mysql中格式化日期详解

MySQL 获得当前日期时间函数

获得当前日期+时间（date + time）函数：now()

mysql> select now();

+---------------------+
| now() |
+---------------------+
| 2008-08-08 22:20:46 |
+---------------------+

获得当前日期+时间（date + time）函数：sysdate()
sysdate() 日期时间函数跟 now() 类似，不同之处在于：now() 在执行开始时值就得到了， sysdate() 在函数执行时动态得到值。看下面的例子就明白了：

mysql> select now(), sleep(3), now();

+---------------------+----------+---------------------+
| now() | sleep(3) | now() |
+---------------------+----------+---------------------+
| 2008-08-08 22:28:21 | 0 | 2008-08-08 22:28:21 |
+---------------------+----------+---------------------+

sysdate() 日期时间函数，一般情况下很少用到。

MySQL 获得当前时间戳函数：current_timestamp, current_timestamp()

mysql> select current_timestamp, current_timestamp();

+---------------------+---------------------+
| current_timestamp | current_timestamp() |
+---------------------+---------------------+
| 2008-08-09 23:22:24 | 2008-08-09 23:22:24 |
+---------------------+---------------------+

MySQL 日期转换函数、时间转换函数

MySQL Date/Time to Str（日期/时间转换为字符串）函数：date_format(date,format), time_format(time,format)

mysql> select date_format(\'2008-08-08 22:23:01\', \'%Y%m%d%H%i%s\');

+----------------------------------------------------+
| date_format(\'2008-08-08 22:23:01\', \'%Y%m%d%H%i%s\') |
+----------------------------------------------------+
| 20080808222301 |
+----------------------------------------------------+

MySQL 日期、时间转换函数：date_format(date,format), time_format(time,format) 能够把一个日期/时间转换成各种各样的字符串格式。它是 str_to_date(str,format) 函数的一个逆转换。

MySQL Str to Date （字符串转换为日期）函数：str_to_date(str, format)

select str_to_date(\'08/09/2008\', \'%m/%d/%Y\'); -- 2008-08-09
select str_to_date(\'08/09/08\' , \'%m/%d/%y\'); -- 2008-08-09
select str_to_date(\'08.09.2008\', \'%m.%d.%Y\'); -- 2008-08-09
select str_to_date(\'08:09:30\', \'%h:%i:%s\'); -- 08:09:30
select str_to_date(\'08.09.2008 08:09:30\', \'%m.%d.%Y %h:%i:%s\'); -- 2008-08-09 08:09:30

可以看到，str_to_date(str,format) 转换函数，可以把一些杂乱无章的字符串转换为日期格式。另外，它也可以转换为时间。“format” 可以参看 MySQL 手册。

MySQL （日期、天数）转换函数：to_days(date), from_days(days)

select to_days(\'0000-00-00\'); -- 0
select to_days(\'2008-08-08\'); -- 733627

MySQL （时间、秒）转换函数：time_to_sec(time), sec_to_time(seconds)

select time_to_sec(\'01:00:05\'); -- 3605
select sec_to_time(3605); -- \'01:00:05\'

MySQL 拼凑日期、时间函数：makdedate(year,dayofyear), maketime(hour,minute,second)

select makedate(2001,31); -- \'2001-01-31\'
select makedate(2001,32); -- \'2001-02-01\'
select maketime(12,15,30); -- \'12:15:30\'

MySQL （Unix 时间戳、日期）转换函数

unix_timestamp(),
unix_timestamp(date),
from_unixtime(unix_timestamp),
from_unixtime(unix_timestamp,format)

下面是示例：

select unix_timestamp(); -- 1218290027
select unix_timestamp(\'2008-08-08\'); -- 1218124800
select unix_timestamp(\'2008-08-08 12:30:00\'); -- 1218169800

select from_unixtime(1218290027); -- \'2008-08-09 21:53:47\'
select from_unixtime(1218124800); -- \'2008-08-08 00:00:00\'
select from_unixtime(1218169800); -- \'2008-08-08 12:30:00\'

select from_unixtime(1218169800, \'%Y %D %M %h:%i:%s %x\'); -- \'2008 8th August 12:30:00 2008\'

