Mysql日期和时间函数不求人

DATE_FORMAT(date,format) 根据format字符串格式化date值。下列修饰符可以被用在format字符串中： %M 月名字(January……December) %W 星期名字(Sunday……Saturday) %D 有英语前缀的月份的日期(1st, 2nd, 3rd, 等等。） %Y 年, 数字, 4 位 %y 年, 数字, 2 位 %a 缩写的星期名字(Sun……Sat) %d 月份中的天数, 数字(00……31) %e 月份中的天数, 数字(0……31) %m 月, 数字(01……12) %c 月, 数字(1……12) %b 缩写的月份名字(Jan……Dec) %j 一年中的天数(001……366) %H 小时(00……23) %k 小时(0……23) %h 小时(01……12) %I 小时(01……12) %l 小时(1……12) %i 分钟, 数字(00……59) %r 时间,12 小时(hh:mm:ss [AP]M) %T 时间,24 小时(hh:mm:ss) %S 秒(00……59) %s 秒(00……59) %p AM或PM %w 一个星期中的天数(0=Sunday ……6=Saturday ） %U 星期(0……52), 这里星期天是星期的第一天 %u 星期(0……52), 这里星期一是星期的第一天 %% 一个文字“%”。

所有的其他字符不做解释被复制到结果中。

mysql> select DATE_FORMAT('1997-10-04 22:23:00', '%W %M %Y'); -> 'Saturday October 1997' mysql> select DATE_FORMAT('1997-10-04 22:23:00', '%H:%i:%s'); -> '22:23:00' mysql> select DATE_FORMAT('1997-10-04 22:23:00', '%D %y %a %d %m %b %j'); -> '4th 97 Sat 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' MySQL3.23中，在格式修饰符字符前需要%。在MySQL更早的版本中，%是可选的。

TIME_FORMAT(time,format) 这象上面的DATE_FORMAT()函数一样使用，但是format字符串只能包含处理小时、分钟和秒的那些格式修饰符。

其他修饰符产生一个NULL值或0。 CURDATE() 　 CURRENT_DATE 以'YYYY-MM-DD'或YYYYMMDD格式返回今天日期值，取决于函数是在一个字符串还是数字上下文被使用。 mysql> select CURDATE(); -> '1997-12-15' mysql> select CURDATE() + 0; -> 19971215

CURTIME() 　 CURRENT_TIME 以'HH:MM:SS'或HHMMSS格式返回当前时间值，取决于函数是在一个字符串还是在数字的上下文被使用。 mysql> select CURTIME(); -> '23:50:26' mysql> select CURTIME() + 0; -> 235026

NOW() 　 SYSDATE() 　 CURRENT_TIMESTAMP 以'YYYY-MM-DD HH:MM:SS'或YYYYMMDDHHMMSS格式返回当前的日期和时间，取决于函数是在一个字符串还是在数字的 上下文被使用。 mysql> select NOW(); -> '1997-12-15 23:50:26' mysql> select NOW() + 0; -> 19971215235026

UNIX_TIMESTAMP() 　 UNIX_TIMESTAMP(date) 如果没有参数调用，返回一个Unix时间戳记(从'1970-01-01 00:00:00'GMT开始的秒数)。如果UNIX_TIMESTAMP()用一个date参数被调用，它返回从'1970-01-01 00:00:00' GMT开始的秒数值。date可以是一个DATE字符串、一个DATETIME字符串、一个TIMESTAMP或以YYMMDD或YYYYMMDD格式的本地时间的一个数字。 mysql> select UNIX_TIMESTAMP(); -> 882226357 mysql> select UNIX_TIMESTAMP('1997-10-04 22:23:00'); -> 875996580

当UNIX_TIMESTAMP被用于一个TIMESTAMP列，函数将直接接受值，没有隐含的“string-to-unix-timestamp”变换 www.knowsky.com。

FROM_UNIXTIME(unix_timestamp) 以'YYYY-MM-DD HH:MM:SS'或YYYYMMDDHHMMSS格式返回unix_timestamp参数所表示的值，取决于函数是在一个字符串还是或数字上下文中被使用。 mysql> select FROM_UNIXTIME(875996580); -> '1997-10-04 22:23:00' mysql> select FROM_UNIXTIME(875996580) + 0; -> 19971004222300

FROM_UNIXTIME(unix_timestamp,format) 返回表示 Unix 时间标记的一个字符串，根据format字符串格式化。format可以包含与DATE_FORMAT()函数列出的条目同样的修饰符。 mysql> select FROM_UNIXTIME(UNIX_TIMESTAMP(), '%Y %D %M %h:%i:%s %x'); -> '1997 23rd December 03:43:30 x'

