Is there a way i can get the difference between two QDates

shreesh

Hi all,

I am trying to read date from Qstring and I want to extract only month from the date. Can any body tell me how to extract "month" only from the date?

koahnig

You can convert a string with "QDate::fromString":http://qt-project.org/doc/qt-5/qdate.html#fromString and you get the month through "month":http://qt-project.org/doc/qt-5/qdate.html#month

koahnig

You can convert a string with "QDate::fromString":http://qt-project.org/doc/qt-5/qdate.html#fromString and you get the month through "month":http://qt-project.org/doc/qt-5/qdate.html#month

shreesh

Thank you for your effort in answering.
I am trying to put the code as mentioned below, but it throws me an error. Can you please help me in this?

@QString expt = qry->value(2).toString();
QDate extract(QDate::fromString(expt, "MM/dd/yyyy"));
int month = (QDate::month(extract)); //throws error here
ui->lineEdit_expt->setText(month);@

shreesh

Thank you for your effort in answering.
I am trying to put the code as mentioned below, but it throws me an error. Can you please help me in this?

@QString expt = qry->value(2).toString();
QDate extract(QDate::fromString(expt, "MM/dd/yyyy"));
int month = (QDate::month(extract)); //throws error here
ui->lineEdit_expt->setText(month);@

koahnig

@
QString expt = qry->value(2).toString();
QDate extract(QDate::fromString(expt, "MM/dd/yyyy"));
int month = extract.month();
ui->lineEdit_expt->setText(month);
@
That should work, but I have just changed your source and did not compile. So, plesae check.

In addition a friendly recommendation:
Qt is mainly based on C++. It is recommended to have a sound understanding of C++ basics and how to use it. In my opinion you would benefit from working through a "tutorial for C++":http://www.tutorialspoint.com/cplusplus/. There are many other tutorials like this around.

koahnig

@
QString expt = qry->value(2).toString();
QDate extract(QDate::fromString(expt, "MM/dd/yyyy"));
int month = extract.month();
ui->lineEdit_expt->setText(month);
@
That should work, but I have just changed your source and did not compile. So, plesae check.

In addition a friendly recommendation:
Qt is mainly based on C++. It is recommended to have a sound understanding of C++ basics and how to use it. In my opinion you would benefit from working through a "tutorial for C++":http://www.tutorialspoint.com/cplusplus/. There are many other tutorials like this around.

shreesh

Thank you, it worked.
I appreciate your suggestion.

shreesh

Thank you, it worked.
I appreciate your suggestion.

shreesh

I an application I am using the extracted month from Qdate and then to match it with "month" specified in a combobox. There are multiple database entries for a month, but in the output "tableview" only the last matching row is displaying. Below is the code I wrote.
Can somebody tell me if there is any mistake in the logic?

@QString filter_month = ui->comboBox_month->currentText();
QString filter_year = ui->comboBox_year->currentText();

conn.connopen();
QSqlQuery * qry = new QSqlQuery();

qry->prepare("select class_date from schedule_class");

if(qry->exec&#40;&#41;&#41;
{


    while(qry->next(&#41;)
    {
        QString expt = qry->value(0).toString();

        QSqlQueryModel * modal = new QSqlQueryModel();

        QDate extract(QDate::fromString(expt, "MM/dd/yyyy"));

        int m = extract.month();
        QString month = QString::number(m);

        int y = extract.year();
        QString year = QString::number(y);

      if(month == filter_month and year == filter_year)
      {
      QSqlQuery * qry2 = new QSqlQuery();
      qry2->prepare("select * from schedule_class where class_date='"+expt+"'");
      qry2->exec&#40;&#41;;

      modal->setQuery(* qry2);

      }
    ui->tableView_classes->setModel(modal);
    }
    conn.connclose();
}

@

shreesh

I an application I am using the extracted month from Qdate and then to match it with "month" specified in a combobox. There are multiple database entries for a month, but in the output "tableview" only the last matching row is displaying. Below is the code I wrote.
Can somebody tell me if there is any mistake in the logic?

@QString filter_month = ui->comboBox_month->currentText();
QString filter_year = ui->comboBox_year->currentText();

conn.connopen();
QSqlQuery * qry = new QSqlQuery();

qry->prepare("select class_date from schedule_class");

if(qry->exec&#40;&#41;&#41;
{


    while(qry->next(&#41;)
    {
        QString expt = qry->value(0).toString();

        QSqlQueryModel * modal = new QSqlQueryModel();

        QDate extract(QDate::fromString(expt, "MM/dd/yyyy"));

        int m = extract.month();
        QString month = QString::number(m);

        int y = extract.year();
        QString year = QString::number(y);

      if(month == filter_month and year == filter_year)
      {
      QSqlQuery * qry2 = new QSqlQuery();
      qry2->prepare("select * from schedule_class where class_date='"+expt+"'");
      qry2->exec&#40;&#41;;

      modal->setQuery(* qry2);

      }
    ui->tableView_classes->setModel(modal);
    }
    conn.connclose();
}

@

koahnig

You should place a new topic.
Go into a forum "eg Generanl and Desktop.":http://qt-project.org/forums/viewforum/10/ and press "Start new discussion"
Choose describing a bit your problem. This will probably better attract readers for helping. "There are also the forum rules available":http://qt-project.org/wiki/ForumHelp

koahnig

You should place a new topic.
Go into a forum "eg Generanl and Desktop.":http://qt-project.org/forums/viewforum/10/ and press "Start new discussion"
Choose describing a bit your problem. This will probably better attract readers for helping. "There are also the forum rules available":http://qt-project.org/wiki/ForumHelp

Nithya Somasundaram

QDate cdat=QDate::currentDate();
QString cur=QVariant(cdat.toJulianDay()).toString();
QString exp=QVariant(QVariant(expdtcal).toDate().toJulianDay()).toString();
int diff=QVariant(exp).toInt()-QVariant(cur).toInt();
if((QVariant(expdtcal).toDate()).toJulianDay() - cdat.toJulianDay() <= 0)
{
//Don't add medicine
qDebug()<<"Expired";
}