return values of `start_time` and `end_time`
benoit need for start / end time:
datetime.datetime.timestamp(datetime.datetime.strptime(Start_time,"%Y-%m-%dT%H:%M:%S.%f%z"))
datetime.datetime.timestamp(datetime.datetime.strptime(End_time,"%Y-%m-%dT%H:%M:%S.%f%z"))