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MYSQL 获取当前日期及日期格?br /> 获取pȝ日期Q?NOW()
格式化日期： DATE_FORMAT(date, format)
注： dateQ时间字D?br />formatQ日期格?/p>

q回pȝ日期,输出 2009-12-25 14:38:59
select now();
输出 09-12-25
select date_format(now(),'%y-%m-%d');

Ҏformat字符串格式化date?

%S, %s 两位数字形式的秒Q?00,01, ..., 59Q?br />%I, %i 两位数字形式的分Q?00,01, ..., 59Q?br />%H 两位数字形式的小Ӟ24 时Q?0,01, ..., 23Q?br />%h 两位数字形式的小Ӟ12 时Q?1,02, ..., 12Q?br />%k 数字形式的小Ӟ24 时Q?,1, ..., 23Q?br />%l 数字形式的小Ӟ12 时Q?, 2, ..., 12Q?br />%T 24 时的时间Ş式（hh:mm:ssQ?br />%r 12 时的时间Ş式（hh:mm:ss AM 或hh:mm:ss PMQ?br />%p AM或PM
%W 一周中每一天的名称QSunday, Monday, ..., SaturdayQ?br />%a 一周中每一天名U的~写QSun, Mon, ..., SatQ?br />%d 两位数字表示月中的天敎ͼ00, 01,..., 31Q?br />%e 数字形式表示月中的天敎ͼ1, 2Q?..., 31Q?br />%D 英文后缀表示月中的天敎ͼ1st, 2nd, 3rd,...Q?br />%w 以数字Ş式表C周中的天数Q?0 = Sunday, 1=Monday, ..., 6=SaturdayQ?br />%j 以三位数字表C年中的天数Q?001, 002, ..., 366Q?br />%U 周（0, 1, 52Q，其中Sunday 为周中的W一?br />%u 周（0, 1, 52Q，其中Monday 为周中的W一?br />%M 月名QJanuary, February, ..., DecemberQ?br />%b ~写的月名（ January, February,...., DecemberQ?br />%m 两位数字表示的月份（01, 02, ..., 12Q?br />%c 数字表示的月份（1, 2, ...., 12Q?br />%Y 四位数字表示的年?br />%y 两位数字表示的年?br />%% 直接?#8220;%”

 

 

curdateQ）

 

MySQL 获得当前日期旉 函数
1.1 获得当前日期+旉Qdate + timeQ函敎ͼnow()

mysql> select now();

+---------------------+
| now() |
+---------------------+
| 2008-08-08 22:20:46 |
+---------------------+
除了 now() 函数能获得当前的日期旉外，MySQL 中还有下面的函数Q?br />
current_timestamp()
,current_timestamp
,localtime()
,localtime
,localtimestamp -- (v4.0.6)
,localtimestamp() -- (v4.0.6)
q些日期旉函数Q都{同?now()。鉴?now() 函数短易讎ͼL使用 now() 来替代上面列出的函数?br />
1.2 获得当前日期+旉Qdate + timeQ函敎ͼsysdate()

sysdate() 日期旉函数?now() cMQ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倹{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 |
+---------------------+----------+---------------------+mysql> select sysdate(), sleep(3), sysdate();

+---------------------+----------+---------------------+
| sysdate() | sleep(3) | sysdate() |
+---------------------+----------+---------------------+
| 2008-08-08 22:28:41 | 0 | 2008-08-08 22:28:44 |
+---------------------+----------+---------------------+
可以看到Q虽然中?sleep 3 U，?now() 函数两次的时间值是相同的； sysdate() 函数两次得到的时间值相?3U。MySQL Manual 中是q样描述 sysdate() 的：Return the time at which the functionexecutes?br />
sysdate() 日期旉函数Q一般情况下很少用到?br />
2. 获得当前日期QdateQ函敎ͼcurdate()

mysql> select curdate();

+------------+
| curdate() |
+------------+
| 2008-08-08 |
+------------+
其中Q下面的两个日期函数{同?curdate()Q?br />
current_date()
,current_date
3. 获得当前旉QtimeQ函敎ͼcurtime()

mysql> select curtime();

