[Python] datetime.timedelta usage module

timedelta implemented using modules python datetime Date Time adding:

python calculate tomorrow's date:

from datetime import datetime
from datetime import timedelta

now = datetime.now()
aDay = timedelta(days=1)
now = now + aDay
print(now.strftime('%Y-%m-%d'))

python computing time yesterday:

from datetime import datetime
from datetime import timedelta

now = datetime.now()
aDay = timedelta(days=-1)
now = now + aDay
print(now.strftime('%Y-%m-%d'))

Use timedelta can easily do on a date day days, hours hour, minutes, seconds, milliseconds, subtle calculation of time, if you need another month to calculate approach

Last month, the calculation of the month

import time

last_month = time.localtime()[1]-1 or 12 #减去几就是上几个月
print(last_month)