SEC_TO_TIME(seconds) 返回seconds参数，变换成小时、分钟和秒，值以'HH:MM:SS'或HHMMSS格式化，取决于函数是在一个字符串还是在数字上下文中被使用。 mysql> select SEC_TO_TIME(2378); -> '00:39:38' mysql> select SEC_TO_TIME(2378) + 0; -> 3938

TIME_TO_SEC(time) 返回time参数，转换成秒。 mysql> select TIME_TO_SEC('22:23:00'); -> 80580 mysql> select TIME_TO_SEC('00:39:38'); -> 2378

对于每个类型拥有的值范围以及并且指定日期何时间值的有效格式的描述见7.3.6<wbr></wbr>日期和时间类型。<wbr></wbr><wbr></wbr> 这里是一个使用日期函数的例子。下面的查询选择了所有记录，其date_col的值是在最后30天以内：<wbr></wbr><wbr></wbr> mysql><wbr></wbr>SELECT<wbr></wbr>something<wbr></wbr>FROM<wbr></wbr>table<wbr></wbr><wbr></wbr> WHERE<wbr></wbr>TO_DAYS(NOW())<wbr></wbr>-<wbr></wbr>TO_DAYS(date_col)<wbr></wbr><=<wbr></wbr>30;<wbr></wbr><wbr></wbr> DAYOFWEEK(date)<wbr></wbr><wbr></wbr> 返回日期date的星期索引(1=星期天，2=星期一,<wbr></wbr>……7=星期六)。这些索引值对应于ODBC标准。<wbr></wbr><wbr></wbr> mysql><wbr></wbr>select<wbr></wbr>DAYOFWEEK('1998-02-03');<wbr></wbr><wbr></wbr> -><wbr></wbr>3<wbr></wbr><wbr></wbr> WEEKDAY(date)<wbr></wbr><wbr></wbr> 返回date的星期索引(0=星期一，1=星期二,<wbr></wbr>……6=<wbr></wbr>星期天)。<wbr></wbr><wbr></wbr> mysql><wbr></wbr>select<wbr></wbr>WEEKDAY('1997-10-04<wbr></wbr>22:23:00');<wbr></wbr><wbr></wbr> -><wbr></wbr>5<wbr></wbr><wbr></wbr> mysql><wbr></wbr>select<wbr></wbr>WEEKDAY('1997-11-05');<wbr></wbr><wbr></wbr> -><wbr></wbr>2<wbr></wbr><wbr></wbr> DAYOFMONTH(date)<wbr></wbr><wbr></wbr> 返回date的月份中日期，在1到31范围内。<wbr></wbr><wbr></wbr> mysql><wbr></wbr>select<wbr></wbr>DAYOFMONTH('1998-02-03');<wbr></wbr><wbr></wbr> -><wbr></wbr>3<wbr></wbr><wbr></wbr> DAYOFYEAR(date)<wbr></wbr><wbr></wbr> 返回date在一年中的日数,<wbr></wbr>在1到366范围内。<wbr></wbr><wbr></wbr> mysql><wbr></wbr>select<wbr></wbr>DAYOFYEAR('1998-02-03');<wbr></wbr><wbr></wbr> -><wbr></wbr>34<wbr></wbr><wbr></wbr> MONTH(date)<wbr></wbr><wbr></wbr> 返回date的月份，范围1到12。<wbr></wbr><wbr></wbr> mysql><wbr></wbr>select<wbr></wbr>MONTH('1998-02-03');<wbr></wbr><wbr></wbr> -><wbr></wbr>2<wbr></wbr><wbr></wbr> DAYNAME(date)<wbr></wbr><wbr></wbr> 返回date的星期名字。<wbr></wbr><wbr></wbr> mysql><wbr></wbr>select<wbr></wbr>DAYNAME("1998-02-05");<wbr></wbr><wbr></wbr> -><wbr></wbr>'Thursday'<wbr></wbr><wbr></wbr> MONTHNAME(date)<wbr></wbr><wbr></wbr> 返回date的月份名字。<wbr></wbr><wbr></wbr> mysql><wbr></wbr>select<wbr></wbr>MONTHNAME("1998-02-05");<wbr></wbr><wbr></wbr> -><wbr></wbr>'February'<wbr></wbr><wbr></wbr> QUARTER(date)<wbr></wbr><wbr></wbr> 返回date一年中的季度，范围1到4。