#client
    def changetime(self):
        msg = 'ChangeTime'
        client.send(bytes(msg, "utf-8"))
        sleep(0,1)
        ID=self.ui.lineEdit.text()
        Date=self.ui.lineEdit_2.text()
        Time=self.ui.lineEdit_3.text()
        client.send(bytes(ID, "utf-8"))
        client.send(bytes(Time, "utf-8"))
        client.send(bytes(Date, "utf-8"))

        data = client.recv(BUFSIZ)
        data = data.decode("utf-8")
        if data == "Change Time Failed!":
            print(msg)
            #do sth
        elif data == "Change Time Successfully!":
            print (msg)
            #do sth