mirror of https://github.com/tc39/test262.git
81 lines
2.6 KiB
JavaScript
81 lines
2.6 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 TemporalHelpers.oneShiftTimeZone()
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against known cases in 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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function checkTimeZoneArithmetic(shiftInstant, shiftNs, realTimeZoneName, shiftWallTime) {
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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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return;
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const tz = TemporalHelpers.oneShiftTimeZone(shiftInstant, shiftNs);
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const realTz = new Temporal.TimeZone(realTimeZoneName);
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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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assert.compareArray(
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tz.getPossibleInstantsFor(shiftWallTime).map((i) => i.epochNanoseconds),
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realTz.getPossibleInstantsFor(shiftWallTime).map((i) => i.epochNanoseconds),
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'possible instants for wall time'
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);
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const before1 = shiftWallTime.subtract({ hours: 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 hour before wall time'
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);
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const after1 = shiftWallTime.add({ hours: 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 hour after wall time'
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);
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}
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// Check a positive DST shift from +00:00 to +01:00
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checkTimeZoneArithmetic(
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new Temporal.Instant(1616893200000000000n),
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3600e9,
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'Europe/London',
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new Temporal.PlainDateTime(2021, 3, 28, 1)
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);
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// Check a negative DST shift from +00:00 to -01:00
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checkTimeZoneArithmetic(
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new Temporal.Instant(1635642000000000000n),
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-3600e9,
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'Atlantic/Azores',
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new Temporal.PlainDateTime(2021, 10, 31, 1)
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);
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// Check the no-shift case
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checkTimeZoneArithmetic(
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new Temporal.Instant(0n),
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0,
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'UTC',
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new Temporal.PlainDateTime(1970, 1, 1)
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);
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