def year_lookup_bounds(self, value):
        first = '%s-01-01 00:00:00'
        second = '%s-12-31 23:59:59.999999'
        return [first % value, second % value]
Returns the lower triangular portion of this matrix.
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.4/django/db/backends/__init__.py/BaseDatabaseOperations.year_lookup_bounds--crossover with--dataset/ETHPy150Open jimmycallin/pydsm/pydsm/indexmatrix.py/IndexMatrix.triangular_lower