python-dateing-4.py

import datetime
import pytz

timestamp = 1556668800.0
date = datetime.datetime.utcfromtimestamp(timestamp)
print(date) # 2019-05-01 00:00:00

# Applying timezone without converting it
date_utc = pytz.utc.localize(date)
print(date_utc.strftime(fmt)) # 2019-05-01 00:00:00 UTC+0000

# Then converting it to UTC
date_sp = date_utc.astimezone(tz=pytz.timezone("America/Sao_Paulo"))
print(date_sp.strftime(fmt)) # 2019-04-30 21:00:00 -03-0300