+-----------+
| curtime() |
+-----------+
| 22:41:30 |
+-----------+
其中Q下面的两个旉函数{同?curtime()Q?br />
current_time()
,current_time
4. 获得当前 UTC 日期旉函数Qutc_date(), utc_time(), utc_timestamp()

mysql> select utc_timestamp(), utc_date(), utc_time(), now()

+---------------------+------------+------------+---------------------+
| utc_timestamp() | utc_date() | utc_time() | now() |
+---------------------+------------+------------+---------------------+
| 2008-08-08 14:47:11 | 2008-08-08 | 14:47:11 | 2008-08-08 22:47:11 |
+---------------------+------------+------------+---------------------+
因ؓ我国位于东八时区Q所以本地时?= UTC 旉 + 8 时。UTC 旉在业务涉及多个国家和地区的时候，非常有用?br />
二、MySQL 日期旉 ExtractQ选取Q?函数?br />1. 选取日期旉的各个部分：日期、时间、年、季度、月、日、小时、分钟、秒、微U?br />
set @dt = '2008-09-10 07:15:30.123456';

select date(@dt); -- 2008-09-10
select time(@dt); -- 07:15:30.123456
select year(@dt); -- 2008
select quarter(@dt); -- 3
select month(@dt); -- 9
select week(@dt); -- 36
select day(@dt); -- 10
select hour(@dt); -- 7
select minute(@dt); -- 15
select second(@dt); -- 30
select microsecond(@dt); -- 123456
2. MySQL Extract() 函数Q可以上面实现类似的功能Q?br />
set @dt = '2008-09-10 07:15:30.123456';

select extract(year from @dt); -- 2008
select extract(quarter from @dt); -- 3
select extract(month from @dt); -- 9
select extract(week from @dt); -- 36
select extract(day from @dt); -- 10
select extract(hour from @dt); -- 7
select extract(minute from @dt); -- 15
select extract(second from @dt); -- 30
select extract(microsecond from @dt); -- 123456select extract(year_month from @dt); -- 200809
select extract(day_hour from @dt); -- 1007
select extract(day_minute from @dt); -- 100715
select extract(day_second from @dt); -- 10071530
select extract(day_microsecond from @dt); -- 10071530123456
select extract(hour_minute from @dt); -- 715
select extract(hour_second from @dt); -- 71530
select extract(hour_microsecond from @dt); -- 71530123456
select extract(minute_second from @dt); -- 1530
select extract(minute_microsecond from @dt); -- 1530123456
select extract(second_microsecond from @dt); -- 30123456
MySQLExtract() 函数除了没有date(),time() 的功能外Q其他功能一应具全。ƈ且还h选取‘day_microsecond’{功能。注意这里不是只选取 day ?microsecondQ而是从日期的 day 部分一直选取?microsecond 部分。够强悍的吧Q?br />
MySQL Extract() 函数唯一不好的地方在于：你需要多敲几ơ键盘?br />
3. MySQL dayof… 函数Qdayofweek(), dayofmonth(), dayofyear()

分别q回日期参数Q在一周、一月、一q中的位|?br />
set @dt = '2008-08-08';

select dayofweek(@dt); -- 6
select dayofmonth(@dt); -- 8
select dayofyear(@dt); -- 221
日期 ‘2008-08-08′ 是一周中的第 6 天（1 = Sunday, 2 = Monday, …, 7 = SaturdayQ；一月中的第 8 天；一q中的第 221 天?br />
4. MySQL week… 函数Qweek(), weekofyear(), dayofweek(), weekday(), yearweek()

set @dt = '2008-08-08';

