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Error for DateAdd formula on blank date field

Posted on 2014-11-22
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Last Modified: 2014-11-22
=IIf(IsError(DateAdd("d",30,[Text44])),"",DateAdd("d",30,[Text44]))

When the above formula is evaluated for a Text44 textbox  with a "" value, I get an error as the output for the second text box.

What can I do make the formula output a blank value?

Thanks

Glen
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Question by:GPSPOW
5 Comments
 
LVL 18

Assisted Solution

by:Simon
Simon earned 100 total points
ID: 40460035
The problem is that IIF evaluates both parts, even though it only returns a value for one of them.

This is a problem when using calculated controls. I tend to use event handlers that fire after controls are modified to set dependent fields. In this case I'd check that the value in Text44 is a date and only then calculate and populate the dependent field.
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LVL 120

Assisted Solution

by:Rey Obrero (Capricorn1)
Rey Obrero (Capricorn1) earned 100 total points
ID: 40460041
try

= IIf([Text44] & "" = "", "", DateAdd("d", 30, [Text44]))
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LVL 47

Accepted Solution

by:
Dale Fye (Access MVP) earned 300 total points
ID: 40460049
Or you could create a function:
Public Function DateAddPlus(Interval as string, Incr as Double, SomeDate as Variant) as Variant

    IF Len(Trim(SomeDate & " ")) = 0 Then
        DateAddPlus = ""
    Else
        DateAddPlus = DateAdd(Interval, Incr, SomeDate)
    End If

End Function

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The advantage of using a function is that the function will be evaluated when you go to a new record and when you make a change in the the first date control.  The syntax you would use to call this function within your Control Source would be something like:

=DateAddPlus("d",30,[Forms]![YourFormName].[text44])
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Author Closing Comment

by:GPSPOW
ID: 40460056
Thanks to all who gave me the good recommendations.

Glen
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LVL 18

Expert Comment

by:Simon
ID: 40460057
I just knocked up a quick test. If the input date field is blank, a simple =DateAdd() calculated field stays blank until a valid date is entered into the input date field. My test used a bound date field to as the input date field. If using unbound fields, using an input mask or validation rule would prevent any non-date values being entered.
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