Gets the first instant in time at which this security token is valid.
Assembly: System.IdentityModel (in System.IdentityModel.dll)
Use the and ValidTo properties to determine the time period in which a SamlSecurityToken token is valid. The and ValidTo properties represent the first and last instants in time in which the security token is valid, respectively.
By default, a 5-minute clock skew is allowed between the sender and receiver of the security token. So, if the NotBefore property is set to 1:00 PM, then the property is set to 12:55 PM.
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.