mysql 日期时间处理函数

  • ADDDATE(date,interval expr unit),ADDDATE(expr,days) --- 添加时间值(时区)为日期值,其为DATE_ADD()的别名

DATA_ADD(date,INTERVAL expr unit)、DATE_SUB(date,INTERVAL expr unit)

这些函数进行时间运算;date参数指定开始日期的日期或日期时间值,expr是一个表达式指定要添加或减去的值的间隔的开始日期

unit Value Expected expr Format
MICROSECOND MICROSECONDS
SECOND SECONDS
MINUTE MINUTES
HOUR HOURS
DAY DAYS
WEEK WEEKS
MONTH MONTHS
QUARTER QUARTERS
YEAR YEARS
SECOND_MICROSECOND 'SECONDS.MICROSECONDS'
MINUTE_MICROSECOND 'MINUTES:SECONDS.MICROSECONDS'
MINUTE_SECOND 'MINUTES:SECONDS'
HOUR_MICROSECOND 'HOURS:MINUTES:SECONDS.MICROSECONDS'
HOUR_SECOND 'HOURS:MINUTES:SECONDS'
HOUR_MINUTE 'HOURS:MINUTES'
DAY_MICROSECOND 'DAYS HOURS:MINUTES:SECONDS.MICROSECONDS'
DAY_SECOND 'DAYS HOURS:MINUTES:SECONDS'
DAY_MINUTE 'DAYS HOURS:MINUTES'
DAY_HOUR 'DAYS HOURS'
YEAR_MONTH 'YEARS-MONTHS'

 

也可以写作

date + INTERVAL expr unit

date - INTERVAL expr unit

 

mysql> select '2008-1-31' + interval 1 month;

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

| '2008-1-31' + interval 1 month |

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

| 2008-02-29                     |

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

1 row in set (0.00 sec)



mysql> select date_add('2008-1-31',interval 1 month);

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

| date_add('2008-1-31',interval 1 month) |

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

| 2008-02-29                             |

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

1 row in set (0.00 sec)

 

获取一天的开始和最后的时间

mysql> select '2015-4-4 0:0:0' + interval 1 day - interval 1 second;

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

| '2015-4-4 0:0:0' + interval 1 day - interval 1 second |

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

| 2015-04-04 23:59:59                                   |

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

1 row in set (0.00 sec)

 

 

  • ADDTIME(expr1,expr2) --- 增加expr2到expr1上并返回结果;expr1 是一个时间或者日期时间表达式,expr2为一个时间表达式
mysql> SELECT ADDTIME('2007-12-31 23:59:59.999999', '1 1:1:1.000002');

        -> '2008-01-02 01:01:01.000001'

mysql> SELECT ADDTIME('01:00:00.999999', '02:00:00.999998');

        -> '03:00:01.999997'
  • CONVERT_TZ() Convert from one timezone to another
  • CURDATE() --- 返回当前的日期 YYYY-MM-DD,
mysql> select curdate();

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

| curdate()  |

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

| 2015-04-03 |

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

1 row in set (0.00 sec)



mysql> select curdate() + 0;

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

| curdate() + 0 |

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

|      20150403 |

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

1 row in set (0.00 sec)

 

  • CURRENT_DATE(), CURRENT_DATE  ---- CURDATE() 的别名
  • CURRENT_TIME(), CURRENT_TIME --- CURTIME()的别名
  • CURRENT_TIMESTAMP(), CURRENT_TIMESTAMP --- NOW()的别名
  • CURTIME() --- 返回当前的时间
mysql> select curtime();

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

| curtime() |

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

| 14:06:30  |

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

1 row in set (0.00 sec)



mysql> select curtime() + 0;

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

| curtime() + 0 |

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

| 140641.000000 |

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

1 row in set (0.00 sec)

 

  • DATE_ADD() Add time values (intervals) to a date value
  • DATE_FORMAT(date,format) 根据格式化字符串 格式化日期

格式字符串中可以使用 '%' 说明符

常用的:

  %a -- 星期几的缩写  (Sun..Sat)

  %b -- 月份的缩写 (Jan...Dec)

  %c -- 月份 (0--12)

  %D -- 天数 加上了英文后缀 (0th,1sh...)

  %d,%e --  月份中的天数 (0-31)

  %H --  24小时制 (00- 23)

  %h,%I -- 12小时制 (00-12)  

  %i -- 分钟 (00-59)

  %M -- 月份 (january,december)

  %m -- 月份 (00-12)

  %S,%s -- 秒 (00-59)

  %Y -- 年 4位

  %y -- 年 2位

mysql> select date_format(now(),'%Y/%m/%d %H:%m:%s');

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

| date_format(now(),'%Y/%m/%d %H:%m:%s') |

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

| 2015/04/03 14:04:05                    |

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

1 row in set (0.00 sec)

 

 

  • DATE_SUB() Subtract a time value (interval) from a date
  • DATE() -- 提取日期部分
mysql> select date(now());

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

| date(curdate()) |

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

| 2015-04-03      |

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

1 row in set (0.00 sec)

 

  • DATEDIFF(expr1,expr2) 返回expr1 - expr2之间的时间差;expr1,expr2表达式只有日期部分参与运算
mysql> SELECT DATEDIFF('2007-12-31 23:59:59','2007-12-30');

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

| DATEDIFF('2007-12-31 23:59:59','2007-12-30') |

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

|                                            1 |

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

1 row in set (0.00 sec)

 

