Just posting a correction to the parent post, putting the year as the
first parameter to datetime.datetime():

def byYear(column, year):
    return AND(column >= datetime.datetime(year, 1, 1),
               column < datetime.datetime(year + 1, 1, 1))

def byYearAndMonth(column, year, month):
    return AND(column >= datetime.datetime(year, month, 1),
               column < datetime.datetime(year + (month + 1) / 13,
                                     month % 13 + 1, 1))

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