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SQL DATEADD Function




The DATEADD function is used to add an interval to a date in MS SQL SERVER
The usage for the DATEADD function is
DATEADD (datepart, number, expression)
where the data type of <expression> is some type of date, time, or datetime. <number> is an integer (can be positive or negative). <datepart> can be one of the following:
datepart
abbreviation
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
microsecond
mcs
nanosecond
ns
TZoffset
tz
ISO_WEEK
isowk, isoww

The result returned has the same data type as <expression>.


SQL DATEADD Syntax
DATEADD ( datepart , number, date )

Query:SELECT DATEADD(Year, 3, '2012-06-04')
OUTPUT Value = 2015-06-04 00:00:00.000

Query:SELECT DATEADD(Month, 3, '2012-06-04')
OUTPUT Value = 2012-09-04 00:00:00.000
Query:SELECT DATEADD(dayofyear,3, '2012-06-04')
OUTPUT Value = 2012-06-07 00:00:00.000

Query:SELECT DATEADD(Day, 3, '2012-06-04')
OUTPUT Value = 2012-06-07 00:00:00.000
Query:SELECT DATEADD(Week, 3, @DateNow)
OUTPUT Value = 2012-06-25 00:00:00.000

Query:SELECT DATEADD(Hour, 3, @DateNow)
OUTPUT Value = 2012-06-04 03:00:00.000

Query:SELECT DATEADD(minute, 3, @DateNow)
OUTPUT Value = 2012-06-04 00:03:00.000
Query:SELECT DATEADD(second, 3, @DateNow
OUTPUT Value = 2012-06-04 00:00:03.000
Query:SELECT DATEADD(millisecond, 3, @DateNow)
OUTPUT Value = 2012-06-04 00:00:00.003

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

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