timezonemanager.cpp

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// Copyright (C) 2025 The Qt Company Ltd.

// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause

#include "timezonemanager.h"

#include "dialog.h"

#include <memory>

TimeZoneManager::TimeZoneManager(QObject *parent) : QObject(parent)

    setTimeZone(QString::fromLatin1(QTimeZone::systemTimeZoneId()));

TimeZoneManager::~TimeZoneManager() { }

void TimeZoneManager::openDialog()

    if (!m_dialog) {

        m_dialog = std::make_unique<Dialog>();

        m_dialog->setModal(true);

        connect(m_dialog.get(), &Dialog::timeZoneSelected, this, &TimeZoneManager::setTimeZone);

    m_dialog->show();

qint64 TimeZoneManager::currentTimeZoneOffsetMs()

    const QTimeZone tz(m_timeZone.toLatin1());

    if (!tz.isValid())

        return 0;

    const QDateTime nowUtc = QDateTime::currentDateTimeUtc();

    const int targetOffset = tz.offsetFromUtc(nowUtc);

    const int systemOffset = QTimeZone::systemTimeZone().offsetFromUtc(nowUtc);

    return (targetOffset - systemOffset) * 1000;

void TimeZoneManager::setTimeZone(const QString &timeZone)

    if (m_timeZone != timeZone) {

        m_timeZone = timeZone;

        emit timeZoneChanged();