<wbr></wbr><wbr></wbr> mysql><wbr></wbr>select<wbr></wbr>QUARTER('98-04-01');<wbr></wbr><wbr></wbr> -><wbr></wbr>2<wbr></wbr><wbr></wbr> WEEK(date)<wbr></wbr><wbr></wbr> 　<wbr></wbr><wbr></wbr> WEEK(date,first)<wbr></wbr><wbr></wbr> 对于星期天是一周的第一天的地方，有一个单个参数，返回date的周数，范围在0到52。2个参数形式WEEK()允许<wbr></wbr> 你指定星期是否开始于星期天或星期一。如果第二个参数是0，星期从星期天开始，如果第二个参数是1，<wbr></wbr> 从星期一开始。<wbr></wbr><wbr></wbr> mysql><wbr></wbr>select<wbr></wbr>WEEK('1998-02-20');<wbr></wbr><wbr></wbr> -><wbr></wbr>7<wbr></wbr><wbr></wbr> mysql><wbr></wbr>select<wbr></wbr>WEEK('1998-02-20',0);<wbr></wbr><wbr></wbr> -><wbr></wbr>7<wbr></wbr><wbr></wbr> mysql><wbr></wbr>select<wbr></wbr>WEEK('1998-02-20',1);<wbr></wbr><wbr></wbr> -><wbr></wbr>8<wbr></wbr><wbr></wbr> YEAR(date)<wbr></wbr><wbr></wbr> 返回date的年份，范围在1000到9999。<wbr></wbr><wbr></wbr> mysql><wbr></wbr>select<wbr></wbr>YEAR('98-02-03');<wbr></wbr><wbr></wbr> -><wbr></wbr>1998<wbr></wbr><wbr></wbr> HOUR(time)<wbr></wbr><wbr></wbr> 返回time的小时，范围是0到23。<wbr></wbr><wbr></wbr> mysql><wbr></wbr>select<wbr></wbr>HOUR('10:05:03');<wbr></wbr><wbr></wbr> -><wbr></wbr>10<wbr></wbr><wbr></wbr> MINUTE(time)<wbr></wbr><wbr></wbr> 返回time的分钟，范围是0到59。<wbr></wbr><wbr></wbr> mysql><wbr></wbr>select<wbr></wbr>MINUTE('98-02-03<wbr></wbr>10:05:03');<wbr></wbr><wbr></wbr> -><wbr></wbr>5<wbr></wbr><wbr></wbr> SECOND(time)<wbr></wbr><wbr></wbr> 回来time的秒数，范围是0到59。<wbr></wbr><wbr></wbr> mysql><wbr></wbr>select<wbr></wbr>SECOND('10:05:03');<wbr></wbr><wbr></wbr> -><wbr></wbr>3<wbr></wbr><wbr></wbr> PERIOD_ADD(P,N)<wbr></wbr><wbr></wbr> 增加N个月到阶段P（以格式YYMM或YYYYMM)。以格式YYYYMM返回值。注意阶段参数P不是日期值。<wbr></wbr><wbr></wbr> mysql><wbr></wbr>select<wbr></wbr>PERIOD_ADD(9801,2);<wbr></wbr><wbr></wbr> -><wbr></wbr>199803<wbr></wbr><wbr></wbr> PERIOD_DIFF(P1,P2)<wbr></wbr><wbr></wbr> 返回在时期P1和P2之间月数，P1和P2应该以格式YYMM或YYYYMM。注意，时期参数P1和P2不是日期值。<wbr></wbr><wbr></wbr> mysql><wbr></wbr>select<wbr></wbr>PERIOD_DIFF(9802,199703);<wbr></wbr><wbr></wbr> -><wbr></wbr>11<wbr></wbr><wbr></wbr> DATE_ADD(date,INTERVAL<wbr></wbr>expr<wbr></wbr>type)<wbr></wbr><wbr></wbr> 　<wbr></wbr><wbr></wbr> DATE_SUB(date,INTERVAL<wbr></wbr>expr<wbr></wbr>type)<wbr></wbr><wbr></wbr> 　<wbr></wbr><wbr></wbr> ADDDATE(date,INTERVAL<wbr></wbr>expr<wbr></wbr>type)<wbr></wbr><wbr></wbr> 　<wbr></wbr><wbr></wbr> SUBDATE(date,INTERVAL<wbr></wbr>expr<wbr></wbr>type)<wbr></wbr><wbr></wbr> 这些功能执行日期运算。对于MySQL<wbr></wbr>3.22，他们是新的。