datetime库

处理时间的标准函数库datetime

datetime.now()获取当前日期和时间

字符串->datetime

datetime.strptime(),解析时间字符串

datetime->字符串

datetime.strftime格式化datetime为字符串表示

isocalendar()返回年，周数，及周几

import datetime
print(datetime.datetime.now())

2019-08-15 09:27:29.373910

import datetime
DateNow = datetime.datetime.now()
print(DateNow.day)
print(DateNow.month)
print(DateNow.year)

strptime的用法

# -*- coding:utf-8 -*-
import datetime
print(datetime.datetime.strptime('2017/08/05',format('%Y/%m/%d')))

isocalendar的用法

import datetime
now = datetime.datetime.now()
print(now.isocalendar())  #返回年数，周数，星期几

strftime的用法

import datetime
now = datetime.datetime.now()
time = datetime.datetime.strftime(now,'%Y-%m-%d')
print(time)