python的datetime

import os
from datetime import date
from datetime import datetime
from datetime import timedelta

print(date.today())
print(datetime.now())

如何计算三天前的时间和三天后的时间

d = date.today()
delta = timedelta(days=3)
print(d + delta)
print(d - delta)

结果

如何计算两个小时前的时间和两个小时后的时间

now_hour = datetime.now()
delta = timedelta(hours=2)
print(now_hour - delta)
print(now_hour + delta)

结果

返回两个时间 想计算两个时间之间的时间差

now_time = datetime.now()
print(now_time)
pwd_time = os.path.getmtime('/etc/passwd')
print(pwd_time)
pwd_time_obj = datetime.fromtimestamp(pwd_time)
print(pwd_time_obj)
dalta = now_time - pwd_time_obj
print(delta)

结果