select week(@dt); -- 31
select week(@dt,3); -- 32
select weekofyear(@dt); -- 32

select dayofweek(@dt); -- 6
select weekday(@dt); -- 4

select yearweek(@dt); -- 200831
MySQL week() 函数Q可以有两个参数Q具体可看手册?weekofyear() ?week() 一P都是计算“某天”是位于一q中的第几周?weekofyear(@dt) {h?week(@dt,3)?br />
MySQLweekday() 函数?dayofweek() cMQ都是返?#8220;某天”在一周中的位|。不同点在于参考的标准Q?weekdayQ?0 =Monday, 1 = Tuesday, …, 6 = Sunday)Q?dayofweekQ（1 = Sunday, 2 = Monday,…, 7 = SaturdayQ?br />
MySQL yearweek() 函数Q返?year(2008) + week 位置(31)?br />
5. MySQL q回星期和月份名U函敎ͼdayname(), monthname()

set @dt = '2008-08-08';

select dayname(@dt); -- Friday
select monthname(@dt); -- August
思考，如何q回中文的名U呢Q?br />
6. MySQL last_day() 函数Q返回月份中的最后一天?br />
select last_day('2008-02-01'); -- 2008-02-29
select last_day('2008-08-08'); -- 2008-08-31
MySQL last_day() 函数非常有用Q比如我惛_到当前月份中有多天Q可以这h计算Q?br />
mysql> select now(), day(last_day(now())) as days;

+---------------------+------+
| now() | days |
+---------------------+------+
| 2008-08-09 11:45:45 | 31 |
+---------------------+------+ 三、MySQL 日期旉计算函数
1. 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Q可以用 date_add() 来替代。下面是 date_add() 实现 addtime() 功能CZQ?br />
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 |
+-------------------------------------------------+
date_add() 函数Q分别ؓ @dt 增加?#8220;1时 15?30U?#8221; ?“1?1时 15?30U?#8221;。徏议：L使用 date_add() 日期旉函数来替?adddate(), addtime()?br />
2. MySQL 为日期减M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() 日期旉函数 ?date_add() 用法一_不再赘述。另外，MySQL 中还有两个函?subdate(), subtime()Q徏议，?date_sub() 来替代?br />
3. MySQL 另类日期函数Qperiod_add(P,N), period_diff(P1,P2)

函数参数“P” 的格式ؓ“YYYYMM” 或?“YYMM”Q第二个参数“N” 表示增加或减?N monthQ月Q?br />
MySQL period_add(P,N)Q日期加/减去N月?br />
mysql> select period_add(200808,2), period_add(20080808,-2)

+----------------------+-------------------------+
| period_add(200808,2) | period_add(20080808,-2) |
+----------------------+-------------------------+
| 200810 | 20080806 |
+----------------------+-------------------------+
MySQL period_diff(P1,P2)Q日?P1-P2Q返?N 个月?br />
mysql> select period_diff(200808, 200801);

+-----------------------------+
| period_diff(200808, 200801) |
+-----------------------------+
| 7 |
+-----------------------------+
?MySQL 中，q两个日期函敎ͼ一般情况下很少用到?br />
4. MySQL 日期、时间相减函敎ͼdatediff(date1,date2), timediff(time1,time2)

MySQL datediff(date1,date2)Q两个日期相?date1 - date2Q返回天数?br />
select datediff('2008-08-08', '2008-08-01'); -- 7
select datediff('2008-08-01', '2008-08-08'); -- -7
MySQL timediff(time1,time2)Q两个日期相?time1 - time2Q返?time 差倹{?br />
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Qtimediff(time1,time2) 函数的两个参数类型必ȝ同?br />
四、MySQL 日期转换函数、时间{换函?br />1. MySQL Q时间、秒Q{换函敎ͼtime_to_sec(time), sec_to_time(seconds)

select time_to_sec('01:00:05'); -- 3605
select sec_to_time(3605); -- '01:00:05'
2. MySQL Q日期、天敎ͼ转换函数Qto_days(date), from_days(days)

select to_days('0000-00-00'); -- 0
select to_days('2008-08-08'); -- 733627select from_days(0); -- '0000-00-00'
select from_days(733627); -- '2008-08-08'
3. MySQL Str to Date Q字W串转换为日期）函数Qstr_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Qstr_to_date(str,format) 转换函数Q可以把一些杂乱无章的字符串{换ؓ日期格式。另外，它也可以转换为时间?#8220;format” 可以参看 MySQL 手册?br />
4. MySQL Date/Time to StrQ日?旉转换为字W串Q函敎ͼdate_format(date,format), time_format(time,format)

mysql> select date_format('2008-08-08 22:23:00', '%W %M %Y');

