Rechercher dans le manuel MySQL
12.7 Date and Time Functions
This section describes the functions that can be used to manipulate temporal values. See Section 11.3, “Date and Time Types”, for a description of the range of values each date and time type has and the valid formats in which values may be specified.
Table 12.13 Date and Time Functions
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() |
Return 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() |
Subtract a time value (interval) from a date |
DATEDIFF() |
Subtract two 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 the argument |
MONTH() |
Return the month from 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 from 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() |
Subtract 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() |
Subtract 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 interval to a datetime expression |
TIMESTAMPDIFF() |
Subtract 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 |
Here is an example that uses date functions. The following query
selects all rows with a date_col
value
from within the last 30 days:
The query also selects rows with dates that lie in the future.
Functions that expect date values usually accept datetime values and ignore the time part. Functions that expect time values usually accept datetime values and ignore the date part.
Functions that return the current date or time each are evaluated
only once per query at the start of query execution. This means
that multiple references to a function such as
NOW()
within a single query always
produce the same result. (For our purposes, a single query also
includes a call to a stored program (stored routine, trigger, or
event) and all subprograms called by that program.) This principle
also applies to CURDATE()
,
CURTIME()
,
UTC_DATE()
,
UTC_TIME()
,
UTC_TIMESTAMP()
, and to any of
their synonyms.
The CURRENT_TIMESTAMP()
,
CURRENT_TIME()
,
CURRENT_DATE()
, and
FROM_UNIXTIME()
functions return
values in the connection's current time zone, which is available
as the value of the time_zone
system variable. In addition,
UNIX_TIMESTAMP()
assumes that its
argument is a datetime value in the current time zone. See
Section 5.1.13, “MySQL Server Time Zone Support”.
Some date functions can be used with “zero” dates or
incomplete dates such as '2001-11-00'
, whereas
others cannot. Functions that extract parts of dates typically
work with incomplete dates and thus can return 0 when you might
otherwise expect a nonzero value. For example:
- -> 0, 0
Other functions expect complete dates and return
NULL
for incomplete dates. These include
functions that perform date arithmetic or that map parts of dates
to names. For example:
Several functions are more strict when passed a
DATE()
function value as their
argument and reject incomplete dates with a day part of zero.
These functions are affected:
CONVERT_TZ()
,
DATE_ADD()
,
DATE_SUB()
,
DAYOFYEAR()
,
LAST_DAY()
(permits a day part of
zero), TIMESTAMPDIFF()
,
TO_DAYS()
,
TO_SECONDS()
,
WEEK()
,
WEEKDAY()
,
WEEKOFYEAR()
,
YEARWEEK()
.
Fractional seconds for TIME
,
DATETIME
, and TIMESTAMP
values are supported, with up to microsecond precision. Functions
that take temporal arguments accept values with fractional
seconds. Return values from temporal functions include fractional
seconds as appropriate.
ADDDATE(
,date
,INTERVALexpr
unit
)ADDDATE(
expr
,days
)When invoked with the
INTERVAL
form of the second argument,ADDDATE()
is a synonym forDATE_ADD()
. The related functionSUBDATE()
is a synonym forDATE_SUB()
. For information on theINTERVAL
unit
argument, see Temporal Intervals.- -> '2008-02-02'
- -> '2008-02-02'
When invoked with the
days
form of the second argument, MySQL treats it as an integer number of days to be added toexpr
.ADDTIME()
addsexpr2
toexpr1
and returns the result.expr1
is a time or datetime expression, andexpr2
is a time expression.CONVERT_TZ()
converts a datetime valuedt
from the time zone given byfrom_tz
to the time zone given byto_tz
and returns the resulting value. Time zones are specified as described in Section 5.1.13, “MySQL Server Time Zone Support”. This function returnsNULL