  • DAY() Synonym for DAYOFMONTH()
  • DAYNAME() Return the name of the weekday
  • DAYOFMONTH() Return the day of the month (0-31)
  • DAYOFWEEK() Return the weekday index of the argument
  • DAYOFYEAR() Return the day of the year (1-366)
  • EXTRACT() Extract part of a date
  • FROM_DAYS() Convert a day number to a date
  • FROM_UNIXTIME(unix_timestamp[,format]) 将unix时间戳格式化为日期字符串
mysql> select from_unixtime(unix_timestamp(),'%Y-%m-%d');

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

| from_unixtime(unix_timestamp(),'%Y-%m-%d') |

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

| 2015-04-03                                 |

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

1 row in set (0.00 sec)

 

  • GET_FORMAT() Return a date format string
  • HOUR(time) -- 提取小时部分
mysql> select HOUR(now());

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

| HOUR(now()) |

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

|          14 |

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

1 row in set (0.00 sec)

 

  • LAST_DAY(date)-- 返回指定月份的最后一天。如果参数无效,则返回NULL。
mysql> select last_day('2013-2-5');

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

| last_day('2013-2-5') |

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

| 2013-02-28           |

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

1 row in set (0.00 sec)



mysql> select last_day('2004-2-5');

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

| last_day('2004-2-5') |

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

| 2004-02-29           |

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

1 row in set (0.00 sec)



mysql> select last_day('2004-2-35');

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

| last_day('2004-2-35') |

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

| NULL                  |

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

1 row in set, 1 warning (0.00 sec)

 

  • LOCALTIME(), LOCALTIME Synonym for NOW()
  • LOCALTIMESTAMP, LOCALTIMESTAMP() Synonym for NOW()
  • MAKEDATE(year,dayofyear) Create a date from the year and day of year
  • MAKETIME MAKETIME(hour,minute,second)
  • MICROSECOND(expr) -- 返回expr表达式的毫秒数
  • MINUTE() Return the minute from the argument
  • MONTH() Return the month from the date passed
  • MONTHNAME(date) --- 返回月份的全称
mysql> select monthname(now());

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

| monthname(now()) |

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

| April            |

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

1 row in set (0.00 sec)

 

  • NOW() -- 返回当前的日期和时间
  • PERIOD_ADD() Add a period to a year-month
  • PERIOD_DIFF() Return the number of months between periods
  • QUARTER() Return the quarter from a date argument
  • SEC_TO_TIME() Converts seconds to 'HH:MM:SS' format
  • SECOND() --返回秒数 (0-59)
  • STR_TO_DATE() Convert a string to a date
  • SUBDATE() A synonym for DATE_SUB() when invoked with three arguments
  • SUBTIME() Subtract times
  • SYSDATE() Return the time at which the function executes
  • TIME_FORMAT() Format as time
  • TIME_TO_SEC() Return the argument converted to seconds
  • TIME(datetime expr) -- 提取表达式的时间部分
  • TIMEDIFF() Subtract time
  • TIMESTAMP(expr1[,expr2])-- 如果是一个参数,则将expr1作为datetime返回,如果有两个参数,将第二个time类型的参数增加到expr1上,返回datetime类型
mysql> select timestamp('2015-4-8');

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

| timestamp('2015-4-8') |

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

| 2015-04-08 00:00:00   |

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

1 row in set (0.00 sec)



mysql> select timestamp('2015-4-8','10:20:30');

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

| timestamp('2015-4-8','10:20:30') |

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

| 2015-04-08 10:20:30              |

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

1 row in set (0.00 sec)

 

  • TIMESTAMPADD(unit,interval,datetime expr) --- 为date或者datetime类型的expr增加interval,单位由 unit确定;

    unit单位:MICROSECOND、SECOND、MINUTE, HOUR, DAY, WEEK, MONTH, QUARTER, or YEAR

mysql> select timestampadd(minute,1,'2015-4-8');

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

| timestampadd(minute,1,'2015-4-8') |

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

| 2015-04-08 00:01:00               |

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

1 row in set (0.00 sec)



mysql> select timestampadd(week,1,'2015-4-8');

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

| timestampadd(week,1,'2015-4-8') |

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

| 2015-04-15                      |

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

1 row in set (0.00 sec)

 

  • TIMESTAMPDIFF(unit,datetime expr1,datetime expr2) --返回expr1 - expr2的值,返回值的单位由 unit参数决定。
mysql> select timestampdiff(MONTH,'2015-4-8','2015-1-1');

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

| timestampdiff(MONTH,'2015-4-8','2015-1-1') |

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

|                                         -3 |

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

1 row in set (0.00 sec)



mysql> select timestampdiff(MINUTE,'2015-1-1','2015-4-8');

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

| timestampdiff(MINUTE,'2015-1-1','2015-4-8') |

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

|                                      139680 |

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

1 row in set (0.00 sec)

 

  • TO_DAYS() Return the date argument converted to days
  • TO_SECONDS() Return the date or datetime argument converted to seconds since Year 0
  • UNIX_TIMESTAMP() -- 返回unix时间戳
mysql> select unix_timestamp();

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

| unix_timestamp() |

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

|       1428042298 |

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

1 row in set (0.00 sec)

 

  • UTC_DATE() Return the current UTC date
  • UTC_TIME() Return the current UTC time
  • UTC_TIMESTAMP() Return the current UTC date and time
  • WEEK() Return the week number
  • WEEKDAY() Return the weekday index
  • WEEKOFYEAR() Return the calendar week of the date (0-53)
  • YEAR() --- 获取年份
mysql> select year(now());

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

| year(now()) |

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

|        2015 |

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

1 row in set (0.00 sec)

 

  • YEARWEEK() Return the year and week

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