For some reason scenarios 3 & 4 got butchered.
3) Unfamiliar user (pure Numpy):
dates = np.asarray(dates, dtype='<M8[M]')
months_less_one = dates.astype(np.int64) % 12
diff_months = (months_less_one - months_less_one // 3 * 3).astype('<M8[M]')
dates -= diff_months
=> Works, but ugly...
4) Advanced user:
dates = np.asarray(dates, dtype='<M8[M]')
=> Really, so easy...
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