TPOT regression with separate test and train dataset

Hi, I'm trying out tpot for time series problem and i have two separate dataset, one for training and one for testing. While using normal train test split it gives you x_train, y_train, x_test, y_test. In this case im having separate dataset. Since i'm new to machine learning i'm confused then what are the parameters i need to pass for fit function , normally x_train and y_train is passed. In my case what should i pass? If someone could help me perform the timeseries it would be very helpful. My dataset contains 14 columns , one is the date and time and other is output variable and the related features.

_Originally posted by @sonuthomas1996 in https://github.com/EpistasisLab/tpot/issues/345#issuecomment-468139420_