if the arguments are invalid.If the value falls out of the supported range of the
TIMESTAMP
type when converted fromfrom_tz
to UTC, no conversion occurs. TheTIMESTAMP
range is described in Section 11.1.2, “Date and Time Type Overview”.- -> '2004-01-01 13:00:00'
- -> '2004-01-01 22:00:00'
NoteTo use named time zones such as
'MET'
or'Europe/Moscow'
, the time zone tables must be properly set up. See Section 5.1.13, “MySQL Server Time Zone Support”, for instructions.Returns the current date as a value in
'YYYY-MM-DD'
orYYYYMMDD
format, depending on whether the function is used in a string or numeric context.CURRENT_DATE
andCURRENT_DATE()
are synonyms forCURDATE()
.CURRENT_TIME
,CURRENT_TIME([
fsp
])CURRENT_TIME
andCURRENT_TIME()
are synonyms forCURTIME()
.CURRENT_TIMESTAMP
,CURRENT_TIMESTAMP([
fsp
])CURRENT_TIMESTAMP
andCURRENT_TIMESTAMP()
are synonyms forNOW()
.Returns the current time as a value in
'HH:MM:SS'
orHHMMSS
format, depending on whether the function is used in a string or numeric context. The value is expressed in the current time zone.If the
fsp
argument is given to specify a fractional seconds precision from 0 to 6, the return value includes a fractional seconds part of that many digits.Extracts the date part of the date or datetime expression
expr
.DATEDIFF()
returnsexpr1
−expr2
expressed as a value in days from one date to the other.expr1
andexpr2
are date or date-and-time expressions. Only the date parts of the values are used in the calculation.DATE_ADD(
,date
,INTERVALexpr
unit
)DATE_SUB(
date
,INTERVALexpr
unit
)These functions perform date arithmetic. The
date
argument specifies the starting date or datetime value.expr
is an expression specifying the interval value to be added or subtracted from the starting date.expr
is evaluated as a string; it may start with a-
for negative intervals.unit
is a keyword indicating the units in which the expression should be interpreted.For more information about temporal interval syntax, including a full list of
unit
specifiers, the expected form of theexpr
argument for eachunit
value, and rules for operand interpretation in temporal arithmetic, see Temporal Intervals.The return value depends on the arguments:
DATE
if thedate
argument is aDATE
value and your calculations involve onlyYEAR
,MONTH
, andDAY
parts (that is, no time parts).DATETIME
if the first argument is aDATETIME
(orTIMESTAMP
) value, or if the first argument is aDATE
and theunit
value usesHOURS
,MINUTES
, orSECONDS
.String otherwise.
To ensure that the result is
DATETIME
, you can useCAST()
to convert the first argument toDATETIME
.- -> '2018-05-02'
- -> '2017-05-01'
- -> '2021-01-01 00:00:00'
- -> '2019-01-01 23:59:59'
- -> '2101-01-01 00:01:00'
- -> '2024-12-30 22:58:59'
- -> '1899-12-30 14:00:00'
- -> '1997-12-02'
- -> '1993-01-01 00:00:01.000001'
Formats the
date
value according to theformat
string.The following specifiers may be used in the
format
string. The%
character is required before format specifier characters.Specifier Description %a
Abbreviated weekday name ( Sun
..Sat
)%b
Abbreviated month name ( Jan
..Dec
)%c
Month, numeric ( 0
..12
)%D
Day of the month with English suffix ( 0th
,1st
,2nd
,3rd
, …)%d
Day of the month, numeric ( 00
..31
)%e
Day of the month, numeric ( 0
..31
)%f
Microseconds ( 000000
..999999
)%H
Hour ( 00
..23
)%h
Hour ( 01
..12
)%I
Hour ( 01
..12
)%i
Minutes, numeric ( 00
..59
)%j
Day of year ( 001
..366
)%k
Hour ( 0
..23
)%l
Hour ( 1
..12
)%M
Month name ( January
..December
)%m
Month, numeric ( 00
..12
)%p
AM
orPM
%r
Time, 12-hour ( hh:mm:ss
followed byAM
orPM
)%S
Seconds ( 00
..59
)%s
Seconds ( 00
..59
)%T
Time, 24-hour ( hh:mm:ss
)%U
Week ( 00
..53
), where Sunday is the first day of the week;WEEK()
mode 0%u
Week ( 00
..53
), where Monday is the first day of the week;WEEK()
mode 1%V
Week ( 01
..53
), where Sunday is the first day of the week;WEEK()
mode 2; used with%X
%v
Week ( 01
..53
), where Monday is the first day of the week;WEEK()
mode 3; used with%x
%W
Weekday name ( Sunday
..Saturday
)%w
Day of the week ( 0
=Sunday..6
=Saturday)%X
