDay, throw a *RangeError* exception.
---*/
let calls = 0;
class Shift24Hour extends Temporal.TimeZone {
id = 'TestTimeZone';
_shiftEpochNs = 0n
constructor() {
super('UTC');
}
getOffsetNanosecondsFor(instant) {
calls++;
if (instant.epochNanoseconds < this._shiftEpochNs) return -12 * 3600e9;
return 12 * 3600e9;
}
getPossibleInstantsFor(plainDateTime) {
const [utcInstant] = super.getPossibleInstantsFor(plainDateTime);
const { year, month, day } = plainDateTime;
if (year < 1970) return [utcInstant.subtract({ hours: 12 })];
if (year === 1970 && month === 1 && day === 1) return [];
return [utcInstant.add({ hours: 12 })];
}
}
const timeZone = new Shift24Hour();
const instance = new Temporal.ZonedDateTime(0n, timeZone);
instance.startOfDay();
assert(calls >= 2, "getOffsetNanosecondsFor should be called at least twice");
reportCompare(0, 0);
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