datetime.timedelta计算2个时间的时间差：

注：

1、datetime.timedelta支持days、seconds、microseconds2、找出24小时内的数据3、找出超过1天、1月、1年的数据4、配合datetime.datetime.fromtimestamp(os.path.getmtime(os.path.join(root,f)))抓取文件修改日期进行日期比较

vi a1.py

#!/usr/bin/python

import datetime

now = datetime.datetime.now()

deltaH = datetime.timedelta(seconds=1)

deltaD = datetime.timedelta(days=1)

deltaM = datetime.timedelta(days=30)deltaY = datetime.timedelta(days=365)

Hour = now - deltaH

day = now - deltaDMon = now - deltaMYear = now - deltaY

print Hour

print dayprint Monprint Year:wq

python a1.py