Python 的时间格式化

对于像'Wed, 11 Apr 2012 09:37:05 +0800'的时间格式化可如下解：

>>> date='Wed, 11 Apr 2012 09:37:05 +0800'
>>> dd=datetime.datetime.strptime(date,'%a, %d %b %Y %H:%M:%S %z')
>>> dd.strftime('%Y-%m-%d %H:%M:%S')

Python格式化日期时间的函数为datetime.datetime.strftime()；由字符串转为日期型的函数为：datetime.datetime.strptime()，两个函数都涉及日期时间的格式化字符串，列举如下：

%a Abbreviated weekday name   
%A Full weekday name   
%b Abbreviated month name   
%B Full month name   
%c Date and time representation appropriate for locale   
%d Day of month as decimal number (01 - 31)   
%H Hour in 24-hour format (00 - 23)   
%I Hour in 12-hour format (01 - 12)   
%j Day of year as decimal number (001 - 366)   
%m Month as decimal number (01 - 12)   
%M Minute as decimal number (00 - 59)   
%p Current locale's A.M./P.M. indicator for 12-hour clock   
%S Second as decimal number (00 - 59)   
%U Week of year as decimal number, with Sunday as first day of week (00 - 51)   
%w Weekday as decimal number (0 - 6; Sunday is 0)   
%W Week of year as decimal number, with Monday as first day of week (00 - 51)   
%x Date representation for current locale   
%X Time representation for current locale   
%y Year without century, as decimal number (00 - 99)   
%Y Year with century, as decimal number   
%z, %Z Time-zone name or abbreviation; no characters if time zone is unknown   
%% Percent sign