+------------------------------------------------+
| date_format('2008-08-08 22:23:00', '%W %M %Y') |
+------------------------------------------------+
| Friday August 2008 |
+------------------------------------------------+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> select time_format('22:23:01', '%H.%i.%s');

+-------------------------------------+
| time_format('22:23:01', '%H.%i.%s') |
+-------------------------------------+
| 22.23.01 |
+-------------------------------------+
MySQL 日期、时间{换函敎ͼdate_format(date,format), time_format(time,format) 能够把一个日?旉转换成各U各L字符串格式。它?str_to_date(str,format) 函数?一个逆{换?br />
5. MySQL 获得国家地区旉格式函数Qget_format()

MySQL get_format() 语法Q?br />
get_format(date|time|datetime, 'eur'|'usa'|'jis'|'iso'|'internal'
MySQL get_format() 用法的全部示例：

select get_format(date,'usa') ; -- '%m.%d.%Y'
select get_format(date,'jis') ; -- '%Y-%m-%d'
select get_format(date,'iso') ; -- '%Y-%m-%d'
select get_format(date,'eur') ; -- '%d.%m.%Y'
select get_format(date,'internal') ; -- '%Y%m%d'
select get_format(datetime,'usa') ; -- '%Y-%m-%d %H.%i.%s'
select get_format(datetime,'jis') ; -- '%Y-%m-%d %H:%i:%s'
select get_format(datetime,'iso') ; -- '%Y-%m-%d %H:%i:%s'
select get_format(datetime,'eur') ; -- '%Y-%m-%d %H.%i.%s'
select get_format(datetime,'internal') ; -- '%Y%m%d%H%i%s'
select get_format(time,'usa') ; -- '%h:%i:%s %p'
select get_format(time,'jis') ; -- '%H:%i:%s'
select get_format(time,'iso') ; -- '%H:%i:%s'
select get_format(time,'eur') ; -- '%H.%i.%s'
select get_format(time,'internal') ; -- '%H%i%s'
MySQL get_format() 函数在实际中用到Z的比较少?br />
6. MySQL 拼凑日期、时间函敎ͼmakdedate(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' 五、MySQL 旉戻ITimestampQ函?br />1. MySQL 获得当前旉戛_敎ͼcurrent_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 |
+---------------------+---------------------+
2. MySQL QUnix 旉戟뀁日期）转换函数Q?br />
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'); -- 1218169800select from_unixtime(1218290027); -- '2008-08-09 21:53:47'
select from_unixtime(1218124800); -- '2008-08-08 00:00:00'
selectfrom_unixtime(1218169800); -- '2008-08-08 12:30:00'selectfrom_unixtime(1218169800, '%Y %D %M %h:%i:%s %x'); -- '2008 8th August12:30:00 2008'
3. MySQL 旉戻ItimestampQ{换、增、减函数Q?br />
timestamp(date) -- date to timestamp
timestamp(dt,time) -- dt + time
timestampadd(unit,interval,datetime_expr) --
timestampdiff(unit,datetime_expr1,datetime_expr2) --
LCZ部分Q?br />
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
selecttimestamp('2008-08-08 08:00:00', '10 01:01:01'); -- 2008-08-1809:01:01select 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cM?date_add()?br />
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() 函数比 datediff() 功能强多了，datediff() 只能计算两个日期QdateQ之间相差的天数?br />
六、MySQL 时区QtimezoneQ{换函数convert_tz(dt,from_tz,to_tz)selectconvert_tz('2008-08-08 12:00:00', '+08:00', '+00:00'); -- 2008-08-0804:00:00
时区转换也可以通过 date_add, date_sub, timestampadd 来实现?br />
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



xzc 2016-03-30 10:33 发表评论
]]>MySQL 获得当前日期旉 函数http://www.aygfsteel.com/xzclog/archive/2016/02/22/429391.htmlxzcxzcMon, 22 Feb 2016 06:46:00 GMThttp://www.aygfsteel.com/xzclog/archive/2016/02/22/429391.htmlhttp://www.aygfsteel.com/xzclog/comments/429391.htmlhttp://www.aygfsteel.com/xzclog/archive/2016/02/22/429391.html#Feedback1http://www.aygfsteel.com/xzclog/comments/commentRss/429391.htmlhttp://www.aygfsteel.com/xzclog/services/trackbacks/429391.html

