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ed612d835d
Commit c3fd455 changed LibTimeZone to fall back to the system time zone
when we fail to parse the TZ environment variable. This behavior differs
from both our LibC and glibc; they abort parsing and default to UTC.
This changes LibTimeZone to behave the same way to avoid a very awkward
situation where some parts of the codebase thinks the timezone is UTC,
and others think the timezone is whatever /etc/timezone indicates.
232 lines
11 KiB
C++
232 lines
11 KiB
C++
/*
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* Copyright (c) 2022, Tim Flynn <trflynn89@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibTest/TestCase.h>
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#include <AK/StringView.h>
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#include <AK/Time.h>
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#include <LibTimeZone/TimeZone.h>
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using enum TimeZone::InDST;
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static void test_offset(StringView time_zone, i64 time, i64 expected_offset, TimeZone::InDST expected_in_dst)
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{
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auto actual_offset = TimeZone::get_time_zone_offset(time_zone, AK::Time::from_seconds(time));
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VERIFY(actual_offset.has_value());
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EXPECT_EQ(actual_offset->seconds, expected_offset);
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EXPECT_EQ(actual_offset->in_dst, expected_in_dst);
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}
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#if ENABLE_TIME_ZONE_DATA
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# include <LibTimeZone/TimeZoneData.h>
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class TimeZoneGuard {
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public:
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explicit TimeZoneGuard(char const* tz)
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: m_tz(getenv("TZ"))
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{
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setenv("TZ", tz, 1);
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}
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~TimeZoneGuard()
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{
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if (m_tz)
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setenv("TZ", m_tz, 1);
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else
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unsetenv("TZ");
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}
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private:
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char const* m_tz { nullptr };
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};
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TEST_CASE(time_zone_from_string)
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{
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EXPECT_EQ(TimeZone::time_zone_from_string("America/New_York"sv), TimeZone::TimeZone::America_New_York);
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EXPECT_EQ(TimeZone::time_zone_from_string("Europe/Paris"sv), TimeZone::TimeZone::Europe_Paris);
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EXPECT_EQ(TimeZone::time_zone_from_string("Etc/GMT+2"sv), TimeZone::TimeZone::Etc_GMT_Ahead_2);
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EXPECT_EQ(TimeZone::time_zone_from_string("Etc/GMT-5"sv), TimeZone::TimeZone::Etc_GMT_Behind_5);
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EXPECT(!TimeZone::time_zone_from_string("I don't exist"sv).has_value());
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}
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TEST_CASE(time_zone_from_string_link)
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{
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auto test_link = [](auto tz1, auto tz2) {
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auto result1 = TimeZone::time_zone_from_string(tz1);
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EXPECT(result1.has_value());
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auto result2 = TimeZone::time_zone_from_string(tz2);
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EXPECT(result2.has_value());
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EXPECT_EQ(*result1, *result2);
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};
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test_link("America/New_York"sv, "US/Eastern"sv);
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test_link("Etc/GMT"sv, "GMT"sv);
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test_link("Etc/GMT+0"sv, "GMT"sv);
