from datetime import datetime
import pytz
dt = datetime.strptime("01/01/2018 13:00:40", "%d/%m/%Y %H:%M:%S")
# setar o timezone (sem conversão)
dt = pytz.timezone('America/Sao_Paulo').localize(dt)
# converter para UTC
dt = dt.astimezone(pytz.utc)
print(dt.strftime("%Y-%m-%dT%H:%M:%S%Z").replace('UTC', 'Z'))
ZnJvbSBkYXRldGltZSBpbXBvcnQgZGF0ZXRpbWUKaW1wb3J0IHB5dHoKCmR0ID0gZGF0ZXRpbWUuc3RycHRpbWUoIjAxLzAxLzIwMTggMTM6MDA6NDAiLCAiJWQvJW0vJVkgJUg6JU06JVMiKQojIHNldGFyIG8gdGltZXpvbmUgKHNlbSBjb252ZXJzw6NvKQpkdCA9IHB5dHoudGltZXpvbmUoJ0FtZXJpY2EvU2FvX1BhdWxvJykubG9jYWxpemUoZHQpCiMgY29udmVydGVyIHBhcmEgVVRDCmR0ID0gZHQuYXN0aW1lem9uZShweXR6LnV0YykKcHJpbnQoZHQuc3RyZnRpbWUoIiVZLSVtLSVkVCVIOiVNOiVTJVoiKS5yZXBsYWNlKCdVVEMnLCAnWicpKQo=