MySQL 日期时间计算函数

MySQL 为日期增加一个时间间隔：date_add()

set @dt = now();

select date_add(@dt, interval 1 day); -- add 1 day
select date_add(@dt, interval 1 hour); -- add 1 hour
select date_add(@dt, interval 1 minute); -- ...
select date_add(@dt, interval 1 second);
select date_add(@dt, interval 1 microsecond);
select date_add(@dt, interval 1 week);
select date_add(@dt, interval 1 month);
select date_add(@dt, interval 1 quarter);
select date_add(@dt, interval 1 year);

select date_add(@dt, interval -1 day); -- sub 1 day

MySQL adddate(), addtime()函数，可以用 date_add() 来替代。下面是 date_add() 实现 addtime() 功能示例：

mysql> set @dt = \'2008-08-09 12:12:33\';

mysql>
mysql> select date_add(@dt, interval \'01:15:30\' hour_second);

+------------------------------------------------+
| date_add(@dt, interval \'01:15:30\' hour_second) |
+------------------------------------------------+
| 2008-08-09 13:28:03 |
+------------------------------------------------+

mysql> select date_add(@dt, interval \'1 01:15:30\' day_second);

+-------------------------------------------------+
| date_add(@dt, interval \'1 01:15:30\' day_second) |
+-------------------------------------------------+
| 2008-08-10 13:28:03 |
+-------------------------------------------------+

MySQL 为日期减去一个时间间隔：date_sub()

mysql> select date_sub(\'1998-01-01 00:00:00\', interval \'1 1:1:1\' day_second);

+----------------------------------------------------------------+
| date_sub(\'1998-01-01 00:00:00\', interval \'1 1:1:1\' day_second) |
+----------------------------------------------------------------+
| 1997-12-30 22:58:59 |
+----------------------------------------------------------------+

MySQL date_sub() 日期时间函数和 date_add() 用法一致，不再赘述。

MySQL 日期、时间相减函数：datediff(date1,date2), timediff(time1,time2)

MySQL datediff(date1,date2)：两个日期相减 date1 - date2，返回天数。
select datediff(\'2008-08-08\', \'2008-08-01\'); -- 7
select datediff(\'2008-08-01\', \'2008-08-08\'); -- -7

MySQL timediff(time1,time2)：两个日期相减 time1 - time2，返回 time 差值。

select timediff(\'2008-08-08 08:08:08\', \'2008-08-08 00:00:00\'); -- 08:08:08
select timediff(\'08:08:08\', \'00:00:00\'); -- 08:08:08

注意：timediff(time1,time2) 函数的两个参数类型必须相同。

MySQL 时间戳（timestamp）转换、增、减函数：

timestamp(date) -- date to timestamp
timestamp(dt,time) -- dt + time
timestampadd(unit,interval,datetime_expr) --
timestampdiff(unit,datetime_expr1,datetime_expr2) --

请看示例部分：

select timestamp(\'2008-08-08\'); -- 2008-08-08 00:00:00
select timestamp(\'2008-08-08 08:00:00\', \'01:01:01\'); -- 2008-08-08 09:01:01
select timestamp(\'2008-08-08 08:00:00\', \'10 01:01:01\'); -- 2008-08-18 09:01:01

select timestampadd(day, 1, \'2008-08-08 08:00:00\'); -- 2008-08-09 08:00:00
select date_add(\'2008-08-08 08:00:00\', interval 1 day); -- 2008-08-09 08:00:00