ADDDATE()和SUBDATE()是DATE_ADD()和DATE_SUB()的同义词。<wbr></wbr> 在MySQL<wbr></wbr>3.23中，你可以使用+和-而不是DATE_ADD()和DATE_SUB()。（见例子）date是一个指定开始日期的<wbr></wbr> DATETIME或DATE值，expr是指定加到开始日期或从开始日期减去的间隔值一个表达式，expr是一个字符串；它可以以<wbr></wbr> 一个“-”开始表示负间隔。type是一个关键词，指明表达式应该如何被解释。EXTRACT(type<wbr></wbr>FROM<wbr></wbr>date)函数从日期<wbr></wbr> 中返回“type”间隔。下表显示了type和expr参数怎样被关联：<wbr></wbr>type值<wbr></wbr>含义<wbr></wbr>期望的expr格式<wbr></wbr><wbr></wbr> SECOND<wbr></wbr>秒<wbr></wbr>SECONDS<wbr></wbr><wbr></wbr> MINUTE<wbr></wbr>分钟<wbr></wbr>MINUTES<wbr></wbr><wbr></wbr> HOUR<wbr></wbr>时间<wbr></wbr>HOURS<wbr></wbr><wbr></wbr> DAY<wbr></wbr>天<wbr></wbr>DAYS<wbr></wbr><wbr></wbr> MONTH<wbr></wbr>月<wbr></wbr>MONTHS<wbr></wbr><wbr></wbr> YEAR<wbr></wbr>年<wbr></wbr>YEARS<wbr></wbr><wbr></wbr> MINUTE_SECOND<wbr></wbr>分钟和秒<wbr></wbr>"MINUTES:SECONDS"<wbr></wbr><wbr></wbr> HOUR_MINUTE<wbr></wbr>小时和分钟<wbr></wbr>"HOURS:MINUTES"<wbr></wbr><wbr></wbr> DAY_HOUR<wbr></wbr>天和小时<wbr></wbr>"DAYS<wbr></wbr>HOURS"<wbr></wbr><wbr></wbr> YEAR_MONTH<wbr></wbr>年和月<wbr></wbr>"YEARS-MONTHS"<wbr></wbr><wbr></wbr> HOUR_SECOND<wbr></wbr>小时,<wbr></wbr>分钟，<wbr></wbr>"HOURS:MINUTES:SECONDS"<wbr></wbr><wbr></wbr> DAY_MINUTE<wbr></wbr>天,<wbr></wbr>小时,<wbr></wbr>分钟<wbr></wbr>"DAYS<wbr></wbr>HOURS:MINUTES"<wbr></wbr><wbr></wbr> DAY_SECOND<wbr></wbr>天,<wbr></wbr>小时,<wbr></wbr>分钟,<wbr></wbr>秒<wbr></wbr>"DAYS<wbr></wbr>HOURS:MINUTES:SECONDS"<wbr></wbr><wbr></wbr> MySQL在expr格式中允许任何标点分隔符。表示显示的是建议的分隔符。如果date参数是一个DATE值并且你的计算仅仅<wbr></wbr> 包含YEAR、MONTH和DAY部分(即，没有时间部分)，结果是一个DATE值。否则结果是一个DATETIME值。<wbr></wbr><wbr></wbr> mysql><wbr></wbr>SELECT<wbr></wbr>"1997-12-31<wbr></wbr>23:59:59"<wbr></wbr>+<wbr></wbr>INTERVAL<wbr></wbr>1<wbr></wbr>SECOND;<wbr></wbr><wbr></wbr> -><wbr></wbr>1998-01-01<wbr></wbr>00:00:00<wbr></wbr><wbr></wbr> mysql><wbr></wbr>SELECT<wbr></wbr>INTERVAL<wbr></wbr>1<wbr></wbr>DAY<wbr></wbr>+<wbr></wbr>"1997-12-31";<wbr></wbr><wbr></wbr> -><wbr></wbr>1998-01-01<wbr></wbr><wbr></wbr> mysql><wbr></wbr>SELECT<wbr></wbr>"1998-01-01"<wbr></wbr>-<wbr></wbr>INTERVAL<wbr></wbr>1<wbr></wbr>SECOND;<wbr></wbr><wbr></wbr> -><wbr></wbr>1997-12-31<wbr></wbr>23:59:59<wbr></wbr><wbr></wbr> mysql><wbr></wbr>SELECT<wbr></wbr>DATE_ADD("1997-12-31<wbr></wbr>23:59:59",<wbr></wbr><wbr></wbr> INTERVAL<wbr></wbr>1<wbr></wbr>SECOND);<wbr></wbr><wbr></wbr> -><wbr></wbr>1998-01-01<wbr></wbr>00:00:00<wbr></wbr><wbr></wbr> mysql><wbr></wbr>SELECT<wbr></wbr>DATE_ADD