get_kline function isn't returning specified dates/times

import datetime
import time

t_start = datetime.datetime(2021, 1, 1)
t_start = time.mktime(t_start.timetuple())

t_stop = datetime.datetime(2021, 2, 1)
t_stop = time.mktime(t_start.timetuple())

data = marketclient.get_kline('REQ-BTC', '1min', startAt=t_start, endAt=t_stop)

all returned data is the present day - 1500 pieces of data, whether that be 1min or 1day etc...