'Year:Day_of_year format'

def test_yday_format(self):

    times = ['2000-12-01', '2001-12-01    01:01:01.123']
    t = Time(times, format='iso', scale='tai')
    t.out_subfmt = 'date_hm'
    assert np.all((t.yday == np.array(['2000:336:00:00', '2001:335:01:01'])))
    t.out_subfmt = '*'
    assert np.all((t.yday == np.array(['2000:336:00:00:00.000', '2001:335:01:01:01.123'])))