("1997-12-31<wbr></wbr>23:59:59",<wbr></wbr><wbr></wbr> INTERVAL<wbr></wbr>1<wbr></wbr>DAY);<wbr></wbr><wbr></wbr> -><wbr></wbr>1998-01-01<wbr></wbr>23:59:59<wbr></wbr><wbr></wbr> mysql><wbr></wbr>SELECT<wbr></wbr>DATE_ADD("1997-12-31<wbr></wbr>23:59:59",<wbr></wbr><wbr></wbr> INTERVAL<wbr></wbr>"1:1"<wbr></wbr>MINUTE_SECOND);<wbr></wbr><wbr></wbr> -><wbr></wbr>1998-01-01<wbr></wbr>00:01:00<wbr></wbr><wbr></wbr> mysql><wbr></wbr>SELECT<wbr></wbr>DATE_SUB("1998-01-01<wbr></wbr>00:00:00",<wbr></wbr><wbr></wbr> INTERVAL<wbr></wbr>"1<wbr></wbr>1:1:1"<wbr></wbr>DAY_SECOND);<wbr></wbr><wbr></wbr> -><wbr></wbr>1997-12-30<wbr></wbr>22:58:59<wbr></wbr><wbr></wbr> mysql><wbr></wbr>SELECT<wbr></wbr>DATE_ADD("1998-01-01<wbr></wbr>00:00:00",<wbr></wbr><wbr></wbr> INTERVAL<wbr></wbr>"-1<wbr></wbr>10"<wbr></wbr>DAY_HOUR);<wbr></wbr><wbr></wbr> -><wbr></wbr>1997-12-30<wbr></wbr>14:00:00<wbr></wbr><wbr></wbr> mysql><wbr></wbr>SELECT<wbr></wbr>DATE_SUB("1998-01-02",<wbr></wbr>INTERVAL<wbr></wbr>31<wbr></wbr>DAY);<wbr></wbr><wbr></wbr> -><wbr></wbr>1997-12-02<wbr></wbr><wbr></wbr> mysql><wbr></wbr>SELECT<wbr></wbr>EXTRACT(YEAR<wbr></wbr>FROM<wbr></wbr>"1999-07-02");<wbr></wbr><wbr></wbr> -><wbr></wbr>1999<wbr></wbr><wbr></wbr> mysql><wbr></wbr>SELECT<wbr></wbr>EXTRACT(YEAR_MONTH<wbr></wbr>FROM<wbr></wbr>"1999-07-02<wbr></wbr>01:02:03");<wbr></wbr><wbr></wbr> -><wbr></wbr>199907<wbr></wbr><wbr></wbr> mysql><wbr></wbr>SELECT<wbr></wbr>EXTRACT(DAY_MINUTE<wbr></wbr>FROM<wbr></wbr>"1999-07-02<wbr></wbr>01:02:03");<wbr></wbr><wbr></wbr> -><wbr></wbr>20102<wbr></wbr><wbr></wbr> 如果你指定太短的间隔值(不包括type关键词期望的间隔部分)，MySQL假设你省掉了间隔值的最左面部分。例如，<wbr></wbr> 如果你指定一个type是DAY_SECOND，值expr被希望有天、小时、分钟和秒部分。如果你象"1:10"这样指定值，<wbr></wbr> MySQL假设日子和小时部分是丢失的并且值代表分钟和秒。换句话说，"1:10"<wbr></wbr>DAY_SECOND以它等价于"1:10"<wbr></wbr>MINUTE_SECOND<wbr></wbr> 的方式解释，这对那MySQL解释TIME值表示经过的时间而非作为一天的时间的方式有二义性。如果你使用确实不正确的日期，<wbr></wbr> 结果是NULL。如果你增加MONTH、YEAR_MONTH或YEAR并且结果日期大于新月份的最大值天数，日子在新月用最大的天调整。<wbr></wbr><wbr></wbr> mysql><wbr></wbr>select<wbr></wbr>DATE_ADD('1998-01-30',<wbr></wbr>Interval<wbr></wbr>1<wbr></wbr>month);<wbr></wbr><wbr></wbr> -><wbr></wbr>1998-02-28<wbr></wbr><wbr></wbr> 注意，从前面的例子中词INTERVAL和type关键词不是区分大小写的。<wbr></wbr><wbr></wbr> TO_DAYS(date)<wbr></wbr><wbr></wbr> 给出一个日期date，返回一个天数(从0年的天数)。