MySQL timestampadd() 函数类似于 date_add()。
select timestampdiff(year,\'2002-05-01\',\'2001-01-01\'); -- -1
select timestampdiff(day ,\'2002-05-01\',\'2001-01-01\'); -- -485
select timestampdiff(hour,\'2008-08-08 12:00:00\',\'2008-08-08 00:00:00\'); -- -12

select datediff(\'2008-08-08 12:00:00\', \'2008-08-01 00:00:00\'); -- 7

MySQL timestampdiff() 函数就比 datediff() 功能强多了，datediff() 只能计算两个日期（date）之间相差的天数。

MySQL 时区（timezone）转换函数

convert_tz(dt,from_tz,to_tz)

select convert_tz(\'2008-08-08 12:00:00\', \'+08:00\', \'+00:00\'); -- 2008-08-08 04:00:00

时区转换也可以通过 date_add, date_sub, timestampadd 来实现。

select date_add(\'2008-08-08 12:00:00\', interval -8 hour); -- 2008-08-08 04:00:00
select date_sub(\'2008-08-08 12:00:00\', interval 8 hour); -- 2008-08-08 04:00:00
select timestampadd(hour, -8, \'2008-08-08 12:00:00\'); -- 2008-08-08 04:00:00

DATE_FORMAT(date,format)

format参数的格式有

%a	缩写星期名
%b	缩写月名
%c	月，数值
%D	带有英文前缀的月中的天
%d	月的天，数值(00-31)
%e	月的天，数值(0-31)
%f	微秒
%H	小时 (00-23)
%h	小时 (01-12)
%I	小时 (01-12)
%i	分钟，数值(00-59)
%j	年的天 (001-366)
%k	小时 (0-23)
%l	小时 (1-12)
%M	月名
%m	月，数值(00-12)
%p	AM 或 PM
%r	时间，12-小时（hh:mm:ss AM 或 PM）
%S	秒(00-59)
%s	秒(00-59)
%T	时间, 24-小时 (hh:mm:ss)
%U	周 (00-53) 星期日是一周的第一天
%u	周 (00-53) 星期一是一周的第一天
%V	周 (01-53) 星期日是一周的第一天，与 %X 使用
%v	周 (01-53) 星期一是一周的第一天，与 %x 使用
%W	星期名
%w	周的天（0=星期日, 6=星期六）
%X	年，其中的星期日是周的第一天，4 位，与 %V 使用
%x	年，其中的星期一是周的第一天，4 位，与 %v 使用
%Y	年，4 位
%y	年，2 位

例子：

DATE_FORMAT(NOW(),\'%b %d %Y %h:%i %p\') 

DATE_FORMAT(NOW(),\'%m-%d-%Y\') 

DATE_FORMAT(NOW(),\'%d %b %y\') 

DATE_FORMAT(NOW(),\'%d %b %Y %T:%f\')

输出结果：

Dec 29 2008 11:45 PM 
12-29-2008 
29 Dec 08 
29 Dec 2008 16:25:46

2. MySQL 格式化函数 FROM_UNIXTIME()

SELECT FROM_UNIXTIME(date, \'%Y-%c-%d %h:%i:%s\' ) as post_date , 

date_format(NOW(), \'%Y-%c-%d %h:%i:%s\' ) as post_date_gmt 

FROM `article` where outkey = \'Y\'

1、FROM_UNIXTIME( unix_timestamp )

参数：一般为10位的时间戳，如:1417363200

返回值：有两种，可能是类似 \'YYYY-MM-DD HH:MM:SS\' 这样的字符串，也有可能是类似于 YYYYMMDDHHMMSS.uuuuuu 这样的数字，具体返回什么取决于该函数被调用的形式。

mysql> select FROM_UNIXTIME(1344887103); 

+---------------------------+ 
| FROM_UNIXTIME(1344887103) | 

+---------------------------+ 
| 2012-08-14 03:45:03  | 

+---------------------------+ 

1 row in set (0.00 sec)

2、FROM_UNIXTIME( unix_timestamp ，format )

参数 unix_timestamp ：与方法 FROM_UNIXTIME( unix_timestamp ) 中的参数含义一样；

参数 format : 转换之后的时间字符串显示的格式;

返回值：按照指定的时间格式显示的字符串；

mysql> select FROM_UNIXTIME(1344887103,\'%Y-%M-%D %h:%i:%s\'); 

