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672a555f98
The changes to tests are due to LibTimeZone incorrectly interpreting
time stamps in the TZDB. The TZDB will list zone transitions in either
UTC or the zone's local time (which is then subject to DST offsets).
LibTimeZone did not handle the latter at all.
For example:
The following rule is in effect until November 18, 6PM UTC.
America/Chicago -5:50:36 - LMT 1883 Nov 18 18:00u
The following rule is in effect until March 1, 2AM in Chicago time. But
at that time, a DST transition occurs, so the local time is actually
3AM.
America/Chicago -6:00 Chicago C%sT 1936 Mar 1 2:00
143 lines
3.5 KiB
C++
143 lines
3.5 KiB
C++
/*
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* Copyright (c) 2024, 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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#define AK_DONT_REPLACE_STD
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#include <AK/Array.h>
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#include <AK/NonnullOwnPtr.h>
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#include <AK/QuickSort.h>
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#include <LibUnicode/ICU.h>
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#include <LibUnicode/TimeZone.h>
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#include <unicode/timezone.h>
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#include <unicode/ucal.h>
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namespace Unicode {
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String current_time_zone()
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{
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UErrorCode status = U_ZERO_ERROR;
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auto time_zone = adopt_own_if_nonnull(icu::TimeZone::detectHostTimeZone());
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if (!time_zone)
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return "UTC"_string;
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icu::UnicodeString time_zone_id;
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time_zone->getID(time_zone_id);
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icu::UnicodeString time_zone_name;
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time_zone->getCanonicalID(time_zone_id, time_zone_name, status);
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if (icu_failure(status))
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return "UTC"_string;
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return icu_string_to_string(time_zone_name);
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}
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// https://github.com/unicode-org/icu/blob/main/icu4c/source/tools/tzcode/icuzones
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static constexpr bool is_legacy_non_iana_time_zone(StringView time_zone)
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{
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constexpr auto legacy_zones = to_array({
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"ACT"sv,
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"AET"sv,
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"AGT"sv,
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"ART"sv,
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"AST"sv,
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"BET"sv,
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"BST"sv,
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"Canada/East-Saskatchewan"sv,
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"CAT"sv,
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"CNT"sv,
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"CST"sv,
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"CTT"sv,
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"EAT"sv,
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"ECT"sv,
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"IET"sv,
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"IST"sv,
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"JST"sv,
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"MIT"sv,
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"NET"sv,
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"NST"sv,
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"PLT"sv,
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"PNT"sv,
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"PRT"sv,
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"PST"sv,
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"SST"sv,
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"US/Pacific-New"sv,
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"VST"sv,
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});
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if (time_zone.starts_with("SystemV/"sv))
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return true;
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return legacy_zones.contains_slow(time_zone);
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}
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static Vector<String> icu_available_time_zones(Optional<ByteString> const& region)
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{
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UErrorCode status = U_ZERO_ERROR;
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char const* icu_region = region.has_value() ? region->characters() : nullptr;
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auto time_zone_enumerator = adopt_own_if_nonnull(icu::TimeZone::createTimeZoneIDEnumeration(UCAL_ZONE_TYPE_ANY, icu_region, nullptr, status));
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if (icu_failure(status))
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return { "UTC"_string };
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auto time_zones = icu_string_enumeration_to_list(move(time_zone_enumerator), [](char const* zone) {
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return !is_legacy_non_iana_time_zone({ zone, strlen(zone) });
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});
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quick_sort(time_zones);
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return time_zones;
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}
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Vector<String> const& available_time_zones()
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{
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static auto time_zones = icu_available_time_zones({});
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return time_zones;
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}
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Vector<String> available_time_zones_in_region(StringView region)
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{
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return icu_available_time_zones(region);
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}
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Optional<String> resolve_primary_time_zone(StringView time_zone)
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{
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UErrorCode status = U_ZERO_ERROR;
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icu::UnicodeString iana_id;
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icu::TimeZone::getIanaID(icu_string(time_zone), iana_id, status);
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if (icu_failure(status))
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return {};
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return icu_string_to_string(iana_id);
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}
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Optional<TimeZoneOffset> time_zone_offset(StringView time_zone, UnixDateTime time)
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{
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UErrorCode status = U_ZERO_ERROR;
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auto icu_time_zone = adopt_own_if_nonnull(icu::TimeZone::createTimeZone(icu_string(time_zone)));
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if (!icu_time_zone || *icu_time_zone == icu::TimeZone::getUnknown())
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return {};
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i32 raw_offset = 0;
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i32 dst_offset = 0;
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icu_time_zone->getOffset(static_cast<UDate>(time.milliseconds_since_epoch()), 0, raw_offset, dst_offset, status);
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if (icu_failure(status))
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return {};
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return TimeZoneOffset {
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.offset = Duration::from_milliseconds(raw_offset + dst_offset),
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.in_dst = dst_offset == 0 ? TimeZoneOffset::InDST::No : TimeZoneOffset::InDST::Yes,
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};
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}
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}
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