<wbr></wbr><wbr></wbr> mysql><wbr></wbr>select<wbr></wbr>TO_DAYS(950501);<wbr></wbr><wbr></wbr> -><wbr></wbr>728779<wbr></wbr><wbr></wbr> mysql><wbr></wbr>select<wbr></wbr>TO_DAYS('1997-10-07');<wbr></wbr><wbr></wbr> -><wbr></wbr>729669<wbr></wbr><wbr></wbr> TO_DAYS()不打算用于使用格列高里历(1582)出现前的值。<wbr></wbr><wbr></wbr> FROM_DAYS(N)<wbr></wbr><wbr></wbr> 给出一个天数N，返回一个DATE值。<wbr></wbr><wbr></wbr> mysql><wbr></wbr>select<wbr></wbr>FROM_DAYS(729669);<wbr></wbr><wbr></wbr> -><wbr></wbr>'1997-10-07'<wbr></wbr><wbr></wbr> TO_DAYS()不打算用于使用格列高里历(1582)出现前的值。<wbr></wbr><wbr></wbr> DATE_FORMAT(date,format)<wbr></wbr><wbr></wbr> 根据format字符串格式化date值。下列修饰符可以被用在format字符串中：<wbr></wbr>%M<wbr></wbr>月名字(January……December)<wbr></wbr><wbr></wbr> %W<wbr></wbr>星期名字(Sunday……Saturday)<wbr></wbr><wbr></wbr> %D<wbr></wbr>有英语前缀的月份的日期(1st,<wbr></wbr>2nd,<wbr></wbr>3rd,<wbr></wbr>等等。）<wbr></wbr><wbr></wbr> %Y<wbr></wbr>年,<wbr></wbr>数字,<wbr></wbr>4<wbr></wbr>位<wbr></wbr><wbr></wbr> %y<wbr></wbr>年,<wbr></wbr>数字,<wbr></wbr>2<wbr></wbr>位<wbr></wbr><wbr></wbr> %a<wbr></wbr>缩写的星期名字(Sun……Sat)<wbr></wbr><wbr></wbr> %d<wbr></wbr>月份中的天数,<wbr></wbr>数字(00……31)<wbr></wbr><wbr></wbr> %e<wbr></wbr>月份中的天数,<wbr></wbr>数字(0……31)<wbr></wbr><wbr></wbr> %m<wbr></wbr>月,<wbr></wbr>数字(01……12)<wbr></wbr><wbr></wbr> %c<wbr></wbr>月,<wbr></wbr>数字(1……12)<wbr></wbr><wbr></wbr> %b<wbr></wbr>缩写的月份名字(Jan……Dec)<wbr></wbr><wbr></wbr> %j<wbr></wbr>一年中的天数(001……366)<wbr></wbr><wbr></wbr> %H<wbr></wbr>小时(00……23)<wbr></wbr><wbr></wbr> %k<wbr></wbr>小时(0……23)<wbr></wbr><wbr></wbr> %h<wbr></wbr>小时(01……12)<wbr></wbr><wbr></wbr> %I<wbr></wbr>小时(01……12)<wbr></wbr><wbr></wbr> %l<wbr></wbr>小时(1……12)<wbr></wbr><wbr></wbr> %i<wbr></wbr>分钟,<wbr></wbr>数字(00……59)<wbr></wbr><wbr></wbr> %r<wbr></wbr>时间,12<wbr></wbr>小时(hh:mm:ss<wbr></wbr>[AP]M)<wbr></wbr><wbr></wbr> %T<wbr></wbr>时间,24<wbr></wbr>小时(hh:mm:ss)<wbr></wbr><wbr></wbr> %S<wbr></wbr>秒(00……59)<wbr></wbr><wbr></wbr> %s<wbr></wbr>秒(00……59)<wbr></wbr><wbr></wbr> %p<wbr></wbr>AM或PM<wbr></wbr><wbr></wbr> %w<wbr></wbr>一个星期中的天数(0=Sunday<wbr></wbr>……6=Saturday<wbr></wbr>）<wbr></wbr><wbr></wbr> %U<wbr></wbr>星期(0……52),<wbr></wbr>这里星期天是星期的第一天<wbr></wbr><wbr></wbr> %u<wbr></wbr>星期(0……52),<wbr></wbr>这里星期一是星期的第一天<wbr></wbr><wbr></wbr> %%<wbr></wbr>一个文字“%”。<wbr></wbr><wbr></wbr> 所有的其他字符不做解释被复制到结果中。