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Mysql格式化日期函数
DATE_FORMAT（date,format）根据格式化串format格式化日期或日期和时间值date,返回结果串。
DATE_FORMAT()来格式化DATE或者DATETIME值，以便得到所希望的格式。
根据format字符串格式化date值:
%S, %s 两位数字形式的秒（ 00,01, . . ., 59）
%i 两位数字形式的分（ 00,01, . . ., 59）
%H 两位数字形式的小时，24 小时（00,01, . . ., 23）
%h, %I 两位数字形式的小时，12 小时（01,02, . . ., 12）
%k 数字形式的小时，24 小时（0,1, . . ., 23）
%l 数字形式的小时，12 小时（1, 2, . . ., 12）
%T 24 小时的时间形式（h h : m m : s s）
%r 12 小时的时间形式（hh:mm:ss AM 或hh:mm:ss PM）
%p AM 或P M
%W 一周中每一天的名称（ S u n d a y, Monday, . . ., Saturday）
%a 一周中每一天名称的缩写（ Sun, Mon, . . ., Sat）
%d 两位数字表示月中的天数（ 00, 01, . . ., 31）
%e 数字形式表示月中的天数（ 1, 2， . . ., 31）
%D 英文后缀表示月中的天数（ 1st, 2nd, 3rd, . . .）
%w 以数字形式表示周中的天数（ 0 = S u n d a y, 1=Monday, . . ., 6=Saturday）
%j 以三位数字表示年中的天数（ 001, 002, . . ., 366）
% U 周（0, 1, 52），其中Sunday 为周中的第一天
%u 周（0, 1, 52），其中Monday 为周中的第一天
%M 月名（J a n u a r y, February, . . ., December）
%b 缩写的月名（ J a n u a r y, February, . . ., December）
%m 两位数字表示的月份（ 01, 02, . . ., 12）
%c 数字表示的月份（ 1, 2, . . ., 12）
%Y 四位数字表示的年份
%y 两位数字表示的年份
%% 直接值“%”
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