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These tests add coverage for a corner case in the TZDB. In spring 1919, the America/Toronto time zone switched to DST at 23:30 on March 30th, skipping an hour ahead to 00:30 on March 31st. This meant that both March 30th and March 31st were 23.5-hour days. See: https://github.com/tc39/proposal-temporal/issues/2910
25 lines
1.0 KiB
JavaScript
25 lines
1.0 KiB
JavaScript
// Copyright (C) 2024 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.zoneddatetime.from
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description: Test TZDB edge case where start of day is not 00:00 nor 01:00
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includes: [temporalHelpers.js]
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features: [Temporal]
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---*/
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// DST spring-forward hour skipped from 1919-03-30T23:30 to 1919-03-31T00:30, so
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// day starts at 00:30
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const startOfDay = Temporal.ZonedDateTime.from("1919-03-31[America/Toronto]");
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const midnightDisambiguated = Temporal.ZonedDateTime.from("1919-03-31T00[America/Toronto]");
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TemporalHelpers.assertDuration(
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startOfDay.until(midnightDisambiguated),
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0, 0, 0, 0, 0, /* minutes = */ 30, 0, 0, 0, 0,
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"start of day is 30 minutes earlier than following the disambiguation strategy for midnight"
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);
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assert.sameValue(
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midnightDisambiguated.epochNanoseconds,
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Temporal.ZonedDateTime.from({ year: 1919, month: 3, day: 31, timeZone: "America/Toronto" }).epochNanoseconds,
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"start of day magic doesn't happen with property bag, missing properties are zero"
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);
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