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

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