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AuthenticablePrincipal.LastLogon Property

.NET Framework 4

Gets the Nullable DateTime that specifies the date and time of the last logon for this account.

Namespace:  System.DirectoryServices.AccountManagement
Assembly:  System.DirectoryServices.AccountManagement (in System.DirectoryServices.AccountManagement.dll)
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public Nullable<DateTime> LastLogon { get; }

Property Value

Type: System.Nullable<DateTime>
A Nullable DateTime that specifies the date and time of the last logon for this account.
Exception Condition
InvalidOperationException

The underlying store does not support this property.

As with all DateTime properties in System.DirectoryServices.AccountManagement, the time returned is in UTC form. To convert it to local time, call the ToLocalTime method on the return object.

.NET Framework

Supported in: 4, 3.5

.NET Framework Client Profile

Supported in: 4

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
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Please do not expect this value to be accurate
I cannot read the code of this getter using the free version 6 of the Reflector tool.  However, I've spent some time on this recently and this values seems to be the "lastLogonTimeStamp" value that Active Directory replicates across all domain controllers.  The bad news is that Active Directory does replicate the value only about each 14 days.
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