def exportValue(self, vf, value):
        m = StrStrHashMap(value)
        keysAndValues = []
        for i in m.keys():
            keysAndValues.append(i)
            keysAndValues.append(m[i])
def start_date(self):
        """ Returns a date object of the todo's start date. """
        return self.get_date(config().tag_start())