Timestamp to time

[anh5kor]

Hello,

I getting a timesatamp from an Hardware and have to convert it in format (sss.zzz) where s is second and z is millsecond.
I tried with the format(h:m:sss.zzz) I am getting the correct data but I don't want minute to display it should be second and millisecond and it should be in 3 digit.
If I have a code

QTime time,time1;
    QString timeString = time.toString();
 
 time.setHMS(0,0,0,0);
time1 = time.addMSecs(Time_ecu2uss[1]);//where Time_ecu2uss[i] contain the timestamp
 timeString = time1.toString("m:ss.zzz");
qDebug()<<timeString ;

QTime time,time1;
    QString timeString = time.toString();

 time.setHMS(0,0,0,0);
time1 = time.addMSecs(Time_ecu2uss[1]);//where Time_ecu2uss[i] contain the timestamp
 timeString = time1.toString("m:ss.zzz");
qDebug()<<timeString ;

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It display the time in 0:00:000 format but I want in 000:000 format

I tired to display like below

QTime time,time1;
    QString timeString = time.toString();
 
 time.setHMS(0,0,0,0);
time1 = time.addMSecs(Time_ecu2uss[1]);//where Time_ecu2uss[i] contain the timestamp
 timeString = time1.toString("sss.zzz");
qDebug()<<timeString ;

QTime time,time1;
    QString timeString = time.toString();

 time.setHMS(0,0,0,0);
time1 = time.addMSecs(Time_ecu2uss[1]);//where Time_ecu2uss[i] contain the timestamp
 timeString = time1.toString("sss.zzz");
qDebug()<<timeString ;

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I am getting the format but wrong time.

[Lesiok]

Something like this :

QTime time = QDateTime::fromTime_t(Time_ecu2uss[1]).time();
QString timeString = time.toString("ss.zzz");

QTime time = QDateTime::fromTime_t(Time_ecu2uss[1]).time();
QString timeString = time.toString("ss.zzz");

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Format string does not know the component sss.

[ChrisW67]

If I read your question correctly then your input is an integer number of milliseconds since some time and you want to display that as seconds to three decimal places

QString result = QString::number(timestamp/1000.0, 6, 'f', 3);
// Or this
QString result = QString("%1.%2").arg(timestamp/1000, 2, 10' '0').arg(timestamp % 1000, 3, 10, '0');

QString result = QString::number(timestamp/1000.0, 6, 'f', 3);
// Or this
QString result = QString("%1.%2").arg(timestamp/1000, 2, 10' '0').arg(timestamp % 1000, 3, 10, '0');

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[anh5kor]

Hello ChrisW67

You are correct about the display. I want seconds to three decimal places.
but when I am using
1.QString result = QString::number(timestamp/1000.0, 6, 'f', 3);
I am getting the error
error: no matching function for call to 'QString::number(double, int, char, int)'
QString result = QString::number(Time_ecu2uss[i]/1000.0, 6, 'f', 3);

and
QString result = QString("%1.%2").arg(timestamp/1000, 2, 10' '0').arg(timestamp % 1000, 3, 10, '0');
Qcompiler is not taking



^

[jefftee]

QString result = QString::number(timestamp/1000.0, 6, 'f', 3);

That should just be:

QString result = QString::number(timestamp/1000.0, 'f', 3);

QString result = QString::number(timestamp/1000.0, 'f', 3);

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[ChrisW67]

The perils of working from memory on a painful virtual keyboard.

Blind copy and paste is not a good way to understand.
The QString::arg() version contains an obvious typo. Fix that and you will be closer.
You may also need to express the last argument to arg() as QLatin1String('0').

[anh5kor]

I have used

QString result = QString("%1.%2").arg(Time_ecu2uss[0]/1000, 2,10,'0').arg(Time_ecu2uss[0] % 1000, 3,10, '0');
qDebug()<<"result"<<result;

QString result = QString("%1.%2").arg(Time_ecu2uss[0]/1000, 2,10,'0').arg(Time_ecu2uss[0] % 1000, 3,10, '0');
qDebug()<<"result"<<result;

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O/p
result "0.00000000000000000000000000000000000000000000000 0.0.0000000000000000000000000000000000000000000000 00"
result "0.00000000000000000000000000000000000000000000000 0.0.0000000000000000000000000000000000000000000000 00"
result "0.00000000000000000000000000000000000000000000000 0.0.0000000000000000000000000000000000000000000000 00"
result "0.00000000000000000000000000000000000000000000000 0.0.0000000000000000000000000000000000000000000000 00
When I Tried

QString result = QString("%1.%2").arg(Time_ecu2uss[0]/1000, 2,1,'0').arg(Time_ecu2uss[0] % 1000, 3,1, '0');
qDebug()<<"result"<<result;

