If you need this for just measuring the performance of your application, maybe you should use the QML Profiler instead http://doc.qt.io/qtcreator/creator-qml-performance-monitor.html

@ekkescorner Thank you.

Hi,

How is that related to Qt ?

@jsulm

QDateTime::currentDateTime is SystemTime

@mrjj
sorry, okay im now goign to SOLVED this thread thanks @SGaist @mrjj

I'd say: benchmark it, so you'll know how much time it takes to do the match. Don't forget to load several dictionaries to match real-life setup

I would suggest taking a look at QElapsedTimer. This class allows you to start a "count up" timer.

One of the methods of the class is elapsed() which returns the number of milliseconds since the timer was started.

By knowing how long you want to allow (total time perhaps) and using an elapsed timer with elapsed() the difference between the two will be the remaining time, in milliseconds.

To convert it to a nice human readable form there are lots of ways but you could simply code up (not the prettiest code, downloaded from a stack overflow post):

QString ConvertMStoHumanTime( qint64 ms, bool showDays, bool showMS ) { QString Result; double interval; qint64 intval; // Days interval = 24.0 * 60.0 * 60.0 * 1000.0; intval = (qint64)trunc((double)ms / interval); if( intval<0 ) intval = 0; ms -= (qint64)trunc(intval * interval); qint32 days = intval; // Hours interval = 60.0 * 60.0 * 1000.0; intval = (qint64)trunc((double)ms / interval); if( intval<0 ) intval = 0; ms -= (qint64)trunc(intval * interval); qint32 hours = intval; // Minutes interval = 60.0 * 1000.0; intval = (qint64)trunc((double)ms / interval); if( intval<0 ) intval = 0; ms -= (qint64)trunc(intval * interval); qint32 minutes = intval; // Seconds interval = 1000.0; intval = (qint64)trunc((double)ms / interval); if( intval<0 ) intval = 0; ms -= (qint64)trunc(intval * interval); qint32 seconds = intval; // Whatever is left over is milliseconds char buffer[25]; memset( buffer, 0, 25 ); if( showDays ) { if( days<10 ) sprintf_s( buffer, "%d", days ); Result.append( QString("%1d ").arg(buffer) ); } if( hours<10 ) sprintf_s( buffer, "0%d", hours ); else sprintf_s( buffer, "%d", hours ); Result.append( QString("%1:").arg(buffer) ); if( minutes<10 ) sprintf_s( buffer, "0%d", minutes ); else sprintf_s( buffer, "%d", minutes ); Result.append( QString("%1:").arg(buffer) ); if( seconds<10 ) sprintf_s( buffer, "0%d", seconds ); else sprintf_s( buffer, "%d", seconds ); Result.append( QString("%1").arg(buffer) ); if( showMS ) { if( ms<10 ) sprintf_s( buffer, "00%d", ms ); else if( ms<100 ) sprintf_s( buffer, "0%d", ms ); else sprintf_s( buffer, "%d", ms ); Result.append( QString(".%1").arg(buffer) ); } return Result; }