python开发_python日期操作

在python中对日期进行操作的库有：

 import datetime
 import time

对日期格式化信息，可以参考官方API：

time.strftime

datetime

下面是我做的demo：

 #datetime
 
 import datetime
 
 #当前日期
 now = datetime.datetime.now()
 print(now.strftime('%Y-%m-%d %H:%M:%S'))
 print(now.strftime('%Y-%m-%d'))
 
 #string convert to datetime
 time_str = '2013-07-29 01:05:00'
 str_convert_2_time = datetime.datetime.strptime(time_str, '%Y-%m-%d %H:%M:%S')
 print(str_convert_2_time)
 
 #比较两个日期相差多少天
 time_strA = '2013-07-29 01:05:00'
 time_strB ='2013-08-29 01:05:00'
 day = datetime.datetime.strptime(time_strA, '%Y-%m-%d %H:%M:%S')
 day2 = datetime.datetime.strptime(time_strB, '%Y-%m-%d %H:%M:%S')
 sub_day = day2 - day
 print('{0}和{1}相差{2}天'.format(time_strA, time_strB, str(sub_day.days)))
 
 #今后的n天的日期
 n_days = 4
 now = datetime.datetime.now()
 my_date = datetime.timedelta(days=n_days)
 n_day = now + my_date
 print('从今天起的{0}天的日期是：'.format(n_days))
 print(n_day.strftime('%Y-%m-%d %H:%M:%S'))

运行效果：

Python 3.3.2 (v3.3.2:d047928ae3f6, May 16 2013, 00:03:43) [MSC v.1600 32 bit (Intel)] on win32
Type "copyright", "credits" or "license()" for more information.
>>> ================================ RESTART ================================
>>>
2013-07-29 01:48:16
2013-07-29
2013-07-29 01:05:00
2013-07-29 01:05:00和2013-08-29 01:05:00相差31天
从今天起的4天的日期是：
2013-08-02 01:48:16
>>>