>>>Scanning the .NET help files, help for the Convert.ToDateTime Method (Int64) returns the following information:
>>>
>>>"This conversion is not supported..."
>>>
>>>What's up with this?
>>>
>>>Specifically, I am writing a VB.NET routine that is querying Active Directory. First of all, I can't understand why the following AD fields are of data type Long:
>>>    badpasswordTime
>>>    pwdlastset
>>>    usncreated
>>>    accountexpires
>>>    lastlogoff
>>>    usnchanged
>>>
>>>...while the following fields are of data type Date:
>>>    whencreated
>>>    whenchanged
>>>
>>>They should all be date-time values shouldn't they?
>>>
>>>It wouldn't be a problem if the routine mentioned in the subject of this email were available, but it's not. How would one go about converting one of these 64-bit signed integer values to its equivalent DateTime format value (using VB.NET)?
>>>
>>>Thanks in advance!
>>
>>Kile,
>>
>>This might get you started: http://www.dotnet247.com/247reference/msgs/19/96138.aspx
>
>Thanks Keith,
>
>I actually found this article right after I posted my first message. But I've struggled to make it work for me. The example is in C#, and though I've been pretty successfull porting other C# snippets to VB, I had no luck with with this one.
>
>The thing I'm stuck on is the LargeInteger cast. It's not available to me. I've tried to add the activeds.dll as a reference to my project, thinking it would provide the library I'm looking for. It wouldn't even let me add it as a reference.
>
>I currently have the System.DirectoryServices as a reference, but it's not providing the LargeInteger cast either.
>
>Perhaps I need to create my own LargeInteger class:
>
>Public Class LargeInteger
>   Dim mHighPart As Long
>   Dim mLowPart As Long
>
>   Public Property HighPart()
>     Get
>       Return mHighPart
>     End Get
>     Set(ByVal Value)
>       mHighPart = Value
>     End Set
>   End Property
>
>   Public Property LowPart()
>     Get
>       Return mLowPart
>     End Get
>     Set(ByVal Value)
>       mLowPart = Value
>     End Set
>   End Property
>...
>End Class
>
>But then, I'd have to be able to pull the high and low parts out of the original value to populate my class, and that's what I'm having trouble with in the first place - so this is putting the cart before the horse, so to speak.
>
>I'm still struggling to understand why Microsoft would have provided dates in this Long Integer format, when at the same time, they already provide other datetime fields in the date format...?!? Seems to me like they had two different teams working on the Active Directory properties and one of them thought they'd be funny... *sigh*

Kile,

Extracting the high and low integers is should simply be a matter of dividing by 2^32 for the high part and taking the modulo of 2^32 for the low part. Or you can can use bitwise operators to be more efficient :)