+-----------------------------------------------+ 

| FROM_UNIXTIME(1344887103,\'%Y-%M-%D %h:%i:%s\') | 

+-----------------------------------------------+ 
| 2012-August-14th 03:45:03      | 

+-----------------------------------------------+ 

1 row in set (0.00 sec) 

mysql> select FROM_UNIXTIME(1344887103,\'%Y-%m-%D %h:%i:%s\'); 

+-----------------------------------------------+ 

| FROM_UNIXTIME(1344887103,\'%Y-%m-%D %h:%i:%s\') | 

+-----------------------------------------------+ 
| 2012-08-14th 03:45:03       | 

+-----------------------------------------------+ 

1 row in set (0.00 sec)

3、判断是不是同一天：

SELECT tbl_gamedata.GameMapName,tbl_playerdata.GameMode, tbl_gamedata.MatchMode, tbl_playerdata.GameResult, SUM(tbl_playerdata.GameIsWin) AS tday_winCount, 

   SUM(tbl_playerdata.AssistCount) AS tday_assistCount,SUM(tbl_playerdata.KillCount) AS tday_killCount,

   SUM(tbl_player_title.ThreeKill) AS tday_threeKill,SUM(tbl_player_title.FourKill) AS tday_fourKill,SUM(tbl_player_title.FiveKill) AS tday_fiveKill

 FROM tbl_playerdata 

  LEFT JOIN tbl_gamedata ON tbl_playerdata.GameID = tbl_gamedata.GameID

  LEFT JOIN tbl_player_title ON tbl_player_title.GameID = tbl_playerdata.GameID AND tbl_player_title.PlayerID = tbl_playerdata.PlayerID

 WHERE tbl_playerdata.PlayerID = user_id AND (tbl_playerdata.GameResult = 2 OR tbl_playerdata.GameResult = 3) AND TO_DAYS(FROM_UNIXTIME(tbl_playerdata.GameStartTime)) = TO_DAYS(NOW()) 

 GROUP BY tbl_gamedata.GameMapName, tbl_playerdata.GameMode,tbl_gamedata.MatchMode,tbl_playerdata.GameResult;

其中TO_DAYS(FROM_UNIXTIME(tbl_playerdata.GameStartTime)) = TO_DAYS(NOW()) 就是我们需要的判断

