Microsoft SQL Server Dates DATEADD for adding and subtracting time periods
Example
General syntax:
DATEADD (datepart , number , datetime_expr)
To add a time measure, the number must be positive. To subtract a time measure, the number must be negative.
Examples
DECLARE @now DATETIME2 = GETDATE();
SELECT @now; --2016-07-21 14:39:46.4170000
SELECT DATEADD(YEAR, 1, @now) --2017-07-21 14:39:46.4170000
SELECT DATEADD(QUARTER, 1, @now) --2016-10-21 14:39:46.4170000
SELECT DATEADD(WEEK, 1, @now) --2016-07-28 14:39:46.4170000
SELECT DATEADD(DAY, 1, @now) --2016-07-22 14:39:46.4170000
SELECT DATEADD(HOUR, 1, @now) --2016-07-21 15:39:46.4170000
SELECT DATEADD(MINUTE, 1, @now) --2016-07-21 14:40:46.4170000
SELECT DATEADD(SECOND, 1, @now) --2016-07-21 14:39:47.4170000
SELECT DATEADD(MILLISECOND, 1, @now)--2016-07-21 14:39:46.4180000
NOTE: DATEADD also accepts abbreviations in the datepart parameter. Use of these abbreviations is generally discouraged as they can be confusing (m vs mi, ww vs w, etc.).
