Python的datetime

总会用到日期格式化和字符串转成日期，贴点代码以供参考，其实API真的是很全的，可是又不知道具体的method...

datetime.datetime.strftime(format_str)：返回格式化后的日期字符串 记忆- strFormattime

datetime.datetime.strptime(date_str,format_str)：由字符串转为日期型 记忆- strParsetime

格式化参数

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

代码示例

from datetime import datetime

d = datetime.now()

print(d)

# 2016-05-11 17:37:32.318566

print(d.strftime('%y-%m-%d'))

# 16-05-11

print(d.strftime('%Y-%m-%d'))

# 2016-05-11

print(d.strftime('%Y-%m-%d %H:%M:%S'))

# 2016-05-11 17:37:32

# 字符串转日期就是要告诉程序传入的字符串各部分代表什么

datetime.strptime('2016-05-11 17:37:32', '%Y-%m-%d %H:%M:%S')