A Stopwatch in qt GUI ?

[020394]

Hello all ,
I am trying to make a stopwatch for my GUI when i click the start button
I been Researching and tried out alot of examples in the internet.I tried to minus the the current time (InfusionTime)minus the time(CurrentTime) i click on the button by using.

void Infusion::GetDuration()
{
int x;
   x=InfusionTime.secsTo(CurrentTime);
}

void Infusion::GetDuration()
{
int x;
   x=InfusionTime.secsTo(CurrentTime);
}

To copy to clipboard, switch view to plain text mode 

i also include

QTimer *duration= new QTimer(this);
      connect(duration, SIGNAL(timeout()),this, SLOT(GetDuration()));
      Stopwatch.start();   //QTime Stopwatch; in header file
      duration->start(50);

QTimer *duration= new QTimer(this);
      connect(duration, SIGNAL(timeout()),this, SLOT(GetDuration()));
      Stopwatch.start();   //QTime Stopwatch; in header file
      duration->start(50);

To copy to clipboard, switch view to plain text mode 

to check for the number everytime.
But I think i am doing it wrong as whenever i click the button . I keep getting the current time which is not moving(eg. Time Stamp)


Can anyone help me ? Or maybe teach me another way to implement a stopwatch in my gui.
Thanks