Year for the week where Sunday is the first day of the week, numeric, four digits; used with %V
%x
Year for the week, where Monday is the first day of the week, numeric, four digits; used with %v
%Y
Year, numeric, four digits %y
Year, numeric (two digits) %%
A literal %
character%
x
x
, for any “x
” not listed aboveRanges for the month and day specifiers begin with zero due to the fact that MySQL permits the storing of incomplete dates such as
'2014-00-00'
.The language used for day and month names and abbreviations is controlled by the value of the
lc_time_names
system variable (Section 10.15, “MySQL Server Locale Support”).For the
%U
,%u
,%V
, and%v
specifiers, see the description of theWEEK()
function for information about the mode values. The mode affects how week numbering occurs.DATE_FORMAT()
returns a string with a character set and collation given bycharacter_set_connection
andcollation_connection
so that it can return month and weekday names containing non-ASCII characters.- -> 'Sunday October 2009'
- -> '22:23:00'
- -> '%D %y %a %d %m %b %j');
- -> '4th 00 Thu 04 10 Oct 277'
- -> '%H %k %I %r %T %S %w');
- -> '22 22 10 10:23:00 PM 22:23:00 00 6'
- -> '1998 52'
- -> '00'
DATE_SUB(
date
,INTERVALexpr
unit
)See the description for
DATE_ADD()
.DAY()
is a synonym forDAYOFMONTH()
.Returns the name of the weekday for
date
. The language used for the name is controlled by the value of thelc_time_names
system variable (Section 10.15, “MySQL Server Locale Support”).Returns the day of the month for
date
, in the range1
to31
, or0
for dates such as'0000-00-00'
or'2008-00-00'
that have a zero day part.- -> 3
Returns the weekday index for
date
(1
= Sunday,2
= Monday, …,7
= Saturday). These index values correspond to the ODBC standard.Returns the day of the year for
date
, in the range1
to366
.The
EXTRACT()
function uses the same kinds ofunit
specifiers asDATE_ADD()
orDATE_SUB()
, but extracts parts from the date rather than performing date arithmetic. For information on theunit
argument, see Temporal Intervals.Given a day number
N
, returns aDATE
value.Use
FROM_DAYS()
with caution on old dates. It is not intended for use with values that precede the advent of the Gregorian calendar (1582). See Section 12.8, “What Calendar Is Used By MySQL?”.FROM_UNIXTIME(
,unix_timestamp
)FROM_UNIXTIME(
unix_timestamp
,format
)Returns a representation of the
unix_timestamp
argument as a value in'YYYY-MM-DD HH:MM:SS'
orYYYYMMDDHHMMSS
format, depending on whether the function is used in a string or numeric context. The value is expressed in the current time zone.unix_timestamp
is an internal timestamp value such as is produced by theUNIX_TIMESTAMP()
function.If
format
is given, the result is formatted according to theformat
string, which is used the same way as listed in the entry for theDATE_FORMAT()
function.- -> '2015-11-13 10:08:01'
- -> 20151113100801
- -> '%Y %D %M %h:%i:%s %x');
- -> '2015 13th November 10:08:01 2015'
NoteIf you use
UNIX_TIMESTAMP()
andFROM_UNIXTIME()
to convert betweenTIMESTAMP
values and Unix timestamp values, the conversion is lossy because the mapping is not one-to-one in both directions. For details, see the description of theUNIX_TIMESTAMP()
function.GET_FORMAT({DATE|TIME|DATETIME}, {'EUR'|'USA'|'JIS'|'ISO'|'INTERNAL'})
Returns a format string. This function is useful in combination with the
DATE_FORMAT()
and theSTR_TO_DATE()
functions.The possible values for the first and second arguments result in several possible format strings (for the specifiers used, see the table in the
DATE_FORMAT()
function description). ISO format refers to ISO 9075, not ISO 8601.Function Call Result GET_FORMAT(DATE,'USA')
'%m.%d.%Y'
GET_FORMAT(DATE,'JIS')
'%Y-%m-%d'
GET_FORMAT(DATE,'ISO')
'%Y-%m-%d'
GET_FORMAT(DATE,'EUR')
'%d.%m.%Y'
GET_FORMAT(DATE,'INTERNAL')
'%Y%m%d'
GET_FORMAT(DATETIME,'USA')
'%Y-%m-%d %H.%i.%s'
GET_FORMAT(DATETIME,'JIS')
'%Y-%m-%d %H:%i:%s'
GET_FORMAT(DATETIME,'ISO')
'%Y-%m-%d %H:%i:%s'
GET_FORMAT(DATETIME,'EUR')
'%Y-%m-%d %H.%i.%s'
GET_FORMAT(DATETIME,'INTERNAL')
'%Y%m%d%H%i%s'
GET_FORMAT(TIME,'USA')
'%h:%i:%s %p'
GET_FORMAT(TIME,'JIS')
'%H:%i:%s'
GET_FORMAT(TIME,'ISO')
'%H:%i:%s'
GET_FORMAT(TIME,'EUR')
