mirror of https://github.com/tc39/test262.git
57 lines
2.2 KiB
JavaScript
57 lines
2.2 KiB
JavaScript
// Copyright (C) 2022 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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description: >
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Verify the time zone arithmetic used in
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TemporalHelpers.crossDateLineTimeZone() against the Pacific/Apia time zone in
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the implementation's time zone database
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includes: [compareArray.js, temporalHelpers.js]
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features: [Temporal]
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---*/
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// No need to test this on hosts that don't provide an Intl object. It's
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// sufficient that the logic is tested on at least one host.
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if (typeof globalThis.Intl !== "undefined") {
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const tz = TemporalHelpers.crossDateLineTimeZone();
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const realTz = new Temporal.TimeZone('Pacific/Apia');
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const shiftInstant = Temporal.Instant.from('2011-12-30T10:00:00Z');
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assert.sameValue(
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tz.getOffsetNanosecondsFor(shiftInstant),
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realTz.getOffsetNanosecondsFor(shiftInstant),
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'offset at shift instant'
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);
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const minus1 = shiftInstant.subtract({ hours: 1 });
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assert.sameValue(
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tz.getOffsetNanosecondsFor(minus1),
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realTz.getOffsetNanosecondsFor(minus1),
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'offset at 1 hour before shift'
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);
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const plus1 = shiftInstant.add({ hours: 1 });
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assert.sameValue(
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tz.getOffsetNanosecondsFor(plus1),
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realTz.getOffsetNanosecondsFor(plus1),
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'offset at 1 hour after shift'
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);
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const middleOfSkippedDayWallTime = Temporal.PlainDateTime.from("2011-12-30T12:00");
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assert.compareArray(
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tz.getPossibleInstantsFor(middleOfSkippedDayWallTime).map((i) => i.epochNanoseconds),
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realTz.getPossibleInstantsFor(middleOfSkippedDayWallTime).map((i) => i.epochNanoseconds),
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'possible instants for middle of skipped day wall time'
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);
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const before1 = middleOfSkippedDayWallTime.subtract({ days: 1 });
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assert.compareArray(
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tz.getPossibleInstantsFor(before1).map((i) => i.epochNanoseconds),
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realTz.getPossibleInstantsFor(before1).map((i) => i.epochNanoseconds),
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'possible instants for 1 day before skipped day'
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);
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const after1 = middleOfSkippedDayWallTime.add({ days: 1 });
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assert.compareArray(
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tz.getPossibleInstantsFor(after1).map((i) => i.epochNanoseconds),
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realTz.getPossibleInstantsFor(after1).map((i) => i.epochNanoseconds),
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'possible instants for 1 day after skipped day'
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);
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}
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