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Compare Dates

Posted on 2011-09-15
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Last Modified: 2012-05-12
Hi Experts:

The problem that I am running into is: I'm comparing two dates and if the date field (NEWWE) is less than PASTWE date plus thirteen weeks it should display the NEWWE date else display zero.  It is working for the most part but a NEWWE date of 09/18/2011 < 12/11/2011 is returning a value of 0 when it should return the NEWWE value.  The following is the Iif statement I'm using.

IIf([NewWe]<DateAdd("ww",13,[PASTWE]),[NewWe],0)

What am I doing wrong?  Thanks!
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Question by:CompTech810
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Cluskitt earned 500 total points
ID: 36543162
That is because it's treating your dates as strings. Use CDate():

IIf(CDate([NewWe])<DateAdd("ww",13,CDate([PASTWE])),CDate([NewWe]),0)
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by:CompTech810
ID: 36543179
Ahh...  That worked with the exception of the '0' displays as: 12/30/1899
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Expert Comment

by:Cluskitt
ID: 36543220
Yes. A date with the value of 0 is that. You can, however, simply remove the last CDate. You only need it to compare. Afterwards, you can return it as a string. If you need the value as a date later, you can always use CDate then.
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Author Comment

by:CompTech810
ID: 36543608
Great that worked.

I do have an additional question.  In the criteria of the query that we just did I only want to display dates that are greater than zero.  When I use the criteria to only include records greater than zero it prompts me for NEWWE.

>0
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Expert Comment

by:Cluskitt
ID: 36543663
Well, without looking at your file, it's hard to know what went wrong. You can have a look at the SQL to see if anything is amiss. Without knowing what you did, I can't really help you. But if you just add:
>0
in the criteria field, I don't see a reason why it shouldn't work.
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by:CompTech810
ID: 36544797
I'm not sure either.  Is there a way to run debug to check what access is doing?
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by:CompTech810
ID: 36545728
I submitted a question with the criteria issue.  I have tried everything I can think of.

Thanks for your help!
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Expert Comment

by:Cluskitt
ID: 36547836
Glad to help. As for the debug part, you can't really debug SQL. What you can do is check the SQL query (I assume you were doing this in the graphic structure window). Then you, or someone here, can assist you with it.
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by:CompTech810
ID: 36548497
Thanks!!
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