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test_link("Etc/GMT-0"sv, "GMT"sv);
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test_link("Etc/UTC"sv, "UTC"sv);
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test_link("Etc/Universal"sv, "UTC"sv);
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test_link("Universal"sv, "UTC"sv);
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}
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TEST_CASE(case_insensitive_time_zone_from_string)
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{
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EXPECT_EQ(TimeZone::time_zone_from_string("UTC"sv), TimeZone::TimeZone::UTC);
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EXPECT_EQ(TimeZone::time_zone_from_string("utc"sv), TimeZone::TimeZone::UTC);
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EXPECT_EQ(TimeZone::time_zone_from_string("uTc"sv), TimeZone::TimeZone::UTC);
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}
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TEST_CASE(time_zone_to_string)
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{
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EXPECT_EQ(TimeZone::time_zone_to_string(TimeZone::TimeZone::America_New_York), "America/New_York"sv);
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EXPECT_EQ(TimeZone::time_zone_to_string(TimeZone::TimeZone::Europe_Paris), "Europe/Paris"sv);
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EXPECT_EQ(TimeZone::time_zone_to_string(TimeZone::TimeZone::Etc_GMT_Ahead_2), "Etc/GMT+2"sv);
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EXPECT_EQ(TimeZone::time_zone_to_string(TimeZone::TimeZone::Etc_GMT_Behind_5), "Etc/GMT-5"sv);
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}
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TEST_CASE(time_zone_to_string_link)
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{
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EXPECT_EQ(TimeZone::time_zone_to_string(TimeZone::TimeZone::Etc_UTC), "Etc/UTC"sv);
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EXPECT_EQ(TimeZone::time_zone_to_string(TimeZone::TimeZone::UTC), "Etc/UTC"sv);
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EXPECT_EQ(TimeZone::time_zone_to_string(TimeZone::TimeZone::Universal), "Etc/UTC"sv);
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EXPECT_EQ(TimeZone::time_zone_to_string(TimeZone::TimeZone::Etc_Universal), "Etc/UTC"sv);
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}
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TEST_CASE(canonicalize_time_zone)
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{
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EXPECT_EQ(TimeZone::canonicalize_time_zone("America/New_York"sv), "America/New_York"sv);
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EXPECT_EQ(TimeZone::canonicalize_time_zone("AmErIcA/NeW_YoRk"sv), "America/New_York"sv);
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EXPECT_EQ(TimeZone::canonicalize_time_zone("UTC"sv), "UTC"sv);
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EXPECT_EQ(TimeZone::canonicalize_time_zone("GMT"sv), "UTC"sv);
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EXPECT_EQ(TimeZone::canonicalize_time_zone("GMT+0"sv), "UTC"sv);
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EXPECT_EQ(TimeZone::canonicalize_time_zone("GMT-0"sv), "UTC"sv);
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EXPECT_EQ(TimeZone::canonicalize_time_zone("Etc/UTC"sv), "UTC"sv);
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EXPECT_EQ(TimeZone::canonicalize_time_zone("Etc/GMT"sv), "UTC"sv);
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EXPECT(!TimeZone::canonicalize_time_zone("I don't exist"sv).has_value());
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}
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TEST_CASE(invalid_time_zone)
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{
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TimeZoneGuard guard { "ladybird" };
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EXPECT_EQ(TimeZone::current_time_zone(), "UTC"sv);
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}
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static i64 offset(i64 sign, i64 hours, i64 minutes, i64 seconds)
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{
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return sign * ((hours * 3600) + (minutes * 60) + seconds);
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}
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TEST_CASE(get_time_zone_offset)
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{
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test_offset("America/Chicago"sv, -2717668237, offset(-1, 5, 50, 36), No); // Sunday, November 18, 1883 12:09:23 PM
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test_offset("America/Chicago"sv, -2717668236, offset(-1, 6, 00, 00), No); // Sunday, November 18, 1883 12:09:24 PM