QString result = QString("%1.%2").arg(Time_ecu2uss[0]/1000, 2,1,'0').arg(Time_ecu2uss[0] % 1000, 3,1, '0');
qDebug()<<"result"<<result;

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o/p
result "0.00000000000000000000000000000000000000000000000 0.0.0000000000000000000000000000000000000000000000 00"
result "0.00000000000000000000000000000000000000000000000 0.0.0000000000000000000000000000000000000000000000 00"
result "0.00000000000000000000000000000000000000000000000 0.0.0000000000000000000000000000000000000000000000 00"
result "0.00000000000000000000000000000000000000000000000 0.0.0000000000000000000000000000000000000000000000 00"
result "0.00000000000000000000000000000000000000000000000 0.0.0000000000000000000000000000000000000000000000 00"
And I tried remove the thired argument .

QString result = QString("%1.%2").arg(Time_ecu2uss[0]/1000, 2,'0').arg(Time_ecu2uss[0] % 1000, 3, '0');
qDebug()<<"result"<<result;

QString result = QString("%1.%2").arg(Time_ecu2uss[0]/1000, 2,'0').arg(Time_ecu2uss[0] % 1000, 3, '0');
qDebug()<<"result"<<result;

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o/p
result " 0. 0"
result " 0. 0"
result " 0. 0"
result " 0. 0"
result " 0. 0"

But i am not getting the format as 000.000,I am very new to Qt .

[jefftee]

But i am not getting the format as 000.000,I am very new to Qt .

Are you looking for something like either of the methods below?

int timestamp = 25333; // 25333 milliseconds as an example (25.333 seconds)
 
QString result = QString::number(timestamp/1000.0, 'f', 3);
qDebug("result=%s", qUtf8Printable(result));
 
result = QString("%1").arg(timestamp/1000.0, 0, 'f', 3);
qDebug("result=%s", qUtf8Printable(result));
 
output:
 
result=25.333
result=25.333

int timestamp = 25333; // 25333 milliseconds as an example (25.333 seconds)

QString result = QString::number(timestamp/1000.0, 'f', 3);
qDebug("result=%s", qUtf8Printable(result));

result = QString("%1").arg(timestamp/1000.0, 0, 'f', 3);
qDebug("result=%s", qUtf8Printable(result));

output:

result=25.333
result=25.333

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Both result in the same output and my preference would be the first one that uses QString::number as I personally don't use QString::arg() often.

[anh5kor]

I should get like below.

result = 025.333 sec
result = 060.333 sec
result = 106.333 sec

result = 025.333 sec
result = 060.333 sec
result = 106.333 sec

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[jefftee]

I should get like below.

result = 025.333 sec
result = 060.333 sec
result = 106.333 sec

result = 025.333 sec
result = 060.333 sec
result = 106.333 sec

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Are you sure your seconds will never exceed 999? If you always want 3 digits before, a period, then 3 digits, either of the following works:

int timestamp = 25333; // 25333 milliseconds as an example (25.333 seconds)
 
QString pad = "0000000";
QString result = QString::number(timestamp/1000.0, 'f', 3);
result = pad.left(qMax(pad.length()-result.length(),0)) + result;
qDebug("result=%s", qUtf8Printable(result));
 
result = QString("%1").arg(timestamp/1000.0, 7, 'f', 3, '0');
qDebug("result=%s", qUtf8Printable(result));
 
result.sprintf("%07.3f", timestamp/1000.0);
qDebug("result=%s", qUtf8Printable(result));

int timestamp = 25333; // 25333 milliseconds as an example (25.333 seconds)

QString pad = "0000000";
QString result = QString::number(timestamp/1000.0, 'f', 3);
result = pad.left(qMax(pad.length()-result.length(),0)) + result;
qDebug("result=%s", qUtf8Printable(result));

result = QString("%1").arg(timestamp/1000.0, 7, 'f', 3, '0');
qDebug("result=%s", qUtf8Printable(result));

result.sprintf("%07.3f", timestamp/1000.0);
qDebug("result=%s", qUtf8Printable(result));

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Edit: I prefer the 3rd case this time (sprintf) given your requirement for padding with zeroes if needed...

[anh5kor]

It's working thanks' for the information

[jefftee]

No problem. Did you see my question about being sure that your number of seconds ever exceeds 999?

Are you parsing this output or doing anything else with it that would cause a problem if you exceeded 999,999 milliseconds?

[anh5kor]

No actually I have a fixed time format from
000.000esc
till
119.999sec
and again it will start from 000.000

[jefftee]

Ok, any of the three ways I posted should work for you then... Good luck!