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DATEADD

SQL Server 2000

Returns a new datetime value based on adding an interval to the specified date.

Syntax

DATEADD ( datepart , number, date )

Arguments

datepart

Is the parameter that specifies on which part of the date to return a new value. The table lists the dateparts and abbreviations recognized by Microsoft® SQL Server™.

Datepart Abbreviations
Year yy, yyyy
quarter qq, q
Month mm, m
dayofyear dy, y
Day dd, d
Week wk, ww
Hour hh
minute mi, n
second ss, s
millisecond ms

number

Is the value used to increment datepart. If you specify a value that is not an integer, the fractional part of the value is discarded. For example, if you specify day for datepart and1.75 for number, date is incremented by 1.

date

Is an expression that returns a datetime or smalldatetime value, or a character string in a date format. For more information about specifying dates, see datetime and smalldatetime.

If you specify only the last two digits of the year, values less than or equal to the last two digits of the value of the two digit year cutoff configuration option are in the same century as the cutoff year. Values greater than the last two digits of the value of this option are in the century that precedes the cutoff year. For example, if two digit year cutoff is 2049 (default), 49 is interpreted as 2049 and 2050 is interpreted as 1950. To avoid ambiguity, use four-digit years.

Return Types

Returns datetime, but smalldatetime if the date argument is smalldatetime.

Examples

This example prints a listing of a time frame for titles in the pubs database. This time frame represents the existing publication date plus 21 days.

USE pubs
GO
SELECT DATEADD(day, 21, pubdate) AS timeframe
FROM titles
GO

Here is the result set:

timeframe                   
--------------------------- 
Jul 3 1991 12:00AM          
Jun 30 1991 12:00AM         
Jul 21 1991 12:00AM         
Jul 13 1991 12:00AM         
Jun 30 1991 12:00AM         
Jul 9 1991 12:00AM          
Mar 14 1997  5:09PM         
Jul 21 1991 12:00AM         
Jul 3 1994 12:00AM          
Mar 14 1997  5:09PM         
Nov 11 1991 12:00AM         
Jul 6 1991 12:00AM          
Oct 26 1991 12:00AM         
Jul 3 1991 12:00AM          
Jul 3 1991 12:00AM          
Nov 11 1991 12:00AM         
Jul 3 1991 12:00AM          
Jul 3 1991 12:00AM          

(18 row(s) affected)

See Also

CAST and CONVERT

Data Types

Date and Time Functions

Time Formats

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