<wbr></wbr><wbr></wbr> mysql><wbr></wbr>select<wbr></wbr>DATE_FORMAT('1997-10-04<wbr></wbr>22:23:00',<wbr></wbr>'%W<wbr></wbr>%M<wbr></wbr>%Y');<wbr></wbr><wbr></wbr> -><wbr></wbr>'Saturday<wbr></wbr>October<wbr></wbr>1997'<wbr></wbr><wbr></wbr> mysql><wbr></wbr>select<wbr></wbr>DATE_FORMAT('1997-10-04<wbr></wbr>22:23:00',<wbr></wbr>'%H:%i:%s');<wbr></wbr><wbr></wbr> -><wbr></wbr>'22:23:00'<wbr></wbr><wbr></wbr> mysql><wbr></wbr>select<wbr></wbr>DATE_FORMAT('1997-10-04<wbr></wbr>22:23:00',<wbr></wbr><wbr></wbr> '%D<wbr></wbr>%y<wbr></wbr>%a<wbr></wbr>%d<wbr></wbr>%m<wbr></wbr>%b<wbr></wbr>%j');<wbr></wbr><wbr></wbr> -><wbr></wbr>'4th<wbr></wbr>97<wbr></wbr>Sat<wbr></wbr>04<wbr></wbr>10<wbr></wbr>Oct<wbr></wbr>277'<wbr></wbr><wbr></wbr> mysql><wbr></wbr>select<wbr></wbr>DATE_FORMAT('1997-10-04<wbr></wbr>22:23:00',<wbr></wbr><wbr></wbr> '%H<wbr></wbr>%k<wbr></wbr>%I<wbr></wbr>%r<wbr></wbr>%T<wbr></wbr>%S<wbr></wbr>%w');<wbr></wbr><wbr></wbr> -><wbr></wbr>'22<wbr></wbr>22<wbr></wbr>10<wbr></wbr>10:23:00<wbr></wbr>PM<wbr></wbr>22:23:00<wbr></wbr>00<wbr></wbr>6'<wbr></wbr><wbr></wbr> MySQL3.23中，在格式修饰符字符前需要%。在MySQL更早的版本中，%是可选的。<wbr></wbr><wbr></wbr> TIME_FORMAT(time,format)<wbr></wbr><wbr></wbr> 这象上面的DATE_FORMAT()函数一样使用，但是format字符串只能包含处理小时、分钟和秒的那些格式修饰符。<wbr></wbr> 其他修饰符产生一个NULL值或0。<wbr></wbr><wbr></wbr> CURDATE()<wbr></wbr><wbr></wbr> 　<wbr></wbr><wbr></wbr> CURRENT_DATE<wbr></wbr><wbr></wbr> 以'YYYY-MM-DD'或YYYYMMDD格式返回今天日期值，取决于函数是在一个字符串还是数字上下文被使用。<wbr></wbr><wbr></wbr> mysql><wbr></wbr>select<wbr></wbr>CURDATE();<wbr></wbr><wbr></wbr> -><wbr></wbr>'1997-12-15'<wbr></wbr><wbr></wbr> mysql><wbr></wbr>select<wbr></wbr>CURDATE()<wbr></wbr>+<wbr></wbr>0;<wbr></wbr><wbr></wbr> -><wbr></wbr>19971215<wbr></wbr><wbr></wbr> CURTIME()<wbr></wbr><wbr></wbr> 　<wbr></wbr><wbr></wbr> CURRENT_TIME<wbr></wbr><wbr></wbr> 以'HH:MM:SS'或HHMMSS格式返回当前时间值，取决于函数是在一个字符串还是在数字的上下文被使用。<wbr></wbr><wbr></wbr> mysql><wbr></wbr>select<wbr></wbr>CURTIME();<wbr></wbr><wbr></wbr> -><wbr></wbr>'23:50:26'<wbr></wbr><wbr></wbr> mysql><wbr></wbr>select<wbr></wbr>CURTIME()<wbr></wbr>+<wbr></wbr>0;<wbr></wbr><wbr></wbr> -><wbr></wbr>235026<wbr></wbr><wbr></wbr> NOW()<wbr></wbr><wbr></wbr> 　<wbr></wbr><wbr></wbr> SYSDATE()<wbr></wbr><wbr></wbr> 　<wbr></wbr><wbr></wbr> CURRENT_TIMESTAMP<wbr></wbr><wbr></wbr> 以'YYYY-MM-DD<wbr></wbr>HH:MM:SS'或YYYYMMDDHHMMSS格式返回当前的日期和时间，取决于函数是在一个字符串还是在数字的<wbr></wbr> 上下文被使用。<wbr></wbr><wbr></wbr> mysql><wbr></wbr>select<wbr></wbr>NOW();<wbr></wbr><wbr></wbr> -><wbr></wbr>'1997-12-15<wbr></wbr>23:50:26'<wbr></wbr><wbr></wbr> mysql><wbr></wbr>select<wbr></wbr>NOW()<wbr></wbr>+<wbr></wbr>0;<wbr></wbr><wbr></wbr> -><wbr></wbr>19971215235026<wbr></wbr><wbr></wbr> UNIX_TIMESTAMP()<wbr></wbr><wbr></wbr> 　<wbr></wbr><wbr></wbr> UNIX_TIMESTAMP(date)<wbr></wbr><wbr></wbr> 如果没有参数调用，返回一个Unix时间戳记(从'1970-01-01<wbr></wbr>00:00:00'GMT开始的秒数)。