Leading zeroes for time with QString

BKBK

The goal is to format time to display in a QLineEdit and using QString. Hours, minutes, and seconds look much better when 2 hours 3 minutes is displayed as 02:03. Here is my best shot so far:

Time_hms = QString( “%1  %2:%3:%4” ) .arg( days,3)  
                                     .arg( hours:2 ) 
                                     .arg( minutes:2 ) 
                                     .arg( seconds );

So far QString does not honor the field width. What needs to be changed?

aha_1980

@BKBK

You should try this overload.

Time_hms = QString( “%1  %2:%3:%4” ) .arg( days,3)  
                                     .arg( hours, 2, 10, QChar('0')) 
                                     .arg( minutes, 2, 10, QChar('0')) 
                                     .arg( seconds, 2, 10, QChar('0'));

If your date is in a QDate, you can use the toString() function, which allows easy formatting too.

Regards

mrjj

Hi

   auto days = 33;
    auto hours = 2;
    auto minutes = 2;
    auto seconds = 14;
    auto Time_hms = QString( "%1 %2:%3:%4" ).arg( days, 3, 10, QChar('0'))
                    .arg( hours, 2, 10, QChar('0') )
                    .arg( minutes, 2, 10, QChar('0') )
                    .arg( seconds,2,10, QChar('0') );
    qDebug() << Time_hms;

output
033 02:02:14

Hehe. double post in exact moment :)

BKBK

@mrjj Yeah, double post right on the money.

We are stuck with Qt version 3 and I suspect that matters. Simplifying to a single field, this almost works

*time_hms = QString( “x$1y” ) .arg( hours, 2, 10 );

Producing: x 6y There is a space rather than the character zero.
Add in a bit more

*time_hms = QString( “x$1y” ) .arg( hours, 2, 10, QChar(‘0’) );

To produce: x6.0000
Actually there are about 48 zeroes after the 6. The decimal point was not present in the first shortened example.
Edit: So I got tired of muckin around and wrote this concept four times

if( hours < 10 ) qhours = QString( “0%1:” ) .arg( hours );
else                         qhours =  QString( “%1:” ) .arg( hours );

Then combined the strings to make the final. That’s ugly but now I get to move on.
If there is a better solution I will use it.
Thanks the taking the time to reply.

mrjj

Hi
So in Qt3 (wow!) the
..2, 10, QChar(‘0’) ); part doesn't really do the same?
What types are hours, minutes etc ?

J.Hilk

@BKBK
Qt 3 should have QDateTime right ?

does this work:

    int year(2018),months(1),days(29),hours(8),minutes(22),seconds(0);

    QDateTime dateTime(QDate(year,months,days), QTime(hours,minutes,seconds));

    QString dateTimeString = dateTime.toString(QString("ddd hh:mm:ss"));
    qDebug () << dateTimeString;

BKBK

@J.Hilk
In the example code I provided hours, minutes, etc, are all integers. Time in nanoseconds is fetched and the values extracted.
This version does not have QtDateTime but does have QTime. I noticed that the underlying format is not explicitly stated.
This is a strip chart function and most, probably all, the parameters to be charted arrive with a time stamp as a double. That time may be in millisecond, micros, or nanos so I wrote the basic code to work with any. Simple switch statement. Formatting was easy once each part was handled separately. Just a bit ugly 'cause there are four sets of if statements. Then just concat them:
qtime = qdays + qhours + qmin + qseconds
I am going to leave that code in place for now. This time I'll remember to mark the thread as resolved.
Thanks again for your time.