DateAdd

Add a time interval to a Date

Syntax 
      DateAdd (interval,number,date)

Key
   number    The number of intervals to add

   date      The date

   interval  The date/Time interval to add:

                yyyy  Year
                 q    Quarter
                 m    Month
                 y    Day of year
                 d    Day
                 w    Weekday
                 h    Hour
                 n    Minute
                 s    Second

To subtract dates just specify number as a negative, i.e. "m", -6 will subtract 6 months.

Example: add 7 days

dtmStart="18-Feb-10"
WScript.Echo "Start Date" & dtmStart
dtmFinish=DateAdd("d",7,dtmStart)
WScript.Echo "End Date" & dtmFinish

“We waste time looking for the perfect lover, instead of creating the perfect love” ~ Tom Robbins

Related:

Date - The current system date
DateDiff - Return the time interval between two dates
DatePart - Return a unit of time from a date
DateSerial - Return a Date from a numeric Year, Month and Day
Weekday - Return the day of the week
Q218964 - VBScript Date and Time formats change with logged on user
Equivalent in Powershell - Date.AddDays(-7)