def METHOD_NAME(self):
    """Accessing delta_ut1_utc should try to get it from IERS
    (closes #1924 partially)"""
    with iers_conf.set_temp("auto_download", False):
        t = Time("2012-06-30 12:00:00", scale="utc")
        assert not hasattr(t, "_delta_ut1_utc")
        # accessing delta_ut1_utc calculates it
        assert allclose_sec(t.delta_ut1_utc, -0.58682110003124965)
        # and keeps it around
        assert allclose_sec(t._delta_ut1_utc, -0.58682110003124965)