#NEWLINE# def as_of( self , dt ) : #NEWLINE# #INDENT# ' Get the future chain for this root symbol as of a specific date.\n\n        Parameters\n        ----------\n        dt : datetime.datetime or pandas.Timestamp or str, optional\n            The as_of_date for the new chain.\n\n        Returns\n        -------\n        FutureChain\n\n        ' #NEWLINE# return FutureChain ( asset_finder = self . _asset_finder , get_datetime = self . _algorithm_get_datetime , root_symbol = dt . root_symbol , as_of_date = Timestamp ( dt , tz = 'UTC' ) )