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copy from QStringList to QString

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  • K-StrK K-Str

    Hi SGaist,
    thanks for your answer.
    I tried to use QDAteTime in the following way:

    #include <QCoreApplication>
#include <QDebug>
#include <QString>
#include <QDateTime>

#include <string>

using namespace std;

bool TimeCheck()
{
    QString QS_OldTime = "2020-08-20 09:48:33";
    QString QS_Format = "yyyy-MM-dd hh:mm.ss";
    QDateTime QD_OldTime, QD_AktTime;
    QD_AktTime = QDateTime::currentDateTime();
    QD_OldTime = QDateTime::fromString(QS_OldTime, QS_Format);
    return true;
}


int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
    if (TimeCheck())
    {
        qDebug() << "OK";
    }
    else
    {
        qDebug() << "NOK";
    }
    return a.exec();
}

    This little code should be used to check the difference betweem the aktual time and the old time
    But i'm quiete confused because I do not get the expected results:

    • The values the values for
      actual date and time : QDateTime(2020-08-20 12:19:19.182 CEST Qt::TimeSpec(LocalTime))
      Old date and time : QDateTime( Qt::TimeSpec(LocalTime))

    • How can I get values where I can check easily how the difference is in seconds.

    Whats wrong with the statement

    QD_OldTime = QDateTime::fromString(QS_OldTime, QS_Format);
    J.HilkJ Offline
    J.HilkJ Offline
    J.Hilk
    Moderators
    wrote on last edited by
    #10

    @K-Str
    do you spot the difference in format to actual text?

    09:48:33
    hh:mm.ss

    Be aware of the Qt Code of Conduct, when posting : https://forum.qt.io/topic/113070/qt-code-of-conduct

    Q: What's that?
    A: It's blue light.
    Q: What does it do?
    A: It turns blue.

    1 Reply Last reply
    3
    • K-StrK Offline
      K-StrK Offline
      K-Str
      wrote on last edited by K-Str
      #11

      hi J.Hilk.
      thanks for your answer!
      yes but it would be better to have it in seconds like 900 seconds for 15 minutes.

      J.HilkJ 1 Reply Last reply
      0
      • K-StrK K-Str

        hi J.Hilk.
        thanks for your answer!
        yes but it would be better to have it in seconds like 900 seconds for 15 minutes.

        J.HilkJ Offline
        J.HilkJ Offline
        J.Hilk
        Moderators
        wrote on last edited by
        #12

        @K-Str what do you want in seconds, from what starting point/time

        Be aware of the Qt Code of Conduct, when posting : https://forum.qt.io/topic/113070/qt-code-of-conduct

        Q: What's that?
        A: It's blue light.
        Q: What does it do?
        A: It turns blue.

        1 Reply Last reply
        0
        • K-StrK Offline
          K-StrK Offline
          K-Str
          wrote on last edited by
          #13

          Hi j.Hilk,
          If it is possibel to get something like from time_t mode.

          J.HilkJ 1 Reply Last reply
          0
          • K-StrK K-Str

            Hi j.Hilk,
            If it is possibel to get something like from time_t mode.

            J.HilkJ Offline
            J.HilkJ Offline
            J.Hilk
            Moderators
            wrote on last edited by
            #14

            @K-Str
            https://doc.qt.io/qt-5/qdatetime.html#toSecsSinceEpoch

            Be aware of the Qt Code of Conduct, when posting : https://forum.qt.io/topic/113070/qt-code-of-conduct

            Q: What's that?
            A: It's blue light.
            Q: What does it do?
            A: It turns blue.

            1 Reply Last reply
            1
            • K-StrK Offline
              K-StrK Offline
              K-Str
              wrote on last edited by K-Str
              #15

              J.Hilk,
              thanks a lot for this tip.
              It works perfect.
              But how can I get the milliseconds since a given time like

                  QString QS_OldTime = "2020-08-20 09:48:33";

              This staement

                  QD_OldTime = QDateTime::fromString(QS_OldTime, QS_Format);

              doesn't work correctly

              J.HilkJ 1 Reply Last reply
              0
              • K-StrK K-Str

                J.Hilk,
                thanks a lot for this tip.
                It works perfect.
                But how can I get the milliseconds since a given time like

                    QString QS_OldTime = "2020-08-20 09:48:33";

