DATEADD
Returns a specified date with the specified number interval (signed integer) added to a specified datepart of that date.
Syntax
DATEADD (datepart , number , date )
Arguments
datepart
Is the part of date to which an integer number is added. The following table lists all valid datepart arguments. User-defined variable equivalents are not valid.
| datepart | Abbreviations |
|---|---|
| year | yy, yyyy |
| quarter | qq, q |
| month | mm, m |
| dayofyear | dy, y |
| day | dd, d |
| week | wk, ww |
| weekday | dw, w |
| hour | hh |
| minute | mi, n |
| second | ss, s |
| millisecond | ms |
| microsecond | mcs |
| nanosecond | ns |
number
Is an expression that can be resolved to an int that is added to a datepart of date. User-defined variables are valid.
If you specify a value with a decimal fraction, the fraction is truncated and not rounded.
date
Is an expression that can be resolved to a time, date, smalldatetime, datetime, datetime2, or datetimeoffset value. date can be an expression, column expression, user-defined variable, or string literal. If the expression is a string literal, it must resolve to a datetime. To avoid ambiguity, use four-digit years.
Return types
The return data type is the data type of the date argument, except for string literals.
The return data type for a string literal is datetime.
Example
SELECT DATEADD(hour, 23, '2007-10-30 12:15:32')