date_addition_subtraction.py

"""
code snippet to add/subtract datetime object

https://github.com/ahmedshahriar
"""
from datetime import datetime, timedelta

# addition
d = datetime.now() + timedelta(days=1, weeks=1, hours=19,seconds=1,milliseconds=1,microseconds=1)

#subtraction
d = datetime.now() - timedelta(days=1, weeks=1, hours=19,seconds=1,milliseconds=1,microseconds=1)

d.strftime('%Y-%m-%d %H:%M:%S')

# output sample 
# 2020-12-05 12:05:36