'%H.%i.%s'
GET_FORMAT(TIME,'INTERNAL')
'%H%i%s'
TIMESTAMP
can also be used as the first argument toGET_FORMAT()
, in which case the function returns the same values as forDATETIME
.- -> '03.10.2003'
- -> '2003-10-31'
Returns the hour for
time
. The range of the return value is0
to23
for time-of-day values. However, the range ofTIME
values actually is much larger, soHOUR
can return values greater than23
.Takes a date or datetime value and returns the corresponding value for the last day of the month. Returns
NULL
if the argument is invalid.LOCALTIME
andLOCALTIME()
are synonyms forNOW()
.LOCALTIMESTAMP
,LOCALTIMESTAMP([
fsp
])LOCALTIMESTAMP
andLOCALTIMESTAMP()
are synonyms forNOW()
.Returns a date, given year and day-of-year values.
dayofyear
must be greater than 0 or the result isNULL
.Returns a time value calculated from the
hour
,minute
, andsecond
arguments.The
second
argument can have a fractional part.Returns the microseconds from the time or datetime expression
expr
as a number in the range from0
to999999
.- -> 123456
- -> 10
Returns the minute for
time
, in the range0
to59
.Returns the month for
date
, in the range1
to12
for January to December, or0
for dates such as'0000-00-00'
or'2008-00-00'
that have a zero month part.Returns the full name of the month for
date
. The language used for the name is controlled by the value of thelc_time_names
system variable (Section 10.15, “MySQL Server Locale Support”).Returns the current date and time as a value in
'YYYY-MM-DD HH:MM:SS'
orYYYYMMDDHHMMSS
format, depending on whether the function is used in a string or numeric context. The value is expressed in the current time zone.If the
fsp
argument is given to specify a fractional seconds precision from 0 to 6, the return value includes a fractional seconds part of that many digits.NOW()
returns a constant time that indicates the time at which the statement began to execute. (Within a stored function or trigger,NOW()
returns the time at which the function or triggering statement began to execute.) This differs from the behavior forSYSDATE()
, which returns the exact time at which it executes.- +---------------------+----------+---------------------+
- +---------------------+----------+---------------------+
- | 2006-04-12 13:47:36 | 0 | 2006-04-12 13:47:36 |
- +---------------------+----------+---------------------+
- +---------------------+----------+---------------------+
- +---------------------+----------+---------------------+
- | 2006-04-12 13:47:44 | 0 | 2006-04-12 13:47:46 |
- +---------------------+----------+---------------------+
In addition, the
SET TIMESTAMP
statement affects the value returned byNOW()
but not bySYSDATE()
. This means that timestamp settings in the binary log have no effect on invocations ofSYSDATE()
. Setting the timestamp to a nonzero value causes each subsequent invocation ofNOW()
to return that value. Setting the timestamp to zero cancels this effect so thatNOW()
once again returns the current date and time.See the description for
SYSDATE()
for additional information about the differences between the two functions.Adds
N
months to periodP
(in the formatYYMM
orYYYYMM
). Returns a value in the formatYYYYMM
. Note that the period argumentP
is not a date value.- -> 200803
Returns the number of months between periods
P1
andP2
.P1
andP2
should be in the formatYYMM
orYYYYMM
. Note that the period argumentsP1
andP2
are not date values.- -> 11
Returns the quarter of the year for
date
, in the range1
to4
.Returns the second for
time
, in the range0
to59
.Returns the
seconds
argument, converted to hours, minutes, and seconds, as aTIME
value. The range of the result is constrained to that of theTIME
data type. A warning occurs if the argument corresponds to a value outside that range.- -> '00:39:38'
- -> 3938
This is the inverse of the
DATE_FORMAT()
function. It takes a stringstr
and a format stringformat
.STR_TO_DATE()
returns aDATETIME
value if the format string contains both date and time parts, or aDATE
orTIME
value if the string contains only date or time parts. If the date, time, or datetime value extracted fromstr
is illegal,STR_TO_DATE()
returnsNULL
