Difference between two QDateTime in milliseconds.

srikanth

my ITime.cpp file


#include "ITime.h"


ITime::ITime()
{
    
}

ITime::~ITime()
{
	
}

void ITime::start()
{	
   oStartTime = QDateTime::currentDateTime();
   
}


quint64 ITime::elapsed()
{
	
	QDateTime otime = oStartTime;
	QString str = otime.toString();
	oEndTime = QDateTime::currentDateTime();
quint64 elapsed = 0;
elapsed = (oEndTime.secsTo(otime));
QString str1 = QString::number(elapsed);
elapsed = (elapsed * 1000);


return elapsed;
}

my main.cpp file contains

#include "ITime.h"

int main()
{

ITime time;
time.start();
 qDebug() << "current date" << time.oStartTime ;
time.elapsed();
qDebug() << "old date" << time.oEndTime ;

qDebug() << "differnce time" << time.elapsed() ;

}

my ITime.h file contains

#ifndef ITime_H
#define ITime_H
#include <QDateTime>
#include <QDebug> 
#include <iostream>


class ITime 
{
public:
	ITime();
	~ITime();
	void start();
	quint64 elapsed();


public:

	int nTimeDiff;
	QDateTime oStartTime;
	QDateTime oEndTime;
	

};
#endif // ITime_H

here am trying to get the difference between two DateTime intervals but the difference between two time in not getting correct output

problem is getting here

quint64 elapsed = 0;
elapsed = (oEndTime.secsTo(otime));
QString str1 = QString::number(elapsed);
elapsed = (elapsed * 1000);

am struck here please help me to get out of this

Chris Kawa

You're kinda re-inventing the wheel. There's QElapsedTimer for this case.

Sagar Ojha

I need the same in minuts.

Chris Kawa

@Sagar-Ojha Well... I hope you know how to "convert" milliseconds to minutes ;)

Sagar Ojha

@Chris-Kawa obviously

srikanth

i want the difference between two DateTime in milliseconds

for that

QDateTime oStartTime = QDateTime::currentDateTime(); 
\\\ 30 milliseconds difference.	
QDateTime oEndtTime = QDateTime::currentDateTime();

now am trying like this to get difference in milliseconds

quint64 difference= (oStartTime.secsTo(oEndtTime )*1000);

the result is "0" because here we are converting into second's so am not getting exact output to get difference in milliseconds

am using another method

quint64 difference= (oStartTime.time().msecsTo(oEndtTime .time()));

here am getting exact time difference in milliseconds but if we change the date for oEndtTime the the difference of days are not coming , because time() is limited to 24 hours only , if i want to get DateTime difference in more than 1 day then time() is not useful , please help me to get out of this

am struck here to convert DateTime difference in milliseconds .

VRonin


quint64 difference = qAbs(oStartTime.date().daysTo(oEndtTime .date()));
difference  *= static_cast<quint64>(24); // days to hours
difference  *= static_cast<quint64>(60); // hours to minutes
difference  *= static_cast<quint64>(60); // minutes to seconds
difference  *= static_cast<quint64>(1000); // seconds to milliseconds
difference += qAbs(oStartTime.time().msecsTo(oEndtTime .time()));