>>> import datetime

>>> datetime.datetime.now()

datetime.datetime(2020, 5, 20, 23, 23, 31, 57908)

>>> cur_time = datetime.datetime.now()

>>> cur_time.strftime('%Y-%m-%d')

'2020-05-20'

>>> cur_time+datetime.timedelta(days=20)

datetime.datetime(2020, 6, 9, 23, 24, 16, 160627)

>>> future_time = cur_time+datetime.timedelta(days=20)

>>> future_time.strftime('%Y-%m-%d')

'2020-06-09'