Internet Direct (Indy) Version 9.0.1 Beta
TIdX509.notBefore
Initial validity date and time for the X.509 certificate.

property notBefore: TDateTime;
Description
notBefore is a read-only TDateTime property that represents the initial validity date and time for the X.509 certificate. notBefore will contain 0.0 when the instance does not represent a valid X.509 certificate. notBefore is expressed in UTC (Universal Time Coordinates).