geodataparser_time.h

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/* ============================================================
 *
 * This file is a part of digiKam project
 * https://www.digikam.org
 *
 * Date        : 2010-01-17
 * Description : A function to parse time strings to QDateTime.
 *               Put into an extra file for easier testing.
 *
 * Copyright (C) 2010      by Michael G. Hansen <mike at mghansen dot de>
 * Copyright (C) 2017-2022 by Gilles Caulier <caulier dot gilles at gmail dot com>
 *
 * This program is free software; you can redistribute it
 * and/or modify it under the terms of the GNU General
 * Public License as published by the Free Software Foundation;
 * either version 2, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * ============================================================ */
 
#ifndef DIGIKAM_GEO_DATA_PARSER_TIME_H
#define DIGIKAM_GEO_DATA_PARSER_TIME_H
 
// Qt includes
 
#include <QDateTime>
 
namespace DigikamGenericGeolocationEditPlugin
{
 
QDateTime GeoDataParserParseTime(QString timeString)
{
    if (timeString.isEmpty())
    {
        return QDateTime();
    }
 
    // we want to be able to parse these formats:
    // "2010-01-14T09:26:02.287-02:00" <-- here we have to cut off the -02:00 and replace it with 'Z'
    // "2010-01-14T09:26:02.287+02:00" <-- here we have to cut off the +02:00 and replace it with 'Z'
    // "2009-03-11T13:39:55.622Z"
 
    const int timeStringLength      = timeString.length();
    const int timeZoneSignPosition  = timeStringLength-6;
 
    // does the string contain a timezone offset?
 
    int timeZoneOffsetSeconds       = 0;
    const int timeZonePlusPosition  = timeString.lastIndexOf(QLatin1Char('+'));
    const int timeZoneMinusPosition = timeString.lastIndexOf(QLatin1Char('-'));
 
    if ((timeZonePlusPosition  == timeZoneSignPosition) ||
        (timeZoneMinusPosition == timeZoneSignPosition))
    {
        const int timeZoneSign       = (timeZonePlusPosition == timeZoneSignPosition) ? +1 : -1;
 
        // cut off the last digits:
 
        const QString timeZoneString = timeString.right(6);
        timeString.chop(6);
        timeString                  += QLatin1Char('Z');
 
        // determine the time zone offset:
 
        bool okayHour                = false;
        bool okayMinute              = false;
        const int hourOffset         = timeZoneString.mid(1, 2).toInt(&okayHour);
        const int minuteOffset       = timeZoneString.mid(4, 2).toInt(&okayMinute);
 
        if (okayHour && okayMinute)
        {
            timeZoneOffsetSeconds  = hourOffset*3600 + minuteOffset*60;
            timeZoneOffsetSeconds *= timeZoneSign;
        }
    }
 
    QDateTime theTime = QDateTime::fromString(timeString, Qt::ISODate);
    theTime           = theTime.addSecs(-timeZoneOffsetSeconds);
 
    return theTime;
}
 
} // namespace DigikamGenericGeolocationEditPlugin
 
#endif // DIGIKAM_GEO_DATA_PARSER_TIME_H