<div class="postBody"> <div id="likecs_post_body" class="blogpost-body blogpost-body-html"><h2> <strong>MySQL 获得当前日期时间函数</strong></h2><p>获得当前日期+时间（date + time）函数：now()</p><div><div><a title="复制代码"><img title="MySQL <wbr>获得当前日期时间 <wbr>函数" src="https://common.cnblogs.com/images/copycode.gif" alt="复制代码"></a></div><pre>mysql> select now();
+---------------------+| now() |+---------------------+| 2008-08-08 22:20:46 |+---------------------+</pre><div><a title="复制代码"><img title="MySQL <wbr>获得当前日期时间 <wbr>函数" src="https://common.cnblogs.com/images/copycode.gif" alt="复制代码"></a></div></div><p>获得当前日期+时间（date + time）函数：sysdate()<br>sysdate() 日期时间函数跟 now() 类似，不同之处在于：now() 在执行开始时值就得到了， sysdate() 在函数执行时动态得到值。看下面的例子就明白了：</p><div><div><a title="复制代码"><img title="MySQL <wbr>获得当前日期时间 <wbr>函数" src="https://common.cnblogs.com/images/copycode.gif" alt="复制代码"></a></div><pre>mysql> select now(), sleep(3), now();
+---------------------+----------+---------------------+| now() | sleep(3) | now() |+---------------------+----------+---------------------+| 2008-08-08 22:28:21 | 0 | 2008-08-08 22:28:21 |+---------------------+----------+---------------------+</pre><div><a title="复制代码"><img title="MySQL <wbr>获得当前日期时间 <wbr>函数" src="https://common.cnblogs.com/images/copycode.gif" alt="复制代码"></a></div></div><p>sysdate() 日期时间函数，一般情况下很少用到。</p><p> </p><p>MySQL 获得当前时间戳函数：current_timestamp, current_timestamp()</p><div><div><a title="复制代码"><img title="MySQL <wbr>获得当前日期时间 <wbr>函数" src="https://common.cnblogs.com/images/copycode.gif" alt="复制代码"></a></div><pre>mysql> select current_timestamp, current_timestamp();
+---------------------+---------------------+| current_timestamp | current_timestamp() |+---------------------+---------------------+| 2008-08-09 23:22:24 | 2008-08-09 23:22:24 |+---------------------+---------------------+</pre><div><a title="复制代码"><img title="MySQL <wbr>获得当前日期时间 <wbr>函数" src="https://common.cnblogs.com/images/copycode.gif" alt="复制代码"></a></div></div><h2> </h2><h2><strong>MySQL 日期转换函数、时间转换函数</strong></h2><p>MySQL Date/Time to Str（日期/时间转换为字符串）函数：date_format(date,format), time_format(time,format)</p><div><div><a title="复制代码"><img title="MySQL <wbr>获得当前日期时间 <wbr>函数" src="https://common.cnblogs.com/images/copycode.gif" alt="复制代码"></a></div><pre>mysql> select date_format(\'2008-08-08 22:23:01\', \'%Y%m%d%H%i%s\');
+----------------------------------------------------+| date_format(\'2008-08-08 22:23:01\', \'%Y%m%d%H%i%s\') |+----------------------------------------------------+| 20080808222301 |+----------------------------------------------------+</pre><div><a title="复制代码"><img title="MySQL <wbr>获得当前日期时间 <wbr>函数" src="https://common.cnblogs.com/images/copycode.gif" alt="复制代码"></a></div></div><p>MySQL 日期、时间转换函数：date_format(date,format), time_format(time,format) 能够把一个日期/时间转换成各种各样的字符串格式。它是 str_to_date(str,format) 函数的一个逆转换。</p><p> </p><p>MySQL Str to Date （字符串转换为日期）函数：str_to_date(str, format)</p><div><pre>select str_to_date(\'08/09/2008\', \'%m/%d/%Y\'); -- 2008-08-09select str_to_date(\'08/09/08\' , \'%m/%d/%y\'); -- 2008-08-09select str_to_date(\'08.09.2008\', \'%m.%d.%Y\'); -- 2008-08-09select str_to_date(\'08:09:30\', \'%h:%i:%s\'); -- 08:09:30select str_to_date(\'08.09.2008 08:09:30\', \'%m.%d.%Y %h:%i:%s\'); -- 2008-08-09 08:09:30</pre></div><p>可以看到，str_to_date(str,format) 转换函数，可以把一些杂乱无章的字符串转换为日期格式。另外，它也可以转换为时间。“format” 可以参看 MySQL 手册。