Storing python dates in sqlite3

is not there any way to store python dates or pyqt4 dates (QDate) in sqlite3 ? I'd not like to use sqlite's date types since i'll need to find the difference between dates that i'll store.That's what i'm trying :

    record = QtCore.QDate.currentDate()
    latest = self.calendar.selectedDate()

    db = sql.connect(":memory:")
    cur = self.db.cursor()
    cur.execute("CREATE TABLE  invoices(record, latest)")
    cur.execute("INSERT INTO invoices VALUES (?, ?)", (record, latest)) 
    db.commit()

That's the error : sqlite3.InterfaceError: Error binding para开发者_JS百科meter 0 - probably unsupported type. Thanks in advance.

No. Convert it to a timestamp first.