PYQT5如何按日期"mon“、"tues”等打开新窗口

from PyQt5.QtWidgets import QApplication, QMainWindow, QPushButton
from PyQt5.QtCore import QDate

class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("Main Window")
        self.setGeometry(100, 100, 300, 200)

    def open_new_window(self, day):
        new_window = QMainWindow()
        new_window.setWindowTitle(day + " Window")
        new_window.setGeometry(200, 200, 300, 200)
        new_window.show()

app = QApplication([])
main_window = MainWindow()

mon_button = QPushButton("Mon", main_window)
mon_button.clicked.connect(lambda: main_window.open_new_window("Mon"))

tues_button = QPushButton("Tues", main_window)
tues_button.clicked.connect(lambda: main_window.open_new_window("Tues"))

main_window.show()
app.exec_()