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Adding and Subtracting Dates

Posted on 2009-05-13
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Last Modified: 2012-05-06
Hi Experts.   I have a bit of code that I'm taking from and old classic ASP/ VB Script page and trying to implement in a VB.NET/ASP.NET web application and I'm getting this error.

Operator '-' is not defined for type 'Date' and type 'Integer'.

The error is pointing to the 'If' statement.

My Code ( In the attached snippet)  works perfectly in Classic ASP/VB Script but .NET doesn't like it.  

All I want to do is add and or subtract days from the date value returned from my database.

What do I need to do in order to make this code function in .NET?
If reader.HasRows Then
                While reader.Read()
                    If ((reader("EventStartDate") - 6) <= StartDate And StartDate <= (reader("EventEndDate") + 6)) _
                    Or ((reader("EventStartDate") - 6) <= EndDate And EndDate <= (reader("EventEndDate") + 6)) _
                    Or (StartDate <= (reader("EventStartDate") - 6) And EndDate >= (reader("EventStartDate") - 6)) Then
                        intQuantityOut += reader("QuantityOrdered")
                    End If
                End While
 
                Return intQuantityOut
 
            Else
                Return 0
            End If

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Question by:cdemott33
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3 Comments
 
LVL 10

Expert Comment

by:MaxOvrdrv2
ID: 24375082
you need to use DateAdd() function...

DateAdd(interval,number,date)

Parameter Description
interval Required. The interval you want to add
Can take the following values:

yyyy - Year
q - Quarter
m - Month
y - Day of year
d - Day
w - Weekday
ww - Week of year
h - Hour
n - Minute
s - Second
 
number Required. The number of interval you want to add. Can either be positive, for dates in the future, or negative, for dates in the past

date Required. Variant or literal representing the date to which interval is added
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Accepted Solution

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MaxOvrdrv2 earned 2000 total points
ID: 24375163

If ( DateAdd("d",-6,CDate(reader("EventStartDate"))) <= StartDate And StartDate <= DateAdd("d",6,CDate(reader("EventEndDate"))) ) _

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Author Closing Comment

by:cdemott33
ID: 31580997
Thank you VERY much.  Worked perfectly!
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