                This staement

                    QD_OldTime = QDateTime::fromString(QS_OldTime, QS_Format);

                doesn't work correctly

                J.HilkJ Offline
                J.HilkJ Offline
                J.Hilk
                Moderators
                wrote on last edited by
                #16

                @K-Str

                This statement
                QD_OldTime = QDateTime::fromString(QS_OldTime, QS_Format);
                doesn't work correctly

                it doesn't work correctly because your QS_Format is wrong, like I posted previously

                But how can I get the milliseconds since a given

                https://doc.qt.io/qt-5/qdatetime.html#msecsTo

                Be aware of the Qt Code of Conduct, when posting : https://forum.qt.io/topic/113070/qt-code-of-conduct

                Q: What's that?
                A: It's blue light.
                Q: What does it do?
                A: It turns blue.

                1 Reply Last reply
                0
                • K-StrK Offline
                  K-StrK Offline
                  K-Str
                  wrote on last edited by K-Str
                  #17

                  Hi j.Hilk,
                  ok the part

                      QT_Akt=QDateTime::currentMSecsSinceEpoch();

                  works perfect!
                  But what about this part?

                      QString QS_OldTime = "2020-08-15 09:48:33";
    QString QS_Format = "yyyy-MM-dd hh:mm.ss";
    QDateTime QD_OldTime, QD_AktTime;
    QD_OldTime = QDateTime::fromString(QS_OldTime, QS_Format);

                  I saw the value of QD_OldTime is not correctly assigned
                  There was a "." in

                  QString QS_Format = "yyyy-MM-dd hh:mm.ss";

                  on the place ":mm.ss"
                  Now it works perfect.
                  Thanks a lot!

                  JonBJ KroMignonK 2 Replies Last reply
                  0
                  • K-StrK K-Str

                    Hi j.Hilk,
                    ok the part

                        QT_Akt=QDateTime::currentMSecsSinceEpoch();

                    works perfect!
                    But what about this part?

                        QString QS_OldTime = "2020-08-15 09:48:33";
    QString QS_Format = "yyyy-MM-dd hh:mm.ss";
    QDateTime QD_OldTime, QD_AktTime;
    QD_OldTime = QDateTime::fromString(QS_OldTime, QS_Format);

                    I saw the value of QD_OldTime is not correctly assigned
                    There was a "." in

                    QString QS_Format = "yyyy-MM-dd hh:mm.ss";

                    on the place ":mm.ss"
                    Now it works perfect.
                    Thanks a lot!

                    JonBJ Offline
                    JonBJ Offline
                    JonB
                    wrote on last edited by
                    #18

                    @K-Str
                    Just to say: I was the peson who said you should not be using your old C code with memcpy() etc. Your new code with QString, QDateTime looks a lot neater and more C++, well done! :)

                    1 Reply Last reply
                    1
                    • K-StrK K-Str

                      Hi j.Hilk,
                      ok the part

                          QT_Akt=QDateTime::currentMSecsSinceEpoch();

                      works perfect!
                      But what about this part?

                          QString QS_OldTime = "2020-08-15 09:48:33";
    QString QS_Format = "yyyy-MM-dd hh:mm.ss";
    QDateTime QD_OldTime, QD_AktTime;
    QD_OldTime = QDateTime::fromString(QS_OldTime, QS_Format);

                      I saw the value of QD_OldTime is not correctly assigned
                      There was a "." in

                      QString QS_Format = "yyyy-MM-dd hh:mm.ss";

                      on the place ":mm.ss"
                      Now it works perfect.
                      Thanks a lot!

                      KroMignonK Offline
                      KroMignonK Offline
                      KroMignon
                      wrote on last edited by
                      #19

                      @K-Str said in copy from QStringList to QString:

                      But what about this part?
                      QString QS_OldTime = "2020-08-15 09:48:33";
                      QString QS_Format = "yyyy-MM-dd hh:mm.ss";
                      QDateTime QD_OldTime, QD_AktTime;
                      QD_OldTime = QDateTime::fromString(QS_OldTime, QS_Format);

                      This can NOT work because the pattern are not matching.
                      You have to change QS_OldTime or QS_Format.
                      Read carefully and you will see your typo ;)

                      It is an old maxim of mine that when you have excluded the impossible, whatever remains, however improbable, must be the truth. (Sherlock Holmes)

                      1 Reply Last reply
                      1

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