def multi_intersect(input):
    arr  = input[0].ravel()
    for this in input[1:]:
        arr = np.intersect1d(arr, this.ravel())

    return arr
Calculate how many days the month spans.
dataset/ETHPy150Open nipy/nitime/nitime/utils.py/multi_intersect--crossover with--dataset/ETHPy150Open shymonk/django-datatable/table/columns/calendarcolumn.py/InlineMonthsColumn.get_days_span