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Filter VB.NET AD request by whenCreated

Posted on 2009-07-06
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Last Modified: 2012-05-07
I have program that will allow some end-users to export some data from AD.  The problem I am running into is with my search code for the "whenCreate" field.  I am trying to export last 7 Days, 14 Days, and 30 Days worth of data, but just cant seem to get it to work.
mySearcher.Filter = "(&(objectClass=User)(whenCreated=Today.Now - 7))"
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Question by:james_martin
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LVL 70

Expert Comment

by:Chris Dent
ID: 24785316

Hey,

The date you use must be in Universal Time format:

yyyymmddhhnnss.0Z

Perhaps like this (but there may well be much more efficient ways):

        Dim dateString As String = Date.Now.ToString("u")
        Dim RegExp As New Regex("-|:| ")
        dateString = RegExp.Replace(dateString, "")
        dateString = dateString.Replace("Z", ".0Z")
        Console.WriteLine(dateString)

You're also unlikely to get an exact match on that, many many seconds in the day and you'd have to be down to that. So this...

"(&(objectClass=User)(whenCreated>=" & dateString & "))"

Or this:

"(&(objectClass=User)(whenCreated<=" & dateString & "))"

Chris
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LVL 7

Expert Comment

by:Mohed Sharfi
ID: 24785334
Hi james_martin,
please try this code(snippet)
thanks
 mySearcher.Filter = "(&(objectCategory=user)(whencreated>=Today.Now - 7))"

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Author Comment

by:james_martin
ID: 24785389
Chris,
This declaration "Dim RegExp As New Regex("-|:| ")" is giving me an issue; "Regex" is back as not defined, how should I define it?

Thanks.
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LVL 70

Expert Comment

by:Chris Dent
ID: 24785404

Sorry... Needs the namespace importing:

Imports System.Text.RegularExpressions

Otherwise it won't like it :)

Chris
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LVL 70

Expert Comment

by:Chris Dent
ID: 24785420

Oh and I forgot the -7 days part, it'll need adding back in. Got distracted ;)

Chris
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LVL 70

Expert Comment

by:Chris Dent
ID: 24785634

And I neglected to put in the "how to find a days worth" bit. Have the code generate something like this:

(&(objectClass=User)(whenCreated>=20090623000000.0Z)(whenCreated<=20090624000000.0Z))

Then you get those in the specified range :)

Chris
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Author Comment

by:james_martin
ID: 24785725
Chris,
Is this the correct use?
mySearcher.Filter = "(&(objectClass=User)(whenCreated<=" & dateString(-7) & "))"
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Author Comment

by:james_martin
ID: 24785728
sorry it reformatted it.

mySearcher.Filter = "(&(objectClass=User)(whenCreated<=" & dateString(-7) & "))"

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Expert Comment

by:Chris Dent
ID: 24785739

Not if you used mine above, dateString is a String so can't use date functions on it any more. The -7 needs to be done to the date prior to converting to a universal date string (.ToString("u")).

Chris
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Accepted Solution

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Chris Dent earned 500 total points
ID: 24785817

Lets see... given my limited knowledge of actual programming... I would do something like the below (just a little console app built to test this code).

Chris
Imports System.DateTime
Imports System.Text.RegularExpressions
 
Module Module1
    Function DateToUniversalDateString(ByVal dtmDate As Date)
        Dim strDate As String = dtmDate.ToString("u")
        Dim RegExp As New Regex("-|:| ")
        strDate = RegExp.Replace(strDate, "")
        strDate = strDate.Replace("Z", ".0Z")
        DateToUniversalDateString = strDate
    End Function
 
    Sub Main()
        Dim dtmStartDate As Date = Today.AddDays(-7)
        Dim dtmEndDate As Date = Today.AddDays(-6)
 
        Dim strLdapFilter As String = _
          "(&(objectClass=user)(objectCategory=person)(whenCreated>=" & _
          DateToUniversalDateString(dtmStartDate) & ")(whenCreated<=" & _
          DateToUniversalDateString(dtmEndDate) & "))"
 
        Console.WriteLine(strLdapFilter)
    End Sub
 
End Module

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Author Closing Comment

by:james_martin
ID: 31600157
Limited knowledge huh????  Well you rock and thanks very much!
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