DateAdd (function)

Syntax DateAdd (interval$, increment&, date)
Description Returns a Date variant representing the sum of date and a specified number (increment) of time intervals (interval$).
Comments This function adds a specified number (increment) of time intervals (interval$) to the specified date (date). The following table describes the parameters to the DateAdd function:
Parameter Description
Interval$ String expression indicating the time interval used in the addition.
Increment Integer indicating the number of time intervals you wish to add. Positive values result in dates in the future; negative values result in dates in the past.
Date Any expression convertible to a Date .
The interval$ parameter specifies what unit of time is to be added to the given date. It can be any of the following:
Time Intervale
"y" Day of the year
"yyyy" Year
"d" Day
"m" Month
"q" Quarter
"ww" Week
"h" Hour
"n" Minute
"s" Second
"w" Weekday
To add days to a date, you may use either day, day of the year, or weekday, as they are all equivalent (" d ", " y ", " w "). The DateAdd function will never return an invalid date/time expression. The following example adds two months to December 31, 1992: 
  s# = DateAdd("m",2,"December 31,1992")
In this example, s is returned as the double-precision number equal to " February 28, 1993 ", not " February 31, 1993 ". A runtime error is generated if you try to subtract a time interval that is larger than the time value of the date.
Example This example gets today's date using the Date$ function; adds three years, two months, one week, and two days to it; and then displays the result in a dialog box. 
Sub Main()
  Dim sdate$
  sdate$ = Date$
  NewDate# = DateAdd("yyyy",4,sdate$)
  NewDate# = DateAdd("m",3,NewDate#)
  NewDate# = DateAdd("ww",2,NewDate#)
  NewDate# = DateAdd("d",1,NewDate#)
  s$ = "Four years, three months, two weeks, and one day from now will be: "
  s$ = s$ & Format(NewDate#,"long date")
  MsgBox s$
End Sub
See Also DateDiff (function).