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test_offset("America/Chicago"sv, -1067810460, offset(-1, 6, 00, 00), No); // Sunday, March 1, 1936 1:59:00 AM
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test_offset("America/Chicago"sv, -1067810400, offset(-1, 5, 00, 00), No); // Sunday, March 1, 1936 2:00:00 AM
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test_offset("America/Chicago"sv, -1045432860, offset(-1, 5, 00, 00), No); // Sunday, November 15, 1936 1:59:00 AM
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test_offset("America/Chicago"sv, -1045432800, offset(-1, 6, 00, 00), No); // Sunday, November 15, 1936 2:00:00 AM
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test_offset("Europe/London"sv, -3852662401, offset(-1, 0, 01, 15), No); // Tuesday, November 30, 1847 11:59:59 PM
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test_offset("Europe/London"sv, -3852662400, offset(+1, 0, 00, 00), No); // Wednesday, December 1, 1847 12:00:00 AM
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test_offset("Europe/London"sv, -37238401, offset(+1, 0, 00, 00), No); // Saturday, October 26, 1968 11:59:59 PM
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test_offset("Europe/London"sv, -37238400, offset(+1, 1, 00, 00), No); // Sunday, October 27, 1968 12:00:00 AM
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test_offset("Europe/London"sv, 57722399, offset(+1, 1, 00, 00), No); // Sunday, October 31, 1971 1:59:59 AM
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test_offset("Europe/London"sv, 57722400, offset(+1, 0, 00, 00), No); // Sunday, October 31, 1971 2:00:00 AM
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test_offset("UTC"sv, -1641846268, offset(+1, 0, 00, 00), No);
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test_offset("UTC"sv, 0, offset(+1, 0, 00, 00), No);
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test_offset("UTC"sv, 1641846268, offset(+1, 0, 00, 00), No);
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test_offset("Etc/GMT+4"sv, -1641846268, offset(-1, 4, 00, 00), No);
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test_offset("Etc/GMT+5"sv, 0, offset(-1, 5, 00, 00), No);
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test_offset("Etc/GMT+6"sv, 1641846268, offset(-1, 6, 00, 00), No);
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test_offset("Etc/GMT-12"sv, -1641846268, offset(+1, 12, 00, 00), No);
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test_offset("Etc/GMT-13"sv, 0, offset(+1, 13, 00, 00), No);
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test_offset("Etc/GMT-14"sv, 1641846268, offset(+1, 14, 00, 00), No);
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EXPECT(!TimeZone::get_time_zone_offset("I don't exist"sv, {}).has_value());
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}
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TEST_CASE(get_time_zone_offset_with_dst)
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{
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test_offset("America/New_York"sv, 1642558528, offset(-1, 5, 00, 00), No); // Wednesday, January 19, 2022 2:15:28 AM
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test_offset("America/New_York"sv, 1663553728, offset(-1, 4, 00, 00), Yes); // Monday, September 19, 2022 2:15:28 AM
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test_offset("America/New_York"sv, 1671453238, offset(-1, 5, 00, 00), No); // Monday, December 19, 2022 12:33:58 PM
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// Phoenix does not observe DST.
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test_offset("America/Phoenix"sv, 1642558528, offset(-1, 7, 00, 00), No); // Wednesday, January 19, 2022 2:15:28 AM
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test_offset("America/Phoenix"sv, 1663553728, offset(-1, 7, 00, 00), No); // Monday, September 19, 2022 2:15:28 AM
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test_offset("America/Phoenix"sv, 1671453238, offset(-1, 7, 00, 00), No); // Monday, December 19, 2022 12:33:58 PM
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// Moscow's observed DST changed several times in 1919.
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test_offset("Europe/Moscow"sv, -1609459200, offset(+1, 2, 31, 19), No); // Wednesday, January 1, 1919 12:00:00 AM
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test_offset("Europe/Moscow"sv, -1596412800, offset(+1, 4, 31, 19), Yes); // Sunday, June 1, 1919 12:00:00 AM
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test_offset("Europe/Moscow"sv, -1592611200, offset(+1, 4, 00, 00), Yes); // Tuesday, July 15, 1919 12:00:00 AM
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test_offset("Europe/Moscow"sv, -1589068800, offset(+1, 3, 00, 00), No); // Monday, August 25, 1919 12:00:00 AM
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// Paraguay begins the year in DST.
