def _str2datetime(s):
    return datetime.strptime( s,'%Y%m%d')
:type start_relative: tuple
dataset/ETHPy150Open cmorgan/trading-with-python/lib/interactivebrokers.py/_str2datetime--crossover with--dataset/ETHPy150Open pcn/pyKairosDB/pyKairosDB/reader.py/_query_relative