and produces a warning.The server scans
str
attempting to matchformat
to it. The format string can contain literal characters and format specifiers beginning with%
. Literal characters informat
must match literally instr
. Format specifiers informat
must match a date or time part instr
. For the specifiers that can be used informat
, see theDATE_FORMAT()
function description.- -> '2013-05-01'
- -> '2013-05-01'
Scanning starts at the beginning of
str
and fails ifformat
is found not to match. Extra characters at the end ofstr
are ignored.- -> '09:30:17'
- -> NULL
- -> '09:30:17'
Unspecified date or time parts have a value of 0, so incompletely specified values in
str
produce a result with some or all parts set to 0:- -> '0000-00-00'
- -> '0000-09-00'
- -> '00:00:09'
Range checking on the parts of date values is as described in Section 11.3.1, “The DATE, DATETIME, and TIMESTAMP Types”. This means, for example, that “zero” dates or dates with part values of 0 are permitted unless the SQL mode is set to disallow such values.
- -> '0000-00-00'
- -> '2004-04-31'
If the
NO_ZERO_DATE
orNO_ZERO_IN_DATE
SQL mode is enabled, zero dates or part of dates are disallowed. In that case,STR_TO_DATE()
returnsNULL
and generates a warning:- +-------------------------------------+
- +-------------------------------------+
- | 15:35:00 |
- +-------------------------------------+
- +-------------------------------------+
- +-------------------------------------+
- +-------------------------------------+
- *************************** 1. row ***************************
- Level: Warning
- Code: 1411
NoteYou cannot use format
"%X%V"
to convert a year-week string to a date because the combination of a year and week does not uniquely identify a year and month if the week crosses a month boundary. To convert a year-week to a date, you should also specify the weekday:- -> '2004-10-18'
SUBDATE(
,date
,INTERVALexpr
unit
)SUBDATE(
expr
,days
)When invoked with the
INTERVAL
form of the second argument,SUBDATE()
is a synonym forDATE_SUB()
. For information on theINTERVAL
unit
argument, see the discussion forDATE_ADD()
.- -> '2007-12-02'
- -> '2007-12-02'
The second form enables the use of an integer value for
days
. In such cases, it is interpreted as the number of days to be subtracted from the date or datetime expressionexpr
.SUBTIME()
returnsexpr1
−expr2
expressed as a value in the same format asexpr1
.expr1
is a time or datetime expression, andexpr2
is a time expression.Returns the current date and time as a value in
'YYYY-MM-DD HH:MM:SS'
orYYYYMMDDHHMMSS
format, depending on whether the function is used in a string or numeric context.If the
fsp
argument is given to specify a fractional seconds precision from 0 to 6, the return value includes a fractional seconds part of that many digits.SYSDATE()
returns the time at which it executes. This differs from the behavior forNOW()
, which returns a constant time that indicates the time at which the statement began to execute. (Within a stored function or trigger,NOW()
returns the time at which the function or triggering statement began to execute.)- +---------------------+----------+---------------------+
- +---------------------+----------+---------------------+
- | 2006-04-12 13:47:36 | 0 | 2006-04-12 13:47:36 |
- +---------------------+----------+---------------------+
- +---------------------+----------+---------------------+
- +---------------------+----------+---------------------+
- | 2006-04-12 13:47:44 | 0 | 2006-04-12 13:47:46 |
- +---------------------+----------+---------------------+
In addition, the
SET TIMESTAMP
statement affects the value returned byNOW()
but not bySYSDATE()
. This means that timestamp settings in the binary log have no effect on invocations ofSYSDATE()
.Because
SYSDATE()
can return different values even within the same statement, and is not affected bySET TIMESTAMP
, it is nondeterministic and therefore unsafe for replication if statement-based binary logging is used. If that is a problem, you can use row-based logging.Alternatively, you can use the
--sysdate-is-now
option to causeSYSDATE()
to be an alias forNOW()