如果UNIX_TIMESTAMP()用一<wbr></wbr> 个date参数被调用，它返回从'1970-01-01<wbr></wbr>00:00:00'<wbr></wbr>GMT开始的秒数值。date可以是一个DATE字符串、一个DATETIME<wbr></wbr> 字符串、一个TIMESTAMP或以YYMMDD或YYYYMMDD格式的本地时间的一个数字。<wbr></wbr><wbr></wbr> mysql><wbr></wbr>select<wbr></wbr>UNIX_TIMESTAMP();<wbr></wbr><wbr></wbr> -><wbr></wbr>882226357<wbr></wbr><wbr></wbr> mysql><wbr></wbr>select<wbr></wbr>UNIX_TIMESTAMP('1997-10-04<wbr></wbr>22:23:00');<wbr></wbr><wbr></wbr> -><wbr></wbr>875996580<wbr></wbr><wbr></wbr> 当UNIX_TIMESTAMP被用于一个TIMESTAMP列，函数将直接接受值，没有隐含的“string-to-unix-timestamp”变换。<wbr></wbr><wbr></wbr> FROM_UNIXTIME(unix_timestamp)<wbr></wbr><wbr></wbr> 以'YYYY-MM-DD<wbr></wbr>HH:MM:SS'或YYYYMMDDHHMMSS格式返回unix_timestamp参数所表示的值，取决于函数是在一个字符串<wbr></wbr> 还是或数字上下文中被使用。<wbr></wbr><wbr></wbr> mysql><wbr></wbr>select<wbr></wbr>FROM_UNIXTIME(875996580);<wbr></wbr><wbr></wbr> -><wbr></wbr>'1997-10-04<wbr></wbr>22:23:00'<wbr></wbr><wbr></wbr> mysql><wbr></wbr>select<wbr></wbr>FROM_UNIXTIME(875996580)<wbr></wbr>+<wbr></wbr>0;<wbr></wbr><wbr></wbr> -><wbr></wbr>19971004222300<wbr></wbr><wbr></wbr> FROM_UNIXTIME(unix_timestamp,format)<wbr></wbr><wbr></wbr> 返回表示<wbr></wbr>Unix<wbr></wbr>时间标记的一个字符串，根据format字符串格式化。format可以包含与DATE_FORMAT()函数列出的条<wbr></wbr> 目同样的修饰符。<wbr></wbr><wbr></wbr> mysql><wbr></wbr>select<wbr></wbr>FROM_UNIXTIME(UNIX_TIMESTAMP(),<wbr></wbr><wbr></wbr> '%Y<wbr></wbr>%D<wbr></wbr>%M<wbr></wbr>%h:%i:%s<wbr></wbr>%x');<wbr></wbr><wbr></wbr> -><wbr></wbr>'1997<wbr></wbr>23rd<wbr></wbr>December<wbr></wbr>03:43:30<wbr></wbr>x'<wbr></wbr><wbr></wbr> SEC_TO_TIME(seconds)<wbr></wbr><wbr></wbr> 返回seconds参数，变换成小时、分钟和秒，值以'HH:MM:SS'或HHMMSS格式化，取决于函数是在一个字符串还是在数字<wbr></wbr> 上下文中被使用。<wbr></wbr><wbr></wbr> mysql><wbr></wbr>select<wbr></wbr>SEC_TO_TIME(2378);<wbr></wbr><wbr></wbr> -><wbr></wbr>'00:39:38'<wbr></wbr><wbr></wbr> mysql><wbr></wbr>select<wbr></wbr>SEC_TO_TIME(2378)<wbr></wbr>+<wbr></wbr>0;<wbr></wbr><wbr></wbr> -><wbr></wbr>3938<wbr></wbr><wbr></wbr> TIME_TO_SEC(time)<wbr></wbr><wbr></wbr> 返回time参数，转换成秒。<wbr></wbr><wbr></wbr> mysql><wbr></wbr>select<wbr></wbr>TIME_TO_SEC('22:23:00');<wbr></wbr><wbr></wbr> -><wbr></wbr>80580<wbr></wbr><wbr></wbr> mysql><wbr></wbr>select<wbr></wbr>TIME_TO_SEC('00:39:38');<wbr></wbr><wbr></wbr> -><wbr></wbr>2378<wbr></wbr>