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test_offset("America/Asuncion"sv, 1642558528, offset(-1, 3, 00, 00), Yes); // Wednesday, January 19, 2022 2:15:28 AM
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test_offset("America/Asuncion"sv, 1663553728, offset(-1, 4, 00, 00), No); // Monday, September 19, 2022 2:15:28 AM
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test_offset("America/Asuncion"sv, 1671453238, offset(-1, 3, 00, 00), Yes); // Monday, December 19, 2022 12:33:58 PM
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}
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TEST_CASE(get_named_time_zone_offsets)
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{
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auto test_named_offsets = [](auto time_zone, i64 time, i64 expected_standard_offset, i64 expected_daylight_offset, auto expected_standard_name, auto expected_daylight_name) {
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auto actual_offsets = TimeZone::get_named_time_zone_offsets(time_zone, AK::Time::from_seconds(time));
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VERIFY(actual_offsets.has_value());
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EXPECT_EQ(actual_offsets->at(0).seconds, expected_standard_offset);
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EXPECT_EQ(actual_offsets->at(1).seconds, expected_daylight_offset);
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EXPECT_EQ(actual_offsets->at(0).name, expected_standard_name);
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EXPECT_EQ(actual_offsets->at(1).name, expected_daylight_name);
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};
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test_named_offsets("America/New_York"sv, 1642558528, offset(-1, 5, 00, 00), offset(-1, 4, 00, 00), "EST"sv, "EDT"sv); // Wednesday, January 19, 2022 2:15:28 AM
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test_named_offsets("UTC"sv, 1642558528, offset(+1, 0, 00, 00), offset(+1, 0, 00, 00), "UTC"sv, "UTC"sv); // Wednesday, January 19, 2022 2:15:28 AM
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test_named_offsets("GMT"sv, 1642558528, offset(+1, 0, 00, 00), offset(+1, 0, 00, 00), "GMT"sv, "GMT"sv); // Wednesday, January 19, 2022 2:15:28 AM
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// Phoenix does not observe DST.
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test_named_offsets("America/Phoenix"sv, 1642558528, offset(-1, 7, 00, 00), offset(-1, 7, 00, 00), "MST"sv, "MST"sv); // Wednesday, January 19, 2022 2:15:28 AM
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// Moscow's observed DST changed several times in 1919.
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test_named_offsets("Europe/Moscow"sv, -1609459200, offset(+1, 2, 31, 19), offset(+1, 3, 31, 19), "MSK"sv, "MSD"sv); // Wednesday, January 1, 1919 12:00:00 AM
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test_named_offsets("Europe/Moscow"sv, -1596412800, offset(+1, 2, 31, 19), offset(+1, 4, 31, 19), "MSK"sv, "MDST"sv); // Sunday, June 1, 1919 12:00:00 AM
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test_named_offsets("Europe/Moscow"sv, -1589068800, offset(+1, 3, 00, 00), offset(+1, 4, 00, 00), "MSK"sv, "MSD"sv); // Monday, August 25, 1919 12:00:00 AM
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// Shanghai's DST rules end in 1991.
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test_named_offsets("Asia/Shanghai"sv, 694223999, offset(+1, 8, 00, 00), offset(+1, 9, 00, 00), "CST"sv, "CDT"sv); // Tuesday, December 31, 1991 11:59:59 PM
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test_named_offsets("Asia/Shanghai"sv, 694224000, offset(+1, 8, 00, 00), offset(+1, 8, 00, 00), "CST"sv, "CST"sv); // Wednesday, January 1, 1992 12:00:00 AM
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}
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#else
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TEST_CASE(time_zone_from_string)
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{
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EXPECT(TimeZone::time_zone_from_string("UTC"sv).has_value());
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EXPECT(!TimeZone::time_zone_from_string("Europe/Paris"sv).has_value());
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EXPECT(!TimeZone::time_zone_from_string("Etc/UTC"sv).has_value());
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EXPECT(!TimeZone::time_zone_from_string("I don't exist"sv).has_value());
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}
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TEST_CASE(get_time_zone_offset)
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{
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test_offset("UTC"sv, 123456, 0, No);
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EXPECT(!TimeZone::get_time_zone_offset("Europe/Paris"sv, {}).has_value());
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EXPECT(!TimeZone::get_time_zone_offset("Etc/UTC"sv, {}).has_value());
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EXPECT(!TimeZone::get_time_zone_offset("I don't exist"sv, {}).has_value());
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}
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#endif
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