~~~ //日期信息 SELECT EXTRACT(YEAR FROM '2009-07-02'); ->2009 SELECT EXTRACT(MONTH FROM '2009-07-02'); ->7 SELECT EXTRACT(DAY FROM '2009-07-02'); ->2 //时间信息 SELECT EXTRACT(HOUR FROM '2009-07-02 12:10:00'); ->12 SELECT EXTRACT(MINUTE FROM '2009-07-02 12:10:00'); ->10 SELECT EXTRACT(SECOND FROM '2009-07-02 12:10:00'); ->0 ~~~ 查询日期星期索引 ~~~ DAYOFWEEK(date) ~~~ Returns the weekday index for date (1 = Sunday, 2 = Monday, …, 7 = Saturday). These index values correspond to the ODBC standard. ~~~ mysql> SELECT DAYOFWEEK('2007-02-03'); -> 7 ~~~ 查询日期星期索引名称 ~~~ DAYNAME(date) ~~~ Returns the name of the weekday for date. The language used for the name is controlled by the value of the lc_time_names system variable (Section 10.15, “MySQL Server Locale Support”). ~~~ mysql> SELECT DAYNAME('2007-02-03'); -> 'Saturday' ~~~ 查询日期的月份索引 ~~~ DAYOFMONTH(date) ~~~ Returns the day of the month for date, in the range 1 to 31, or 0 for dates such as '0000-00-00' or '2008-00-00' that have a zero day part. ~~~ mysql> SELECT DAYOFMONTH('2007-02-03'); -> 3 ~~~ 日期时间格式化函数 ~~~ DATE_FORMAT(date,format) ~~~ Formats the date value according to the format string. The following specifiers may be used in the format string. The % character is required before format specifier characters. |Specifier |Description| |--|--| |%a |Abbreviated weekday name (Sun..Sat)| |%b |Abbreviated month name (Jan..Dec)| |%c |Month, numeric (0..12)| |%D |Day of the month with English suffix (0th, 1st, 2nd, 3rd, …)| |%d |Day of the month, numeric (00..31)| |%e |Day of the month, numeric (0..31)| |%f |Microseconds (000000..999999)| |%H |Hour (00..23)| |%h |Hour (01..12)| |%I |Hour (01..12)| |%i |Minutes, numeric (00..59)| |%j |Day of year (001..366)| |%k Hour (0..23)| |%l |Hour (1..12)| |%M| Month name (January..December)| |%m |Month, numeric (00..12)| |%p |AM or PM| |%r |Time, 12-hour (hh:mm:ss followed by AM or PM)| |%S |Seconds (00..59)| |%s |Seconds (00..59)| |%T |Time, 24-hour (hh:mm:ss)| |%U |Week (00..53), where Sunday is the first day of the week; WEEK() mode 0| |%u |Week (00..53), where Monday is the first day of the week; WEEK() mode 1| |%V |Week (01..53), where Sunday is the first day of the week; WEEK() mode 2; used with %X| |%v |Week (01..53), where Monday is the first day of the week; WEEK() mode 3; used with %x| |%W |Weekday name (Sunday..Saturday)| |%w |Day of the week (0=Sunday..6=Saturday)| |%X |Year for the week where Sunday is the first day of the week, numeric, four digits; used with %V| |%x |Year for the week, where Monday is the first day of the week, numeric, four digits; used with %v| |%Y |Year, numeric, four digits| |%y |Year, numeric (two digits)| |%% |A literal % character| |%x |x, for any “x” not listed above| returns a string with a character set and collation given by character_set_connection and collation_connection so that it can return month and weekday names containing non-ASCII characters. ~~~ DATE_FORMAT() ~~~ ~~~ mysql> SELECT DATE_FORMAT('2009-10-04 22:23:00', '%W %M %Y'); -> 'Sunday October 2009' mysql> SELECT DATE_FORMAT('2007-10-04 22:23:00', '%H:%i:%s'); -> '22:23:00' mysql> SELECT DATE_FORMAT('1900-10-04 22:23:00', -> '%D %y %a %d %m %b %j'); -> '4th 00 Thu 04 10 Oct 277' mysql> SELECT DATE_FORMAT('1997-10-04 22:23:00', -> '%H %k %I %r %T %S %w'); -> '22 22 10 10:23:00 PM 22:23:00 00 6' mysql> SELECT DATE_FORMAT('1999-01-01', '%X %V'); -> '1998 52' mysql> SELECT DATE_FORMAT('2006-06-00', '%d'); -> '00' ~~~ 参考信息：https://dev.mysql.com/doc/refman/5.7/en/date-and-time-functions.html