def get_db_prep_value(self, value, connection, prepared=False):
        """
        Further conversion of Python value to database value for QUERYING.
        This follows ``get_prep_value()``, and is for backend-specific stuff.
        See notes above.
        """
        log.debug("get_db_prep_value: {}, {}", value, type(value))
        value = super().get_db_prep_value(value, connection, prepared)
        if value is None:
            return value
        # log.debug("connection.settings_dict['ENGINE']: {}",
        #           connection.settings_dict['ENGINE'])
        if connection.settings_dict['ENGINE'] == 'django.db.backends.sqlite3':
            return python_utc_datetime_to_sqlite_strftime_string(value)
        return value