Gets the last instant in time at which this security token is valid.
Assembly: System.IdentityModel (in System.IdentityModel.dll)
Use the ValidFrom and properties to determine the time period in which a GenericXmlSecurityToken token is valid. The ValidFrom and properties represent the first and last instants in time in which the security token is valid, respectively.
The property is specified using the expirationTime parameter of the constructor. The value returned from this property is always in Coordinated Universal Time (UTC).
Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.