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timeconversion.cpp

/**********************************************************************
** Copyright (C) 2000 Trolltech AS.  All rights reserved.
**
** This file is part of Qtopia Environment.
**
** This file may be distributed and/or modified under the terms of the
** GNU General Public License version 2 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
** See http://www.trolltech.com/gpl/ for GPL licensing information.
**
** Contact info@trolltech.com if any conditions of this licensing are
** not clear to you.
**
**********************************************************************/

#include <qglobal.h>
#include <qtopia/timeconversion.h>
#include <qregexp.h>
#include <stdlib.h>

QString TimeConversion::toString( const QDate &d )
{
//  QString empty;
//  if ( d.isNull() )
//      return empty;

    QString r = QString::number( d.day() ) + "." +
        QString::number( d.month() ) + "." +
        QString::number( d.year() );
    //qDebug("TimeConversion::toString %s", r.latin1());

    return r;
}

QDate TimeConversion::fromString( const QString &datestr )
{
//     QDate empty;
//     if ( datestr.isEmpty() )
//      return empty;

    int monthPos = datestr.find('.');
    int yearPos = datestr.find('.', monthPos+1 );
    if ( monthPos == -1 || yearPos == -1 ) {
    qDebug("fromString didn't find . in str = %s; mpos = %d ypos = %d", datestr.latin1(), monthPos, yearPos );
    return QDate();
    }
    int d = datestr.left( monthPos ).toInt();
    int m = datestr.mid( monthPos+1, yearPos - monthPos - 1 ).toInt();
    int y = datestr.mid( yearPos+1 ).toInt();
    QDate date ( y,m,d );
    //qDebug("TimeConversion::fromString ymd = %s => %d %d %d; mpos = %d ypos = %d", datestr.latin1(), y, m, d, monthPos, yearPos);
    return date;
}

time_t TimeConversion::toUTC( const QDateTime& dt )
{
    time_t tmp;
    struct tm *lt;

#if defined(_OS_WIN32) || defined (Q_OS_WIN32) || defined (Q_OS_WIN64)
    _tzset();
#else
    tzset();
#endif

    // get a tm structure from the system to get the correct tz_name
    tmp = time( 0 );
    lt = localtime( &tmp );

    lt->tm_sec = dt.time().second();
    lt->tm_min = dt.time().minute();
    lt->tm_hour = dt.time().hour();
    lt->tm_mday = dt.date().day();
    lt->tm_mon = dt.date().month() - 1; // 0-11 instead of 1-12
    lt->tm_year = dt.date().year() - 1900; // year - 1900
    //lt->tm_wday = dt.date().dayOfWeek(); ignored anyway
    //lt->tm_yday = dt.date().dayOfYear(); ignored anyway
    lt->tm_wday = -1;
    lt->tm_yday = -1;
    // tm_isdst negative -> mktime will find out about DST
    lt->tm_isdst = -1;
    // keep tm_zone and tm_gmtoff
    tmp = mktime( lt );
    return tmp;
}

QDateTime TimeConversion::fromUTC( time_t time )
{
    struct tm *lt;

#if defined(_OS_WIN32) || defined (Q_OS_WIN32) || defined (Q_OS_WIN64)
    _tzset();
#else
    tzset();
#endif
    lt = localtime( &time );
    QDateTime dt;
    dt.setDate( QDate( lt->tm_year + 1900, lt->tm_mon + 1, lt->tm_mday ) );
    dt.setTime( QTime( lt->tm_hour, lt->tm_min, lt->tm_sec ) );
    return dt;
}


int TimeConversion::secsTo( const QDateTime &from, const QDateTime &to )
{
    return toUTC( to ) - toUTC( from );
}

QCString TimeConversion::toISO8601( const QDate &d )
{
    time_t tmp = toUTC( d );
    struct tm *utc = gmtime( &tmp );

