>>> from dates import compara_dates

>>> c = compara_dates(10, 4, 1917, 8, 2, 1923)
>>> c
-1
>>> c = compara_dates(10, 4, 1917, 8, 4, 1917)
>>> c
1
>>> c = compara_dates(10, 4, 1917, 10, 4, 1917)
>>> c
0