data_copy["ts"] = data_copy["effective_to_date"].astype("int64")/1e9 data_copy["ts"].iloc[1] # the division exclude milliseconds bringing it down to seconds
data_copy["ts"] = data_copy["effective_to_date"].astype("int64")/1e9 data_copy["ts"].iloc[1] # the division exclude milliseconds bringing it down to seconds