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https://github.com/RGBCube/serenity
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09c0324880
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".
36 lines
1 KiB
C++
36 lines
1 KiB
C++
/*
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* Copyright (c) 2022, Tim Flynn <trflynn89@pm.me>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibTimeZone/TimeZone.h>
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namespace TimeZone {
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Optional<TimeZone> __attribute__((weak)) time_zone_from_string(StringView) { return {}; }
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StringView __attribute__((weak)) time_zone_to_string(TimeZone) { return {}; }
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Optional<StringView> canonicalize_time_zone(StringView time_zone)
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{
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auto maybe_time_zone = time_zone_from_string(time_zone);
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if (!maybe_time_zone.has_value())
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return {};
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auto canonical_time_zone = time_zone_to_string(*maybe_time_zone);
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if (canonical_time_zone.is_one_of("Etc/UTC"sv, "Etc/GMT"sv))
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return "UTC"sv;
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return canonical_time_zone;
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}
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Optional<i64> __attribute__((weak)) get_time_zone_offset(TimeZone, AK::Time) { return {}; }
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Optional<i64> get_time_zone_offset(StringView time_zone, AK::Time time)
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{
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if (auto maybe_time_zone = time_zone_from_string(time_zone); maybe_time_zone.has_value())
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return get_time_zone_offset(*maybe_time_zone, time);
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return {};
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}
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}
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