datetime 计算时间差

计算时间差：

　　.date()       # 格式化

　　.timedelta()         # 时间差

import datetime

# 今天
today = datetime.datetime.now()
print(today)  # 2019-03-11 16:24:23.792301

today = datetime.datetime.now().date()
print(today)  # 2019-03-11

# 昨天
yesterday = datetime.datetime.now().date() - datetime.timedelta(days=1)
print(yesterday)  # 2019-03-10

# 一周前
weekdelta = datetime.datetime.now().date() - datetime.timedelta(weeks=1)
print(weekdelta)  # 2019-03-04

# 一个月前
monthago = datetime.datetime.now().date() - datetime.timedelta(weeks=4)
print(monthago)  # 2019-02-11

参考博客：

　　https://www.cnblogs.com/amber-liu/p/10120503.html

1. time模块官方文档
2. datetime模块官方文档
3. 廖雪峰的官方网站
4. http://blog.csdn.net/you_are_my_dream/article/details/61616465
5. http://blog.csdn.net/tigerking1017/article/details/51332220
6. http://blog.csdn.net/cherdw/article/details/55224209
7. https://www.cnblogs.com/cindy-cindy/p/6720196.html
8. https://blog.csdn.net/python3_2017/article/details/78983370
9. https://blog.csdn.net/qq_25420115/article/details/53149669