MySQL Date and Time Functions

Date and Time Functions 

 

날짜 함수, 시간 함수 정도 되겠지

 

MySQL에 날짜와 시간에 관한 함수를 보니 약 60개정도가 있다.

 

사소하게 보이는 함수도 많고, 유용하게 보이는 것도 많고, 처음보는 것도 있고, 혹은 전혀 쓰지 않을 것 같은 것들도 있다.

이것들을 간단하게 정리해보려고 한다.

 

Name	Description
ADDDATE()	ADD time values (intervals) to a date value
ADDTIME	Add time
CONVERT_TZ()	Convert from one time zone to another
CURDATE()	Return the current date
CURRENT_DATE(), CURRENT_DATE	Synonyms for CURDATE()
CURRENT_TIME(), CURRENT_TIME	Synonyms for CURTIME()
CURRENT_TIMESTAMP() CURRENT_TIMESTAMP	Synonyms for NOW()
CURTIME()	Retrun the current time
DATE()	Extract the date part of a date or datetime expression
DATE_ADD()	Add time values(intervals) to a date value
DATE_FORMAT()	Format date as specified
DATE_SUB()	Substract a time value(interval) from a date
DATE_DIFF()	Substract tow dates
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()	Format Unix timestamp as a date
GET_FORMAT()	Return a date format string
HOUR()	Extract the hour
LAST_DAY()	Return the last day of the month for the argument
LOCALTIME(), LOCALTIME	Synonym for NOW()
LOCALTIMESTAMP(), LOCALTIMESTAMP	Synonym for NOW()
MAKEDATE()	Create a date from the year and day of year
MAKETIME()	Create time from hour, minute, second
MICROSECOND()	Return the microseconds from argument
MINUTE()	Return the minute from argument
MONTH()	Return the month form the date passed
MONTHNAME()	Return the name of the month
NOW()	Return the current date and time
PERIOD_ADD()	Add a period to a year-month
PERIOD_DIFF()	Return the number of months between periods
QUARTER()	Return the quarter form a date argument
SEC_TO_TIME()	Converts seconds to "hh:mm:ss" format
SECOND()	Return the second(0-59)
STR_TO_DATE()	Convert a string to a date
SUBDATE()	Synonym for DATE_SUB() when invoked with three arguments
SUBTIME()	Substract times
SYSDATE()	Return the time at which the function executes
TIME()	Extract the time portion of the expression passed
TIME_FORMAT()	Format as time
TIME_TO_SEC()	Return the argument converted to seconds
TIMEDIFF()	Substract time
TIMESTAMP()	With a single argument, this function returns the date or datetime expression; with two arguments, the sum of the arguments
TIMESTAMPADD()	Add an intever to a datetime expression
TIMESTAMPDIFF()	Substract an interval from a datetime expression
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()	Return a Unix timestamp
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(1-53)
YEAR()	Return the year
YEARWEEK()	Return the year and week