</p><p> </p><p>MySQL （日期、天数）转换函数：to_days(date), from_days(days)</p><div><pre>select to_days(\'0000-00-00\'); -- 0select to_days(\'2008-08-08\'); -- 733627</pre></div><p> </p><p>MySQL （时间、秒）转换函数：time_to_sec(time), sec_to_time(seconds)</p><div><pre>select time_to_sec(\'01:00:05\'); -- 3605select sec_to_time(3605); -- \'01:00:05\'</pre></div><p> </p><p>MySQL 拼凑日期、时间函数：makdedate(year,dayofyear), maketime(hour,minute,second)</p><div><pre>select makedate(2001,31); -- \'2001-01-31\'select makedate(2001,32); -- \'2001-02-01\'select maketime(12,15,30); -- \'12:15:30\'</pre></div><p> </p><p>MySQL （Unix 时间戳、日期）转换函数</p><div><pre>unix_timestamp(),unix_timestamp(date),from_unixtime(unix_timestamp),from_unixtime(unix_timestamp,format)</pre></div><p><br>下面是示例：</p><div><div><a title="复制代码"><img title="MySQL <wbr>获得当前日期时间 <wbr>函数" src="https://common.cnblogs.com/images/copycode.gif" alt="复制代码"></a></div><pre>select unix_timestamp(); -- 1218290027select unix_timestamp(\'2008-08-08\'); -- 1218124800select unix_timestamp(\'2008-08-08 12:30:00\'); -- 1218169800
select from_unixtime(1218290027); -- \'2008-08-09 21:53:47\'select from_unixtime(1218124800); -- \'2008-08-08 00:00:00\'select from_unixtime(1218169800); -- \'2008-08-08 12:30:00\'
select from_unixtime(1218169800, \'%Y %D %M %h:%i:%s %x\'); -- \'2008 8th August 12:30:00 2008\'</pre><div><a title="复制代码"><img title="MySQL <wbr>获得当前日期时间 <wbr>函数" src="https://common.cnblogs.com/images/copycode.gif" alt="复制代码"></a></div></div><p> </p><p> </p><h2><strong>MySQL 日期时间计算函数</strong></h2><p> </p><p>MySQL 为日期增加一个时间间隔：date_add()</p><div><div><a title="复制代码"><img title="MySQL <wbr>获得当前日期时间 <wbr>函数" src="https://common.cnblogs.com/images/copycode.gif" alt="复制代码"></a></div><pre>set @dt = now();
select date_add(@dt, interval 1 day); -- add 1 dayselect date_add(@dt, interval 1 hour); -- add 1 hourselect date_add(@dt, interval 1 minute); -- ...select date_add(@dt, interval 1 second);select date_add(@dt, interval 1 microsecond);select date_add(@dt, interval 1 week);select date_add(@dt, interval 1 month);select date_add(@dt, interval 1 quarter);select date_add(@dt, interval 1 year);
select date_add(@dt, interval -1 day); -- sub 1 day</pre><div><a title="复制代码"><img title="MySQL <wbr>获得当前日期时间 <wbr>函数" src="https://common.cnblogs.com/images/copycode.gif" alt="复制代码"></a></div></div><p> </p><p>MySQL adddate(), addtime()函数，可以用 date_add() 来替代。下面是 date_add() 实现 addtime() 功能示例：</p><div><div><a title="复制代码"><img title="MySQL <wbr>获得当前日期时间 <wbr>函数" src="https://common.cnblogs.com/images/copycode.gif" alt="复制代码"></a></div><pre>mysql> set @dt = \'2008-08-09 12:12:33\';
mysql>mysql> select date_add(@dt, interval \'01:15:30\' hour_second);
+------------------------------------------------+| date_add(@dt, interval \'01:15:30\' hour_second) |+------------------------------------------------+| 2008-08-09 13:28:03 |+------------------------------------------------+
mysql> select date_add(@dt, interval \'1 01:15:30\' day_second);
+-------------------------------------------------+| date_add(@dt, interval \'1 01:15:30\' day_second) |+-------------------------------------------------+| 2008-08-10 13:28:03 |+-------------------------------------------------+</pre><div><a title="复制代码"><img title="MySQL <wbr>获得当前日期时间 <wbr>函数" src="https://common.cnblogs.com/images/copycode.gif" alt="复制代码"></a></div></div><p> </p><p>MySQL 为日期减去一个时间间隔：date_sub()</p><div><div><a title="复制代码"><img title="MySQL <wbr>获得当前日期时间 <wbr>函数" src="https://common.cnblogs.com/images/copycode.gif" alt="复制代码"></a></div><pre>mysql> select date_sub(\'1998-01-01 00:00:00\', interval \'1 1:1:1\' day_second);
