Bits of .NET

DATEADD(interval, number, date)

Parameter Values (interval, number, date)

Parameter	Description
interval	Required. The time/date part to return. Can be one of the following values: year, yyyy, yy = Year quarter, qq, q = Quarter month, mm, m = month dayofyear = Day of the year day, dy, y = Day week, ww, wk = Week weekday, dw, w = Weekday hour, hh = hour minute, mi, n = Minute second, ss, s = Second millisecond, ms = Millisecond
number	Required. The number of intervals to use
date	Required. The date to which the interval should be added

Examples:

-- GETDATE(): 2018-06-14 11:53:38.350

SELECT DATEADD(year, 1, GETDATE()) AS DateAdd;
-- OUTPUT:
2019-06-14 11:48:14.240


SELECT DATEADD(week, 1, GETDATE()) AS DateAdd;
-- OUTPUT:
2018-06-21 11:52:56.263

SELECT DATEADD(month, 1, GETDATE()) AS DateAdd;
-- OUTPUT:
2018-07-14 11:54:22.617

SELECT DATEADD(day, 15, GETDATE()) AS DateAdd;
-- OUTPUT:
2018-06-29 11:55:06.413