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LibTimeZone: Add an API to retrieve both daylight and standard offsets

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This API will also include the formatted name of the time zone, with
respect for DST (e.g. EST vs EDT for America/New_York).
This commit is contained in:
Timothy Flynn 2022-01-24 12:36:17 -05:00 • committed by Linus Groh
parent fc0c88344b
commit 7103012c7d
4 changed files with 87 additions and 1 deletions
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25
Tests/LibTimeZone/TestTimeZone.cpp
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@ -149,6 +149,31 @@ TEST_CASE(get_time_zone_offset_with_dst)
test_offset("Europe/Moscow"sv, -1589068800, offset(+1, 3, 00, 00), No); // Monday, August 25, 1919 12:00:00 AM
}
TEST_CASE(get_named_time_zone_offsets)
{
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) {
auto actual_offsets = TimeZone::get_named_time_zone_offsets(time_zone, AK::Time::from_seconds(time));
VERIFY(actual_offsets.has_value());
EXPECT_EQ(actual_offsets->at(0).seconds, expected_standard_offset);
EXPECT_EQ(actual_offsets->at(1).seconds, expected_daylight_offset);
EXPECT_EQ(actual_offsets->at(0).name, expected_standard_name);
EXPECT_EQ(actual_offsets->at(1).name, expected_daylight_name);
};
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
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
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
// Phoenix does not observe DST.
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
// Moscow's observed DST changed several times in 1919.
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
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
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
}
#else
TEST_CASE(time_zone_from_string)