python开发_python日期操作
在python中对日期进行操作的库有：
1 import datetime 2 import time
对日期格式化信息，可以参考官方API：
下面是我做的demo：
1 #datetime 2 3 import datetime 4 5 #当前日期 6 now = datetime.datetime.now() 7 print(now.strftime('%Y-%m-%d %H:%M:%S')) 8 print(now.strftime('%Y-%m-%d')) 9 10 #string convert to datetime 11 time_str = '2013-07-29 01:05:00' 12 str_convert_2_time = datetime.datetime.strptime(time_str, '%Y-%m-%d %H:%M:%S') 13 print(str_convert_2_time) 14 15 #比较两个日期相差多少天 16 time_strA = '2013-07-29 01:05:00' 17 time_strB ='2013-08-29 01:05:00' 18 day = datetime.datetime.strptime(time_strA, '%Y-%m-%d %H:%M:%S') 19 day2 = datetime.datetime.strptime(time_strB, '%Y-%m-%d %H:%M:%S') 20 sub_day = day2 - day 21 print('{0}和{1}相差{2}天'.format(time_strA, time_strB, str(sub_day.days))) 22 23 24 #今后的n天的日期 25 n_days = 4 26 now = datetime.datetime.now() 27 my_date = datetime.timedelta(days=n_days) 28 n_day = now + my_date 29 print('从今天起的{0}天的日期是：'.format(n_days)) 30 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 >>>
