Qt::QCalendarWidget(日历)

calendar = new QCalendarWidget;
calendar->setMinimumDate(QDate(1900, 1, 1));
calendar->setMaximumDate(QDate(3000, 1, 1));

QTextCharFormat format;
format.setFontWeight(QFont::Bold);
format.setFontItalic(true);
format.setForeground(Qt::green);

calendar->setHeaderTextFormat(format);