[python] utc timestamp to iso8601(ignore daylight time)

TIME_ZONE_OFFSET = -4
def
transform_utc_timestamp_to_date_str(dt_timestamp: int) -> str:
utc_time = dt.datetime.utcfromtimestamp(dt_timestamp)
proj_time = utc_time + dt.timedelta(hours=TIME_ZONE_OFFSET)

fill_len = 2
if TIME_ZONE_OFFSET < 0:
fill_len = 3

return proj_time.strftime('%Y-%m-%dT%H:%M:%S') + f'Z{str(TIME_ZONE_OFFSET).zfill(fill_len)}:00'