获得当前日期+旉Qdate + timeQ函敎ͼnow()

复制代码
mysql> select now();  +---------------------+ | now() | +---------------------+ | 2008-08-08 22:20:46 | +---------------------+
复制代码

获得当前日期+旉Qdate + timeQ函敎ͼsysdate()
sysdate() 日期旉函数?now() cMQ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倹{看下面的例子就明白了：

复制代码
mysql> select now(), sleep(3), now();  +---------------------+----------+---------------------+ | now() | sleep(3) | now() | +---------------------+----------+---------------------+ | 2008-08-08 22:28:21 | 0 | 2008-08-08 22:28:21 | +---------------------+----------+---------------------+
复制代码

sysdate() 日期旉函数Q一般情况下很少用到?/p>

 

MySQL 获得当前旉戛_敎ͼcurrent_timestamp, current_timestamp()

复制代码
mysql> select current_timestamp, current_timestamp();  +---------------------+---------------------+ | current_timestamp | current_timestamp() | +---------------------+---------------------+ | 2008-08-09 23:22:24 | 2008-08-09 23:22:24 | +---------------------+---------------------+
复制代码

 

MySQL 日期转换函数、时间{换函?/span>

MySQL Date/Time to StrQ日?旉转换为字W串Q函敎ͼdate_format(date,format), time_format(time,format)

复制代码
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 | +----------------------------------------------------+
复制代码

MySQL 日期、时间{换函敎ͼdate_format(date,format), time_format(time,format) 能够把一个日?旉转换成各U各L字符串格式。它?str_to_date(str,format) 函数?一个逆{换?/p>

 

MySQL Str to Date Q字W串转换为日期）函数Qstr_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Qstr_to_date(str,format) 转换函数Q可以把一些杂乱无章的字符串{换ؓ日期格式。另外，它也可以转换为时间?#8220;format” 可以参看 MySQL 手册?/span>

 

MySQL Q日期、天敎ͼ转换函数Qto_days(date), from_days(days)

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

 

MySQL Q时间、秒Q{换函敎ͼtime_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、时间函敎ͼmakdedate(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 QUnix 旉戟뀁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：

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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'
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MySQL 日期旉计算函数

 

MySQL 为日期增加一个时间间隔：date_add()

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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
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MySQL adddate(), addtime()函数Q可以用 date_add() 来替代。下面是 date_add() 实现 addtime() 功能CZQ?br />

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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 | +-------------------------------------------------+
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MySQL 为日期减M个时间间隔：date_sub()

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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 | +----------------------------------------------------------------+
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MySQL date_sub() 日期旉函数 ?date_add() 用法一_不再赘述?/span>

 

MySQL 日期、时间相减函敎ͼdatediff(date1,date2), timediff(time1,time2)

MySQL datediff(date1,date2)Q两个日期相?date1 - date2Q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)Q两个日期相?time1 - time2Q返?time 差倹{?br />

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Qtimediff(time1,time2) 函数的两个参数类型必ȝ同?/span>

 

MySQL 旉戻ItimestampQ{换、增、减函数Q?/p>

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

LCZ部分Q?/p>

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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cM?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
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MySQL timestampdiff() 函数比 datediff() 功能强多了，datediff() 只能计算两个日期QdateQ之间相差的天数?/p>

 

MySQL 时区QtimezoneQ{换函?/span>

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?br />

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

 

更多参?nbsp;http://www.cnblogs.com/she27/archive/2009/01/16/1377089.html



xzc 2016-02-22 14:46 发表评论
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