. This works if the option is used on both the master and the slave.The nondeterministic nature of
SYSDATE()
also means that indexes cannot be used for evaluating expressions that refer to it.Extracts the time part of the time or datetime expression
expr
and returns it as a string.This function is unsafe for statement-based replication. A warning is logged if you use this function when
binlog_format
is set toSTATEMENT
.TIMEDIFF()
returnsexpr1
−expr2
expressed as a time value.expr1
andexpr2
are time or date-and-time expressions, but both must be of the same type.The result returned by
TIMEDIFF()
is limited to the range allowed forTIME
values. Alternatively, you can use either of the functionsTIMESTAMPDIFF()
andUNIX_TIMESTAMP()
, both of which return integers.TIMESTAMP(
,expr
)TIMESTAMP(
expr1
,expr2
)With a single argument, this function returns the date or datetime expression
expr
as a datetime value. With two arguments, it adds the time expressionexpr2
to the date or datetime expressionexpr1
and returns the result as a datetime value.TIMESTAMPADD(
unit
,interval
,datetime_expr
)Adds the integer expression
interval
to the date or datetime expressiondatetime_expr
. The unit forinterval
is given by theunit
argument, which should be one of the following values:MICROSECOND
(microseconds),SECOND
,MINUTE
,HOUR
,DAY
,WEEK
,MONTH
,QUARTER
, orYEAR
.The
unit
value may be specified using one of keywords as shown, or with a prefix ofSQL_TSI_
. For example,DAY
andSQL_TSI_DAY
both are legal.- -> '2003-01-02 00:01:00'
- -> '2003-01-09'
TIMESTAMPDIFF(
unit
,datetime_expr1
,datetime_expr2
)Returns
datetime_expr2
−datetime_expr1
, wheredatetime_expr1
anddatetime_expr2
are date or datetime expressions. One expression may be a date and the other a datetime; a date value is treated as a datetime having the time part'00:00:00'
where necessary. The unit for the result (an integer) is given by theunit
argument. The legal values forunit
are the same as those listed in the description of theTIMESTAMPADD()
function.- -> 3
- -> -1
- -> 128885
NoteThe order of the date or datetime arguments for this function is the opposite of that used with the
TIMESTAMP()
function when invoked with 2 arguments.This is used like the
DATE_FORMAT()
function, but theformat
string may contain format specifiers only for hours, minutes, seconds, and microseconds. Other specifiers produce aNULL
value or0
.If the
time
value contains an hour part that is greater than23
, the%H
and%k
hour format specifiers produce a value larger than the usual range of0..23
. The other hour format specifiers produce the hour value modulo 12.- -> '100 100 04 04 4'
Returns the
time
argument, converted to seconds.- -> 80580
- -> 2378
Given a date
date
, returns a day number (the number of days since year 0).TO_DAYS()
is not intended for use with values that precede the advent of the Gregorian calendar (1582), because it does not take into account the days that were lost when the calendar was changed. For dates before 1582 (and possibly a later year in other locales), results from this function are not reliable. See Section 12.8, “What Calendar Is Used By MySQL?”, for details.Remember that MySQL converts two-digit year values in dates to four-digit form using the rules in Section 11.3, “Date and Time Types”. For example,
'2008-10-07'
and'08-10-07'
are seen as identical dates:In MySQL, the zero date is defined as
'0000-00-00'
, even though this date is itself considered invalid. This means that, for'0000-00-00'
and'0000-01-01'
,TO_DAYS()
returns the values shown here:- +-----------------------+
- +-----------------------+
- +-----------------------+
- +---------+------+----------------------------------------+
- | Level | Code | Message |
- +---------+------+----------------------------------------+
- +---------+------+----------------------------------------+
- +-----------------------+
- +-----------------------+
- | 1 |
- +-----------------------+
This is true whether or not the
ALLOW_INVALID_DATES
SQL server mode is enabled.Given a date or datetime
expr
, returns the number of seconds since the year 0. Ifexpr
is not a valid date or datetime value, returnsNULL