    QCString str;
    str.sprintf("%04d%02d%02d", (utc->tm_year + 1900), utc->tm_mon+1, utc->tm_mday );
    return str;
}

QCString TimeConversion::toISO8601( const QDateTime &dt )
{
    time_t tmp = toUTC( dt );
    struct tm *utc = gmtime( &tmp );

    QCString str;
    str.sprintf("%04d%02d%02dT%02d%02d%02dZ",
        (utc->tm_year + 1900), utc->tm_mon+1, utc->tm_mday,
        utc->tm_hour, utc->tm_min, utc->tm_sec );
    return str;
}

QDateTime TimeConversion::fromISO8601( const QCString &s )
{

#if defined(_OS_WIN32) || defined (Q_OS_WIN32) || defined (Q_OS_WIN64)
    _tzset();
#else
    tzset();
#endif

    struct tm thetime;

    QCString str = s.copy();
    str.replace(QRegExp("-"), "" );
    str.replace(QRegExp(":"), "" );
    str.stripWhiteSpace();
    str = str.lower();

    int i = str.find( "t" );
    QCString date;
    QCString timestr;
    if ( i != -1 ) {
    date = str.left( i );
    timestr = str.mid( i+1 );
    } else {
    date = str;
    }

//     qDebug("--- parsing ISO time---");
    memset( &thetime, 0, sizeof(tm) );
    thetime.tm_year = 100;
    thetime.tm_mon = 0;
    thetime.tm_mday = 0;
    thetime.tm_hour = 0;
    thetime.tm_min = 0;
    thetime.tm_sec = 0;

//     qDebug("date = %s", date.data() );

    switch( date.length() ) {
    case 8:
        thetime.tm_mday = date.right( 2 ).toInt();
    case 6:
        thetime.tm_mon = date.mid( 4, 2 ).toInt() - 1;
    case 4:
        thetime.tm_year = date.left( 4 ).toInt();
        thetime.tm_year -= 1900;
        break;
    default:
        break;
    }

    int tzoff = 0;
    bool inLocalTime = FALSE;
    if ( timestr.find( 'z' ) == (int)timestr.length() - 1 )
    // UTC
    timestr = timestr.left( timestr.length() -1 );
    else {
    int plus = timestr.find( "+" );
    int minus = timestr.find( "-" );
    if ( plus != -1 || minus != -1 ) {
        // have a timezone offset
        plus = (plus != -1) ? plus : minus;
        QCString off = timestr.mid( plus );
        timestr = timestr.left( plus );

        int tzoffhour = 0;
        int tzoffmin = 0;
        switch( off.length() ) {
        case 5:
            tzoffmin = off.mid(3).toInt();
        case 3:
            tzoffhour = off.left(3).toInt();
        default:
            break;
        }
        tzoff = 60*tzoffhour + tzoffmin;
    } else
        inLocalTime = TRUE;
    }

    // get the time:
    switch( timestr.length() ) {
    case 6:
        thetime.tm_sec = timestr.mid( 4 ).toInt();
    case 4:
        thetime.tm_min = timestr.mid( 2, 2 ).toInt();
    case 2:
        thetime.tm_hour = timestr.left( 2 ).toInt();
    default:
        break;
    }

    int tzloc = 0;
    time_t tmp = time( 0 );
    if ( !inLocalTime ) {
    // have to get the offset between gmt and local time
    struct tm *lt = localtime( &tmp );
    tzloc = mktime( lt );
    struct tm *ut = gmtime( &tmp );
    tzloc -= mktime( ut );
    }
//     qDebug("time: %d %d %d, tzloc=%d, tzoff=%d", thetime->tm_hour, thetime->tm_min, thetime->tm_sec,
//         tzloc, tzoff );

    tmp = mktime( &thetime );
    tmp += 60*(-tzloc + tzoff);



    return fromUTC( tmp );
}

This file is part of the documentation for OPIE Version 1.5.5.

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