DateAdd(datepart, number, date)Returns a date to which a specified time interval has been added.
One of the following strings:
yyyy
-- Year
q
-- Quarter
m
-- Month
y
-- Day of year
d
-- Day
w
-- Weekday
ww
-- Week
h
-- Hour
n
-- Minute
s
-- Second
Number of units of datepart to add to date (positive to get dates in the future or negative to get dates in the past).
Date/time object in the period from 100 AD to 9999 AD.