Source/WTF/wtf/TimeZone.cpp

/*
 * Copyright (C) 2026 Igalia S.L.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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 */

#include "config.h"
#include <wtf/TimeZone.h>

#include <atomic>
#include <wtf/DateMath.h>
#include <wtf/text/WTFString.h>

namespace WTF {

static std::atomic<uint64_t> g_lastTimeZoneID { 1 };

uint64_t lastTimeZoneID()
{
    return g_lastTimeZoneID.load(std::memory_order_relaxed);
}

void timeZoneDidChange()
{
    g_lastTimeZoneID.fetch_add(1, std::memory_order_relaxed);
}

#if !USE(TIME_ZONE_CHANGE_NOTIFICATIONS)
void listenForTimeZoneChangeNotifications() { }
#endif

bool setHostTimeZoneForTesting(const String& timeZone)
{
    if (!setTimeZoneOverride(timeZone))
        return false;
    timeZoneDidChange();
    return true;
}

} // namespace WTF