I am having trouble setting the date properly. Basically I have timestamp, open, close, high, low, volume stored line by line in a text file (downloaded using Yahoo API). My program then reads each line and converts it to a QStringList. It then puts each item in the list into the appropriate QVector<double> (dates[], open[], close[], high[], low[], volume[]) converting each item to a double. Here is where the problem is. It appears that the precision is lost during the conversion. The dates always show as periods back in 1970 when the actually timestamp is in fact a date from a few days ago.

Qt Code: 
  1. #include "dialog.h"
  2. #include "ui_dialog.h"
  3. #include<QFile>
  4. #include<QTextStream>
  5. #include<string>
  6. #include<iostream>
  7. using namespace std;
  8.  
  9. Dialog::Dialog(QWidget *parent) :
  10.     QDialog(parent),
  11.     ui(new Ui::Dialog)
  12. {
  13.     ui->setupUi(this);
  14.     QStringList lines;
  15.     QString line;
  16.  
  17.     QVector<double> dates;
  18.     QVector<double> high;
  19.     QVector<double> low;
  20.     QVector<double> open;
  21.     QVector<double> close;
  22.     QVector<double> volume;
  23.  
  24.     QFile file ("YHOO.cvs");
  25.     if(file.open(QIODevice::ReadOnly))
  26.     {
  27.  
  28.  
  29.         QTextStream in(&file);
  30.         while (!in.atEnd())
  31.         {
  32.  
  33.             line = in.readLine();
  34.             lines = line.split(",");
  35.             dates.append(lines[0].toDouble());
  36.             close.append(lines[1].toDouble());
  37.             high.append(lines[2].toDouble());
  38.             low.append(lines[3].toDouble());
  39.             open.append(lines[4].toDouble());
  40.             volume.append(lines[5].toInt());
  41.         }
  42.         file.close();
  43.     }
  44.     else{
  45.  
  46.         QMessageBox::information(0,"info",file.errorString());
  47.     }
  48.  
  49.  
  50.     ui->plot->addGraph();
  51.  
  52.     ui->plot->graph(0)->setData(dates, high);
  53.  
  54.  
  55.     ui->plot->xAxis->setTickLabelType(QCPAxis::ltDateTime);
  56.     ui->plot->xAxis->setDateTimeFormat("MM/dd/yyyy");
  57.  
  58.     QPen pen;
  59.     pen.setColor(QColor(200,200,200));
  60.  
  61.     ui->plot->graph(0)->setPen(pen);
  62.     ui->plot->graph(0)->setLineStyle(QCPGraph::lsLine);
  63.     ui->plot->graph(0)->setBrush(QBrush(QColor(160,50,150)));
  64.  
  65.     ui->plot->xAxis->setRange(dates[0], dates[dates.length()-1]);
  66.     ui->plot->yAxis->setRange(*std::min_element(high.begin(), high.end()),*std::max_element(high.begin(),high.end()));
  67.  
  68. }
  69.  
  70. Dialog::~Dialog()
  71. {
  72.     delete ui;
  73. }
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YHOO.cvs

Qt Code: 
  1. 20140227,30.1000,30.1600,28.4100,29.7000,2351300
  2. 20140228,28.3000,32.0000,27.0000,29.2000,3781000
  3. 20140303,28.1900,28.9100,26.8900,27.3000,1664900
  4. 20140304,30.0400,30.3800,28.6300,28.8500,2341700
  5. 20140305,28.5500,29.5000,28.4900,29.2400,7314100
  6. 20140306,27.1700,29.0100,27.1500,28.7600,3007300
  7. 20140307,27.2000,28.3200,26.7100,27.8400,2961800
  8. 20140310,28.2400,28.5000,27.3500,27.7200,1622100
  9. 20140311,27.5300,28.7400,27.1800,28.4400,1745200
  10. 20140312,28.5400,28.7400,27.3500,27.4700,2206300
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