.- -> 62966505600
- -> 63426672000
- -> 63426721412
- -> 63426721458
Like
TO_DAYS()
,TO_SECONDS()
is not intended for use with values that precede the advent of the Gregorian calendar (1582), because it does not take into account the days that were lost when the calendar was changed. For dates before 1582 (and possibly a later year in other locales), results from this function are not reliable. See Section 12.8, “What Calendar Is Used By MySQL?”, for details.Like
TO_DAYS()
,TO_SECONDS()
, converts two-digit year values in dates to four-digit form using the rules in Section 11.3, “Date and Time Types”.In MySQL, the zero date is defined as
'0000-00-00'
, even though this date is itself considered invalid. This means that, for'0000-00-00'
and'0000-01-01'
,TO_SECONDS()
returns the values shown here:- +--------------------------+
- | TO_SECONDS('0000-00-00') |
- +--------------------------+
- +--------------------------+
- +---------+------+----------------------------------------+
- | Level | Code | Message |
- +---------+------+----------------------------------------+
- +---------+------+----------------------------------------+
- +--------------------------+
- | TO_SECONDS('0000-01-01') |
- +--------------------------+
- | 86400 |
- +--------------------------+
This is true whether or not the
ALLOW_INVALID_DATES
SQL server mode is enabled.UNIX_TIMESTAMP()
,UNIX_TIMESTAMP(
date
)If called with no argument, returns a Unix timestamp (seconds since
'1970-01-01 00:00:00'
UTC). The return value is an integer if no argument is given or the argument does not include a fractional seconds part, orDECIMAL
if an argument is given that includes a fractional seconds part.If
UNIX_TIMESTAMP()
is called with adate
argument, it returns the value of the argument as seconds since'1970-01-01 00:00:00'
UTC. Thedate
argument may be aDATE
,DATETIME
, orTIMESTAMP
string, or a number inYYMMDD
,YYMMDDHHMMSS
,YYYYMMDD
, orYYYYMMDDHHMMSS
format. If the argument includes a time part, it may optionally include a fractional seconds part. The server interpretsdate
as a value in the current time zone and converts it to an internal value in UTC. Clients can set their time zone as described in Section 5.1.13, “MySQL Server Time Zone Support”.- -> 1447431666
- -> 1447431619
- -> 1447431619.012
When
UNIX_TIMESTAMP()
is used on aTIMESTAMP
column, the function returns the internal timestamp value directly, with no implicit “string-to-Unix-timestamp” conversion. If you pass an out-of-range date toUNIX_TIMESTAMP()
, it returns0
. The valid range of values is the same as for theTIMESTAMP
data type:'1970-01-01 00:00:01.000000'
UTC to'2038-01-19 03:14:07.999999'
UTC.If you use
UNIX_TIMESTAMP()
andFROM_UNIXTIME()
to convert betweenTIMESTAMP
values and Unix timestamp values, the conversion is lossy because the mapping is not one-to-one in both directions. For example, due to conventions for local time zone changes, it is possible for twoUNIX_TIMESTAMP()
to map twoTIMESTAMP
values to the same Unix timestamp value.FROM_UNIXTIME()
will map that value back to only one of the originalTIMESTAMP
values. Here is an example, usingTIMESTAMP
values in theCET
time zone:- +---------------------------------------+
- +---------------------------------------+
- | 1111885200 |
- +---------------------------------------+
- +---------------------------------------+
- +---------------------------------------+
- | 1111885200 |
- +---------------------------------------+
- +---------------------------+
- +---------------------------+
- | 2005-03-27 03:00:00 |
- +---------------------------+
If you want to subtract
UNIX_TIMESTAMP()
columns, you might want to cast the result to signed integers. See Section 12.10, “Cast Functions and Operators”.Returns the current UTC date as a value in
'YYYY-MM-DD'
orYYYYMMDD
format, depending on whether the function is used in a string or numeric context.Returns the current UTC time as a value in
'HH:MM:SS'
orHHMMSS
format, depending on whether the function is used in a string or numeric context.If the
fsp
argument is given to specify a fractional seconds precision from 0 to 6, the return value includes a fractional seconds part of that many digits.UTC_TIMESTAMP
