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LibTimeZone: Begin generating GMT offset rules for each time zone

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This is a rather naive implementation, but serves as a first pass at
determining the GMT offset for a time zone at a particular point in
time. This implementation ignores DST (because we are not parsing any
RULE entries yet), and ignores any offset patterns of the form "Mon>4"
or "lastSun".
This commit is contained in:
Timothy Flynn 2022-01-10 16:56:09 -05:00 • committed by Linus Groh
parent e9c42d0bc5
commit 09c0324880
4 changed files with 199 additions and 34 deletions
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42
Tests/LibTimeZone/TestTimeZone.cpp
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@ -7,6 +7,7 @@
#include <LibTest/TestCase.h>
#include <AK/StringView.h>
#include <AK/Time.h>
#include <LibTimeZone/TimeZone.h>
#if ENABLE_TIME_ZONE_DATA
@ -84,4 +85,45 @@ TEST_CASE(canonicalize_time_zone)
EXPECT(!TimeZone::canonicalize_time_zone("I don't exist"sv).has_value());
}
TEST_CASE(get_time_zone_offset)
{
auto offset = [](i64 sign, i64 hours, i64 minutes, i64 seconds) {
return sign * ((hours * 3600) + (minutes * 60) + seconds);
};
auto test_offset = [](auto time_zone, i64 time, i64 expected_offset) {
auto actual_offset = TimeZone::get_time_zone_offset(time_zone, AK::Time::from_seconds(time));
VERIFY(actual_offset.has_value());
EXPECT_EQ(*actual_offset, expected_offset);
};
test_offset("America/Chicago"sv, -2717668237, offset(-1, 5, 50, 36)); // Sunday, November 18, 1883 12:09:23 PM
test_offset("America/Chicago"sv, -2717668236, offset(-1, 6, 00, 00)); // Sunday, November 18, 1883 12:09:24 PM
test_offset("America/Chicago"sv, -1067810460, offset(-1, 6, 00, 00)); // Sunday, March 1, 1936 1:59:00 AM
test_offset("America/Chicago"sv, -1067810400, offset(-1, 5, 00, 00)); // Sunday, March 1, 1936 2:00:00 AM
test_offset("America/Chicago"sv, -1045432860, offset(-1, 5, 00, 00)); // Sunday, November 15, 1936 1:59:00 AM
test_offset("America/Chicago"sv, -1045432800, offset(-1, 6, 00, 00)); // Sunday, November 15, 1936 2:00:00 AM
test_offset("Europe/London"sv, -3852662401, offset(-1, 0, 01, 15)); // Tuesday, November 30, 1847 11:59:59 PM
test_offset("Europe/London"sv, -3852662400, offset(+1, 0, 00, 00)); // Wednesday, December 1, 1847 12:00:00 AM
test_offset("Europe/London"sv, -37238401, offset(+1, 0, 00, 00)); // Saturday, October 26, 1968 11:59:59 PM
test_offset("Europe/London"sv, -37238400, offset(+1, 1, 00, 00)); // Sunday, October 27, 1968 12:00:00 AM
test_offset("Europe/London"sv, 57722399, offset(+1, 1, 00, 00)); // Sunday, October 31, 1971 1:59:59 AM
test_offset("Europe/London"sv, 57722400, offset(+1, 0, 00, 00)); // Sunday, October 31, 1971 2:00:00 AM
test_offset("UTC"sv, -1641846268, offset(+1, 0, 00, 00));
test_offset("UTC"sv, 0, offset(+1, 0, 00, 00));
test_offset("UTC"sv, 1641846268, offset(+1, 0, 00, 00));
test_offset("Etc/GMT+4"sv, -1641846268, offset(-1, 4, 00, 00));
test_offset("Etc/GMT+5"sv, 0, offset(-1, 5, 00, 00));
test_offset("Etc/GMT+6"sv, 1641846268, offset(-1, 6, 00, 00));
test_offset("Etc/GMT-12"sv, -1641846268, offset(+1, 12, 00, 00));
test_offset("Etc/GMT-13"sv, 0, offset(+1, 13, 00, 00));
test_offset("Etc/GMT-14"sv, 1641846268, offset(+1, 14, 00, 00));
EXPECT(!TimeZone::get_time_zone_offset("I don't exist"sv, {}).has_value());
}
#endif