+----------------------------------------------------------------+| date_sub(\'1998-01-01 00:00:00\', interval \'1 1:1:1\' day_second) |+----------------------------------------------------------------+| 1997-12-30 22:58:59 |+----------------------------------------------------------------+</pre><div><a title="复制代码"><img title="MySQL <wbr>获得当前日期时间 <wbr>函数" src="https://common.cnblogs.com/images/copycode.gif" alt="复制代码"></a></div></div><p>MySQL date_sub() 日期时间函数和 date_add() 用法一致，不再赘述。</p><p> </p><p>MySQL 日期、时间相减函数：datediff(date1,date2), timediff(time1,time2)</p><div><pre>MySQL datediff(date1,date2)：两个日期相减 date1 - date2，返回天数。select datediff(\'2008-08-08\', \'2008-08-01\'); -- 7select datediff(\'2008-08-01\', \'2008-08-08\'); -- -7</pre></div><p>MySQL timediff(time1,time2)：两个日期相减 time1 - time2，返回 time 差值。</p><div><pre>select timediff(\'2008-08-08 08:08:08\', \'2008-08-08 00:00:00\'); -- 08:08:08select timediff(\'08:08:08\', \'00:00:00\'); -- 08:08:08</pre></div><p>注意：timediff(time1,time2) 函数的两个参数类型必须相同。</p><p> </p><p>MySQL 时间戳（timestamp）转换、增、减函数：</p><div><pre>timestamp(date) -- date to timestamptimestamp(dt,time) -- dt + timetimestampadd(unit,interval,datetime_expr) --timestampdiff(unit,datetime_expr1,datetime_expr2) --</pre></div><p>请看示例部分：</p><div><div><a title="复制代码"><img title="MySQL <wbr>获得当前日期时间 <wbr>函数" src="https://common.cnblogs.com/images/copycode.gif" alt="复制代码"></a></div><pre>select timestamp(\'2008-08-08\'); -- 2008-08-08 00:00:00select timestamp(\'2008-08-08 08:00:00\', \'01:01:01\'); -- 2008-08-08 09:01:01select timestamp(\'2008-08-08 08:00:00\', \'10 01:01:01\'); -- 2008-08-18 09:01:01
select timestampadd(day, 1, \'2008-08-08 08:00:00\'); -- 2008-08-09 08:00:00select date_add(\'2008-08-08 08:00:00\', interval 1 day); -- 2008-08-09 08:00:00
MySQL timestampadd() 函数类似于 date_add()。select timestampdiff(year,\'2002-05-01\',\'2001-01-01\'); -- -1select timestampdiff(day ,\'2002-05-01\',\'2001-01-01\'); -- -485select timestampdiff(hour,\'2008-08-08 12:00:00\',\'2008-08-08 00:00:00\'); -- -12
select datediff(\'2008-08-08 12:00:00\', \'2008-08-01 00:00:00\'); -- 7</pre><div><a title="复制代码"><img title="MySQL <wbr>获得当前日期时间 <wbr>函数" src="https://common.cnblogs.com/images/copycode.gif" alt="复制代码"></a></div></div><p>MySQL timestampdiff() 函数就比 datediff() 功能强多了，datediff() 只能计算两个日期（date）之间相差的天数。</p><p> </p><h2><strong>MySQL 时区（timezone）转换函数</strong></h2><div><pre>convert_tz(dt,from_tz,to_tz)
select convert_tz(\'2008-08-08 12:00:00\', \'+08:00\', \'+00:00\'); -- 2008-08-08 04:00:00</pre></div><p>时区转换也可以通过 date_add, date_sub, timestampadd 来实现。</p><div><pre>select date_add(\'2008-08-08 12:00:00\', interval -8 hour); -- 2008-08-08 04:00:00select date_sub(\'2008-08-08 12:00:00\', interval 8 hour); -- 2008-08-08 04:00:00select timestampadd(hour, -8, \'2008-08-08 12:00:00\'); -- 2008-08-08 04:00:00</pre></div></div><div id="MySignature"></div><div class="clear"></div><div id="blog_post_info_block"><div id="BlogPostCategory"> 分类: <a href="https://www.cnblogs.com/php12-cn/category/1167110.html" target="_blank">database</a></div>

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MySQL 获得当前日期时间 函数

MySQL 日期转换函数、时间转换函数

MySQL 日期时间计算函数

MySQL 时区（timezone）转换函数

MySQL 获得当前日期时间函数