,UTC_TIMESTAMP([
fsp
])Returns the current UTC date and time as a value in
'YYYY-MM-DD HH:MM:SS'
orYYYYMMDDHHMMSS
format, depending on whether the function is used in a string or numeric context.If the
fsp
argument is given to specify a fractional seconds precision from 0 to 6, the return value includes a fractional seconds part of that many digits.- -> '2003-08-14 18:08:04', 20030814180804.000000
This function returns the week number for
date
. The two-argument form ofWEEK()
enables you to specify whether the week starts on Sunday or Monday and whether the return value should be in the range from0
to53
or from1
to53
. If themode
argument is omitted, the value of thedefault_week_format
system variable is used. See Section 5.1.8, “Server System Variables”.The following table describes how the
mode
argument works.Mode First day of week Range Week 1 is the first week … 0 Sunday 0-53 with a Sunday in this year 1 Monday 0-53 with 4 or more days this year 2 Sunday 1-53 with a Sunday in this year 3 Monday 1-53 with 4 or more days this year 4 Sunday 0-53 with 4 or more days this year 5 Monday 0-53 with a Monday in this year 6 Sunday 1-53 with 4 or more days this year 7 Monday 1-53 with a Monday in this year For
mode
values with a meaning of “with 4 or more days this year,” weeks are numbered according to ISO 8601:1988:If the week containing January 1 has 4 or more days in the new year, it is week 1.
Otherwise, it is the last week of the previous year, and the next week is week 1.
- -> 7
- -> 7
- -> 8
- -> 53
If a date falls in the last week of the previous year, MySQL returns
0
if you do not use2
,3
,6
, or7
as the optionalmode
argument:One might argue that
WEEK()
should return52
because the given date actually occurs in the 52nd week of 1999.WEEK()
returns0
instead so that the return value is “the week number in the given year.” This makes use of theWEEK()
function reliable when combined with other functions that extract a date part from a date.If you prefer a result evaluated with respect to the year that contains the first day of the week for the given date, use
0
,2
,5
, or7
as the optionalmode
argument.Alternatively, use the
YEARWEEK()
function:Returns the weekday index for
date
(0
= Monday,1
= Tuesday, …6
= Sunday).Returns the calendar week of the date as a number in the range from
1
to53
.WEEKOFYEAR()
is a compatibility function that is equivalent toWEEK(
.date
,3)- -> 8
Returns the year for
date
, in the range1000
to9999
, or0
for the “zero” date.YEARWEEK(
,date
)YEARWEEK(
date
,mode
)Returns year and week for a date. The year in the result may be different from the year in the date argument for the first and the last week of the year.
The
mode
argument works exactly like themode
argument toWEEK()
. For the single-argument syntax, amode
value of 0 is used. UnlikeWEEK()
, the value ofdefault_week_format
does not influenceYEARWEEK()
.The week number is different from what the
WEEK()
function would return (0
) for optional arguments0
or1
, asWEEK()
then returns the week in the context of the given year.
Traduction non disponible
Le manuel MySQL n'est pas encore traduit en français sur l'infobrol. Seule la version anglaise est disponible pour l'instant.
Document créé le 26/06/2006, dernière modification le 26/10/2018
Source du document imprimé : https://www.gaudry.be/mysql-rf-date-and-time-functions.html
L'infobrol est un site personnel dont le contenu n'engage que moi. Le texte est mis à disposition sous licence CreativeCommons(BY-NC-SA). Plus d'info sur les conditions d'utilisation et sur l'auteur.
Références
Ces références et liens indiquent des documents consultés lors de la rédaction de cette page, ou qui peuvent apporter un complément d'information, mais les auteurs de ces sources ne peuvent être tenus responsables du contenu de cette page.
L'auteur de ce site est seul responsable de la manière dont sont présentés ici les différents concepts, et des libertés qui sont prises avec les ouvrages de référence. N'oubliez pas que vous devez croiser les informations de sources multiples afin de diminuer les risques d'erreurs.