// get ms between UTC dates and make into "difference" datevar nMonths = dt2.getUTCMonth() - dt1.getUTCMonth() + (nYears!which watches rollover not completion
// these are in absolute terms, ie totals of u
我有一个数据帧,其中包含一个列'trade_dt‘,如下所示2009/12/22009/12/4benchmark['trade_dt']= pd.to_datetime(benchmark['trade_dt'], format='%Y-&m-%d')
ValueError: time data '2009/12/1