天天向上

Qt Creator新增一個專案<Qt圖形介面應用程式>

專案名稱: DateTimeGUI

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開始利用QDate和QTime來進行日期時間的操作吧!
首先mainwindow.h加入下列標頭檔
#include <QDate>
#include <QTime>
#pragmaexecution_character_set("utf-8")

mainwindow.ui

加入pushbutton和label如下

利用notepad++工具開啟mainwindow.cpp, 選擇<編碼>設定為編譯成UTF-8碼

加入click事件

加入程式碼

void MainWindow::on_pushButton_clicked()
{
    QDate dt(2013, 10, 30);
    QString str = "今天是 ";
    ui->label->setText(str + dt.toString());
}

執行測試, 按下<日期>按鈕

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仿照上面複製一份pushbutton, 其text屬性值=setDate

setDate

void MainWindow::on_pushButton_2_clicked()
{
    QDate dt;
    dt.setDate(2013,10,30);
    QString str = "今天是 ";
    ui->label->setText(str + dt.toString());
}

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void MainWindow::on_pushButton_3_clicked()
{
    QTime tm(11, 16, 30, 55);
    QString str = "hh:mm:ss.zzz: ";
    ui->label->setText(str + tm.toString("hh:mm:ss.zzz"));
}

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setHMS

void MainWindow::on_pushButton_4_clicked()
{
    QTime tm;
    tm.setHMS(11, 24, 59, 333);
    QString str = "hh:mm:ss.zzz: ";
    ui->label->setText(str + tm.toString("hh:mm:ss.zzz"));
}

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抓取目前日期 & 時間 
void MainWindow::on_pushButton_5_clicked()
{
    QDate dt_now = QDate::currentDate();
    QTime tm_now = QTime::currentTime();
    ui->label->setText(dt_now.toString("yyyy/MM/dd ") + " " + tm_now.toString("hh:mm:ss.zzz"));
}

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日期比較
void MainWindow::on_pushButton_6_clicked()
{
    QDate dt1(2013,10,30);
    QDate dt2(2012,10,30);
    if(dt1>dt2)
        ui->label->setText(dt1.toString() + " > " + dt2.toString() );
    else
        ui->label->setText(dt1.toString() + " < " + dt2.toString() );
}

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leap year(閏年)
void MainWindow::on_pushButton_7_clicked()
{
    bool isLeapYear = QDate::isLeapYear(2013);
    if(isLeapYear)
        ui->label->setText( "2013是閏年" );
    else
        ui->label->setText( "2013不是閏年" );
}

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Custom date formats

Custom time formats

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Retrieving the weekday

今天是這個禮拜的第幾天

void MainWindow::on_pushButton_8_clicked()
{
    QDate dt = QDate::currentDate();
    int dayOfWeek = dt.dayOfWeek();
    ui->label->setText( dt.toString() + " dayOfWeek = " + QString::number( dayOfWeek ) );
}

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Number of days

計算這個月的天數

void MainWindow::on_pushButton_9_clicked()
{
    QDate dt = QDate::currentDate();
    int numOfDays = dt.daysInMonth();
    ui->label->setText( dt.toString() + " numOfDays = " + QString::number( numOfDays ) );
}

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Checking validity of a date

檢查日期
void MainWindow::on_pushButton_10_clicked()
{
    QDate dt(2013,10,32);
    int isValidDate = dt.isValid();
    ui->label->setText( dt.toString() + " isValid = " + QString::number( isValidDate ) );
}

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Days to, days from

計算幾天後的日期, 計算幾天前的日期

void MainWindow::on_pushButton_11_clicked()
{
    QDate dt = QDate::currentDate();
    int addDates = 3;                    // 三天後
    QDate dt_after = dt.addDays(addDates);
    ui->label->setText( dt.toString() + " " + QString::number(addDates) + " 天後為 " + dt_after.toString() );
}

void MainWindow::on_pushButton_12_clicked()
{
    QDate dt = QDate::currentDate();
    int addDates = -3;                    // 三天前
    QDate dt_after = dt.addDays(addDates);
    ui->label->setText( dt.toString() + " " + QString::number(addDates) + " 天前為 " + dt_after.toString() );
}

參考資料: http://www.zetcode.com/gui/qt4/datetime/

範例程式(sample code): DateTimeGUI