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 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)