Can you please tell me why one of these lines of code works and the other does not?

I am passing an ADUser object with LastLogonTimeStamp property added, to the DateTime Parse method. If I pass it directly, if errors, saying the 'input string was not in correct format'. If I use a ForEach 'loop' (even though in this test case, I am only passing one object not a collection of them--but I will be doing that), the method performs as expected.

In both cases I'm passing the same object, with same property value referenced. Works:

get-aduser user001 -property lastlogontimestamp | foreach {Get-Date Date ([DateTime]::FromFileTime([Int64]::Parse($_.LastLogonTimeStamp)))}

Sunday, August 16, 2015 8:01:27 PM

Fails:

get-aduser 9aubyt001 -property lastlogontimestamp | Get-Date Date ([DateTime]::FromFileTime([Int64]::Parse($_.LastLogonTimeStamp)))

Exception calling "Parse" with "1" argument(s): "Input string was not in a correct format."At line:1 char:1

Can you please tell me why one of these lines of code works and the other does not?

I am passing an ADUser object with LastLogonTimeStamp property added, to the DateTime Parse method. If I pass it directly, if errors, saying the 'input string was not in correct format'. If I use a ForEach 'loop' (even though in this test case, I am only passing one object not a collection of them--but I will be doing that), the method performs as expected.

In both cases I'm passing the same object, with same property value referenced. Works:

get-aduser user001 -property lastlogontimestamp | foreach {Get-Date Date ([DateTime]::FromFileTime([Int64]::Parse($_.LastLogonTimeStamp)))}

Sunday, August 16, 2015 8:01:27 PM

Fails:

get-aduser 9aubyt001 -property lastlogontimestamp | Get-Date Date ([DateTime]::FromFileTime([Int64]::Parse($_.LastLogonTimeStamp)))

Exception calling "Parse" with "1" argument(s): "Input string was not in a correct format."At line:1 char:1

Thanks.

• Edited by Noah Sparks 16 hours 39 minutes ago

We normally don't use that property because AD gives us the converted property..

Get-AdUser user001 -property LastLogonDate | select LastLogonDate

• Edited by Noah Sparks Monday, August 24, 2015 2:30 PM

Thanks jrv (Danny and Noah). I thought, dang, I keep asking questions about outdated methods, props, etc.. So I looked up LastLogonDate and sure enough. By the way, the converted property isn't a value AD provides, but Powershell, which is what I think you meant to say.

"Powershell was nice enough to give us a third option to query by.  LastLogonDate is a converted version of LastLogontimestamp.  Its not a [AD] replicated attribute.  Instead, its a locally calculated value of the replicated value.  Most importantly, it gives us the ability to query using human friendly date formats!!"

http://social.technet.microsoft.com/wiki/contents/articles/22461.understanding-the-ad-account-attributes-lastlogon-lastlogontimestamp-and-lastlogondate.aspx

Gotta love the goog!

Well I thought I could get away with it.  Too lazy to change what I typed.  Good call for catching.

Yes- PowerShell adds to most things in useful