Python中datetime常用时间处理方法

常用时间转换及处理函数：

import datetime
# 获取当前时间
d1 = datetime.datetime.now()
print d1
# 当前时间加上半小时
d2 = d1 + datetime.timedelta(hours=0.5)
print d2
# 格式化字符串输出
d3 = d2.strftime(\'%Y-%m-%d %H:%M:%S\')
print d3
# 将字符串转化为时间类型
d4 = datetime.datetime.strptime(date,\'%Y-%m-%d %H:%M:%S.%f\')
print d4

获取本周和本月第一天的日期：

# -*- coding:utf-8 -*-
import datetime
def first_day_of_month():
  \'\'\'
  获取本月第一天
  :return:
  \'\'\'
  # now_date = datetime.datetime.now()
  # return (now_date + datetime.timedelta(days=-now_date.day + 1)).replace(hour=0, minute=0, second=0,
  # microsecond=0)
  return datetime.date.today() - datetime.timedelta(days=datetime.datetime.now().day - 1)
def first_day_of_week():
  \'\'\'
  获取本周第一天
  :return:
  \'\'\'
  return datetime.date.today() - datetime.timedelta(days=datetime.date.today().weekday())
if __name__ == \"__main__\":
  this_week = first_day_of_week()
  last_week = this_week - datetime.timedelta(days=7)
  this_month = first_day_of_month()
  last_month = this_month - datetime.timedelta(days=(this_month - datetime.timedelta(days=1)).day)
  print this_week
  print last_week
  print this_month
  print last_month

#! /usr/bin/python
# coding=utf-8

import datetime

\"\"\"
datetime的功能强大
能支持0001年到9999年
\"\"\"

\"\"\"
当前时间
返回的是一个datetime类型
now方法有个参数tz，设置时区类型。如果没有和方法today的效果一样
\"\"\"
now = datetime.datetime.now()
#UTC时间
datetime.datetime.utcnow()
attrs = [
(\"year\",\"年\"),(\'month\',\"月\"),(\"day\",\"日\"),(\'hour\',\"小时\"),( \'minute\',\"分\"),( \'second\',\"秒\"),( \'microsecond\',\"毫秒\"),(
\'min\',\"最小\"),( \'max\',\"最大\"),
]
for k,v in attrs:
  \"now.%s = %s #%s\" % (k,getattr(now, k),v)


\"\"\"
返回一个time结构
\"\"\"
now.timetuple() 

\"\"\"
返回一个date类型

\"\"\"
now.date()

\"\"\"
返回一个time类型

\"\"\"
now.time()

\"\"\"
当前星期几。星期一是0，星期于是6
注意这里是方法，不是属性哦。
\"\"\"
now.weekday()

\"\"\"
当前星期几。星期一是1，星期于是7
注意这里是方法，不是属性哦。
\"\"\"
now.isoweekday()

\"\"\"
修改当前时间。比如修改成当月1号
\"\"\"
now.replace(day=1)

past = datetime.datetime(2010,11,12,13,14,15,16)

\"\"\"
进行比较运算
返回的是timedelta类型

\"\"\"
now-past
\"\"\"
转成字符串
详细规则见Time篇

\"\"\"
strdatetime = now.strftime(\"%Y-%m-%d %H:%M:%S\")
\"\"\"
字符串生成datetime对象
\"\"\"
datetime.datetime.strptime(strdatetime, \"%Y-%m-%d %H:%M:%S\")

以上所述就是本文的全部内容了，希望大家能够喜欢。